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The origin of dust in galaxies revisited: the mechanism determining dust content
Earth, Planets and Space volume 63, Article number: 2 (2012)
The origin of cosmic dust is a fundamental issue in planetary science. This paper revisits the origin of dust in galaxies, in particular, in the Milky Way, by using a chemical evolution model of a galaxy composed of stars, interstellar medium, metals (elements heavier than helium), and dust. We start from a review of time-evolutionary equations of the four components, and then, we present simple recipes for the stellar remnant mass and yields of metal and dust based on models of stellar nucleosynthesis and dust formation. After calibrating some model parameters with the data from the solar neighborhood, we have confirmed a shortage of the stellar-dust-production rate relative to the dust-destruction rate by supernovae if the destruction efficiency suggested by theoretical works is correct. If the dust-mass growth by material accretion in molecular clouds is active, the observed dust amount in the solar neighborhood is reproduced. We present a clear analytic explanation of the mechanism for determining dust content in galaxies after the activation of accretion growth: a balance between accretion growth and supernova destruction. Thus, the dust content is independent of the uncertainty of the stellar dust yield after the growth activation. The timing of the activation is determined by a critical metal mass fraction which depends on the growth and destruction efficiencies. The solar system formation seems to have occurred well after the activation and plenty of dust would have existed in the proto-solar nebula.
Cosmic dust grains are negligible in mass in the Universe. Nevertheless, they play a significant role in many astronomical, astrophysical, and astrochemical aspects: extinction (absorption and scattering) matter of radiation, an emission source in infrared wavelengths, a coolant and a heat source in the interstellar medium (ISM) and intergalactic medium (IGM), and a site for the formation of molecules. Therefore, dust is one of the most important constituents of the Universe. Dust is also important for planetary science because grains are material for planets.
Dust grains are formed in rapidly-cooling gas of stellar outflows (Draine and Salpeter, 1977; Yamamoto and Hasegawa, 1977). We call such grains ‘stardust’. Sources of the stardust are asymptotic giant branch (AGB) stars, su-pernovae (SNe), red supergiants, novae, Wolf-Rayet stars, and so on (e.g., Gehrz, 1989). The main source of the star-dust in the present Milky Way and the Magellanic Clouds is thought to be AGB stars (Gehrz, 1989; Draine, 2009; Matsuura et al., 2009).
SNe may also produce a significant amount of stardust (Kozasa and Hasegawa, 1987; Todini and Ferrara, 2001; Nozawa et al., 2003, 2007; Schneider et al., 2004; see also Kozasa et al., 2009). Stardust from SNe was particularly important in the early Universe because the time for stars to evolve to the AGB phase is typically about 1 Gyr, but the cosmic time in the early Universe is less than this (Morgan and Edmunds, 2003; Maiolino et al., 2004; Dwek et al., 2007; but see also Valiante et al., 2009). The ‘first’ star-dust may have also played an important role in changing the mode of star formation from massive-star dominated to present-day Sun-like-star dominated (Schneider et al., 2003, 2006).
However, dust formation by SNe remains observation-ally controversial. The first detections of a few M⊙ dust freshly formed, which is much larger than expected, in Cassiopeia A (Cas A) and Kepler SN remnants (SNRs) by submillimeter observations with SCUBA (Dunne et al, 2003; Morgan et al., 2003) were almost contaminated by foreground dust in the ISM on the sight-lines (Krause et al, 2004; Gomez et al, 2009). Recent infrared observations with the Spiter Space Telescope and AKARI and sub-millimeter observations with Herschel and BLAST of Cas A and other SNRs are in agreement with theoretical expectations of 0.01–0.1 M⊙ per one SN (Rho et al, 2008; Sakon et al., 2009; Nozawa et al, 2010; Barlow et al, 2010; Sibthorpe et al, 2010).
Once stardust grains are injected into the ISM, they are processed there. The grains in hot gas are bombarded by thermally-moving protons and sputtered (Onaka and Kamijo, 1978; Draine and Salpeter, 1979). SN shockwaves probably destroy dust grains by grain-grain collisional shattering as well as sputtering (e.g., Dwek and Arendt, 1992; Jones et al, 1994, 1996; Nozawa et al, 2006; Silvia et al, 2010). This destruction process is widely accepted and observational evidence of the destruction has been found in several SNRs, especially with the Spitzer Space Telescope (Arendt et al, 1991,2010; Borkowski et al, 2006; Williams et al., 2006; Dwek et al, 2008; Sankrit et al., 2010; but see Mouri and Taniguchi, 2000).
Assuming the destruction efficiency predicted theoretically, the life-time of dust grains is found to be of the order of 100 Myr (McKee, 1989; Draine, 1990; Jones et al., 1994, 1996). On the other hand, the injection time of stardust is of the order of 1 Gyr (e.g., Gehrz, 1989). Thus, another efficient channel of dust formation is required to maintain dust content in galaxies. The most plausible mechanism is accretion growth in the ISM (Draine, 1990, 2009); in dense molecular clouds, atoms and molecules of some refractory elements and compounds accrete onto pre-existing grains and may change from the gas phase to the solid phase. Note that, unlike the sticking growth of grains well studied in protoplanetary disks, this accretion growth causes an increase in dust mass. This type of growth is favored to explain the observed depletions of some elements in the gas phase of the ISM relative to solar abundance. The correlation between the degree of depletion and the density in the ISM particularly suggests this process (e.g., Savage and Sembach, 1996; Jenkins, 2009). It is also suggested that an efficient growth is required to explain the massive dust mass observed in the early Universe (Michalowski et al., 2010).
Since the pioneering work by Dwek and Scalo (1980), much theoretical work on dust-content evolution in galaxies has been carried out (Dwek, 1998; Edmunds and Eales, 1998; Lisenfeld and Ferrara, 1998; Hirashita, 1999a, b, c; Hirashita et al., 2002; Edmunds, 2003; Inoue, 2003; Morgan and Edmunds, 2003; Dwek et al., 2007; Calura et al., 2008; Zhukovska et al, 2008; Valiante et al., 2009; Asano et al., 2011; Dwek and Cherchneff, 2011; Gall et al, 2011a, b; Mattsson, 2011; Pipino et al, 2011). These works are based on the evolutionary model of elemental abundance in galaxies called the chemical evolution model (Tinsley, 1980 for a review) and incorporate some (or all) of the three processes of formation, destruction, and growth of dust. One of the main results from recent works is the importance of accretion growth.
This paper presents a new interpretation of the mechanism for determining dust content in galaxies. Previous works imply that the mechanism is a balance between dust destruction by SNe and accretion growth in the ISM. However, to date, this point has not been discussed clearly. This paper analytically justifies this implication. For this aim, a simple one-zone model is sufficient. In addition, we present new simple recipes describing stellar remnant mass and yields of elements and dust from state-of-the-art models of stellar nucleosynthesis and the formation of stardust.
Section 2 presents a review of the basic equations. In Section 3, we present new simple recipes of stellar remnant mass and yields. In Section 4, we calibrate some model parameters to reproduce the observed properties of the solar neighborhood. Section 5 presents our analytical interpretation of the mechanism for determining dust content in galaxies, and further discussions are presented in Section 6. Experts in this field may go straight to Section 5 which is the new result of this paper.
Throughout this paper, we call elements heavier than helium ‘metal’ according to the custom of astronomy. We adopt the metal mass fraction (so-called metallicity) in the Sun of Z⊙ = 0.02 (Anders and Grevesse, 1989) conventionally, although recent measurements suggest a smaller value of 0.0134 (Asplund et al., 2009).
2. Chemical and Dust Evolution Model of Galaxies
2.1 Equations of chemical and dust amount evolution
We deal with a galaxy composed of stars (including their remnants; i.e. white dwarfs, neutron stars, and black-holes) and the ISM. For simplicity, we assume the ISM to be one-zone. The ISM contains metal and dust as internal components. If we denote the masses of these components as M*. (stars (and remnants)), Mism (ISM), M Z (metal), and M d (dust), the equations describing their time evolutions are (e.g., Dwek, 1998)
where S is the star-formation rate, R is the mass-return rate from dying stars, Y Z and Y d are the metal- and dust-supplying rate ‘yields’ by dying stars, respectively. Z ≡ M z /Mism is the metal-mass fraction in the ISM called ‘metallicity’, and Z d = Md/Mism is the dust-mass fraction in the ISM which we call the dust-to-gas mass ratio. Note that Mism < M Z ≥ M d .
I, I Z , and Id are the ISM, metal, and dust infall rates from the IGM, respectively. O, O Z , and Od are the ISM, metal, and dust outflow rates to the IGM, respectively. In this paper, we do not consider any outflows (O = O Z = Od = 0), but consider only an ISM infall I (no metal and dust in the infalling gas: I Z = Id = 0), which is required to reproduce the metallicity distribution of stars nearby the Sun. 1 Footnote 1 The reason why we omit any outflows is that we do not know the transport mechanism of metal and dust from galaxies to the IGM (e.g., Bianchi and Ferrara, 2005). However, this omission may be inconsistent with detections of metal and dust in the IGM (e.g., Songaila and Cowie, 1996; Menard et al., 2010). 2 Footnote 2
In the dust mass equation (Eq. (4)), there are two additional terms; Dsn is the dust-destruction rate by SNe and Gac is the dust-growth rate in the ISM by metal accretion. These two terms are discussed in Section 2.5 and Section 2.6 in detail.
2.2 Star formation and infall rates
We adopt a simple recipe for star formation introduced by Schmidt (1959): (Schmidt law). The index p, called the Schmidt index, is observationally indicated to be p = 1–2 (e.g., Kennicutt, 1998; Elmegreen, 2011) and some theoretical interpretations for the value have been presented (e.g., Dopita and Ryder, 1996). However, the value and its origin of the index is still an open problem (Elmegreen, 2011 and references therein). Fortunately, the choice of the index is not important, in fact, because in Section 4 we calibrate other model parameters so as to reproduce the observed star-formation history S(t) in the solar neighborhood, which is essential. We here assume p = 1 in order to solve the equations analytically in Section 5. In this case, we need a time-scale to give the star-formation rate: star-formation time-scale, τsf (see Table 1 in Section 4 for the values). Thus, the star-formation rate is given by
The infall from the IGM mimics the structure formation in the Universe based on the hierarchical scenario with cold dark-matter (e.g., Peacock, 1999); small galaxies are first formed at density peaks of the dark matter distribution in the Universe and they become larger and larger as they merge with each other and also obtain mass by an accretion process. Here, we simply assume a smooth exponential infall rate although the mass assembly of a galaxy is intrinsically episodic due to the merging process. This simplification is a kind of ensemble average of many galaxies and is appropriate when considering a mean property of galaxies. The infall rate which we adopt is
where τin is the infall time-scale and Mtotal is the total mass which a galaxy obtains within the infinite time (see Table 1 in Section 4 for the values). Note that Mtotal just gives the normalization of mass of a galaxy.
2.3 Stellar mass spectrum and returned mass rate
Salpeter (1955) first investigated the mass spectrum of stars in the solar neighborhood, corrected it for modulation by stellar evolution and death, and obtained the mass spectrum of stars when they are born, called the initial mass function (IMF) of stars. Salpeter’s IMF is a power-law: dN/dm = ϕ(m) ∝ m−q with q = 2.35. A lot of ensuring research, confirmed that the slope was quite universal, especially for massive stars, although there was a cut-off mass for low-mass stars (e.g., Kroupa, 2002; Chabrier, 2003 for reviews). We adopt here a simple functional form proposed by Larson (1998) which is essentially equivalent to the IMFs by Kroupa (2002) and Chabrier (2003) as
with a cut-off mass m c and the range from m low to mup. As a standard case, we adopt p = 2.35, m c = 0.2 M⊙, mlow = 0.1 M⊙, and mup = 100M⊙. The cut-off mass well matches with the observed data compiled by Kroupa (2002). We normalize the IMF as .
The mass-returned rate from dying stars, R, is given by
is the time at which stars with mass m dying at time t are born, τ1f(m) is the stellar life-time, w(m, Z) is the remnant mass of stars with mass m and metallicity Z, and m1f (t) is the minimum mass of stars dying at time t. This is the inverse function of t = τ1f(m). If time t is less than the lifetime of the star with mup, the returned rate R = 0. We have assumed that the metallicity of a star is the same as the ISM metallicity at the time when the star is born.
The stellar life-time τ1f(m) is calculated by the formula of Raiteri et al. (1996) which is a fitting function of Padova stellar evolutionary tracks (Bertelli et al., 1994). This formula is a function of stellar mass m and metallicity Z. However, the Z-dependence is weak. Thus, we neglect it (we always set Z = Z⊙ in the formula).
2.4 Stellar yields of ‘metal‘ and dust
When stars die, they eject a substantial mass of metal and dust into the ISM. The term driving the time evolution of metal mass given by Eq. (3) is the metal-supplying rate, Y Z , called metal yield. Using the IMF, ϕ(m), and the star-formation rate, S(t), we can express the metal yield as
where m Z is the metal mass ejected from a star with mass m and metallicity Z, and t′ is given by Eq. (9).
The dust-supplying rate, Y d , called the dust yield can be expressed likewise:
where md is the dust mass ejected from a star with mass m and metallicity Z, and t′ is given by Eq. (9).
2.5 Dust destruction by supernova blast waves
Dust grains are destroyed by SN shock waves due to shattering and sputtering (e.g., Dwek and Arendt, 1992). This dust destruction is observed in some SNRs as described in Section 1. In this paper, we adopt the dust-destruction rate by SNe proposed by Dwek and Scalo (1980) and McKee (1989):
where the destruction time-scale τsn is defined as the time-scale during which all the ISM is swept by ‘dust destructive’ shock waves:
where Rsn is the SN-occurrence rate, msn is the mass swept by a single SN, and ϵ is the efficiency of the dust destruction. The SN-occurrence rate is given by
where we have assumed the mass range for SNe to be 8– 40 M⊙ (Heger et al, 2003) and t′ is given by Eq. (9). If t < τ1f(40M⊙), Rsn = 0. Note that we consider only Type II SNe and neglect Type Ia SNe. The reason is discussed in Section 3.
The effective mass swept by a dust-destructive shock wave, ϵmsn is the important parameter. It is estimated to be ~ 1000 M⊙, namely ϵ ~ 0.1 and msn ~ 104M2299; (McKee, 1989; Nozawa et al., 2006). Recent models for starburst galaxies in the early Universe often assume an effective mass of ϵmsn ~ 100 M⊙ which is a factor of 10 smaller than our fiducial value (Dwek et al, 2007; Pipino et al, 2011; Gall et al, 2011a). Their argument is that starburst activity produces multiple SNe which make the ISM highly inhomogeneous and the dust-destruction efficiency decreases in such a medium. However, the solar neighborhood is not the case, and, thus, we keep ϵmsn ~ 1000 M⊙.
2.6 Dust growth by ‘metal’ accretion in the ISM
In the ISM, atoms of some refractory elements (or refractory molecules) may accrete onto a dust grain and may become a part of the grain. We call this process the accretion growth of dust in the ISM (Draine, 1990). Note that this process does not need nucleation, and thus, can occur even in the ISM. A simple estimate of the growth rate is (e.g., Hirashita, 2000)
where XcoldNd is the number of dust grains in cold dense clouds, a is the grain radius, s Z is the sticking probability of accreting metals (atoms or molecules), v Z is the thermal velocity of the accreting metals and is the mass density of the accreting metals in the gas-phase. Note that all the quantities except for XcoldNd in Eq. (15) are typical (or effective) values averaged over various grain radii, elements, and ISM phases. The gas-phase metal density is reduced to , where is an effective ISM mass density. We define it as a mass-weighted average density of various ISM phases, and, then, it is determined by the density of dense molecular clouds where the dust growth occurs. Note that δ = Md/M Z , the dust-to-metal mass ratio (the dust-depletion factor is 1 — δ). For spherical grains, Nd = 3Md/(4πa3σ), where σ is the typical material density of grains.
Equation (15) can be reduced to
The accretion growth time-scale τac is
where the normalization τac,0 is the parameter determining the process:
This time-scale is very uncertain, but we will obtain τac,0 = 3 × 106 yr as the fiducial value in Section 4.2 in order to reproduce the dust-to-metal ratio in the solar neighborhood with an SN destruction efficiency of ϵmsn = 1000 M⊙. This value can be obtained with a set of parameters of a = 0.1 μm (typical size in the ISM of the Milky Way), σ = 3 g cm−3 (compact silicates), sZ = 1, vZ = 0.2 km s−1 (56 Fe as an accreting metal atom and thermal temperature of 100 K), , and Xcold = 0.2. This data set is just an example, but ensures that the time-scale is not outrageous.
There is a discussion that the lifetime of dense clouds (or the recycling time-scale of dense gas) should be longer than the accretion growth time-scale for an efficient dust growth (Zhukovska et al., 2008; Dwek and Cherchneff, 2011). According to these authors, the lifetime is long enough to realize an efficient dust growth in the Milky Way and even in starburst in the early Universe. Another issue is the effect of grain-size distribution which is discussed in Hirashita (2011).
3. Stellar Remnant and ‘Metal’ and Dust Yields
In this section, we present new simple formulas to describe the stellar remnant mass and yields of metal and dust which are useful to input into the chemical evolution codes. We represent all elements heavier than helium as just a ‘metal’ in the formulas for simplicity, while yields of various elements are presented in the literature. We consider three types of stellar death: white dwarfs through the AGB phase, core-collapse Type II SNe, and a direct collapse leading to a black-hole called a ‘collapser’ (Heger et al., 2003). In this paper, we assume the mass range for the SNe to be 8–40 M⊙ (Heger et al., 2003). The stars with a mass below or above this mass range become AGB stars, or ‘collapsers’, respectively.
We neglect Type Ia SNe for simplicity. This population of SNe is the major source of the element iron (Iwamoto et al, 1999) and may be the source of iron dust (Calura et al., 2008). However, in respect of the total stardust mass budget, the contribution of SNe Ia relative to SNe II is always less than 1–10% (Zhukovska et al., 2008; Pipino et al., 2011). Since we are dealing with metal and dust each as a single component, we can safely neglect the contribution of SNe Ia.
The remnant mass, w(m, Z), is taken from model calculations of AGB stars (Karakas, 2010) and SNe (Nomoto et al, 2006). Figure 1 shows the remnant mass fraction relative to the initial stellar mass, w/m. This depends on the metallicity Z because Z in the stellar atmosphere determines the radiation pressure through opacity and the strength of the stellar wind in the course of the stellar evolution, and affects the remnant mass. However, as shown in Fig. 1, the dependence is weak, so we neglect it. We obtain the following fitting formula:
which is shown by the solid line in Fig. 1. This fitting formula agrees with the values in Table 1 of Morgan and Edmunds (2003) within a <20% difference, except for the case m = 9 M⊙ for which our estimate is a factor of 2 lower than that of Morgan and Edmunds (2003).
For the metal yield, mZ, we adopt the data taken from model calculations of AGBs (Karakas, 2010) and SNe (Nomoto et al, 2006). Figure 2 shows m Z relative to the initial stellar mass m as a function of m. While the expected m Z depends on the mass m and metallicity Z in a complex way, we approximate the data with a simple power-law of only m as
When the normalization f Z = 0.02, Eq. (20) is the solid line in Fig. 2. As shown in the figure, the uncertainty of Eq. (20) is a factor of ~2. This fitting agrees with the values in Table 1 of Morgan and Edmunds (2003) within a factor of 2 difference in the SN regime. However, in the AGB regime, the difference is as large as the model results by Karakas (2010). The effect of this large uncertainty in the yield is discussed in Section 6.1.
The dust yield, md, calculated by Zhukovska et al. (2008) and Ferrarotti and Gail (2006) for AGBs and Nozawa et al. (2007) for SNe are shown in Fig. 3. These yields are theoretical ones and have not been compared with observations very much yet. As found in Fig. 3, md depends on the mass m and metallicity Z in a complex way, as does the metal yield m Z . Moreover, the dust production by SNe is further complex because the reverse shock moving in the ejecta of an SN may destroy the dust produced in the ejecta (Bianchi and Schneider, 2007; Nozawa et al., 2007; Nath et al., 2008; Silvia et al., 2010). This self-destruction depends on the material strength opposing the destruction 3 Footnote 3 and the ambient gas density which determines the strength of the reverse shock. According to Nozawa et al. (2007), we plot three cases of the ambient density and ‘mixed’ and ‘unmixed’ dust productions 4 Footnote 4 in Fig. 3. We adopt a simple formula for md as
where ξ is a scaling factor and indicates the efficiency of condensation of metal elements. In Fig. 3, we show three cases of ξ = 1 (all metal condenses into dust: an extreme but unrealistic case), 0.1 (fiducial case), and 0.01 (a lower efficiency case). The reader may be anxious about the large uncertainty of this approximation. However, the dust mass in galaxies does not depend on md after accretion growth becomes active. This is because the growth of dust is the dominant process of dust production after the activation as shown later in Section 6.1.
4. Milky Way Analog
Let us calibrate the parameters in the chemical and dust evolution model of galaxies so as to reproduce the properties of the solar neighborhood in the Milky Way. There are two parameters in the chemical evolution part: the time-scales of star formation, τsf, and infall, τin. There are two additional parameters in the dust-content evolution: the time-scale of the ISM accretion growth, τac,0, and the efficiency of the dust destruction, ϵmsn. In addition, there are two parameters reflecting the uncertainties of the metal and dust yields, f Z and ξ. Table 1 is a summary of these parameters and values.
Note that we do not apply any statistical method to justify the goodness of the reproduction of the observational constraints throughout this paper because our aim is not to find the best fit solution for the constraints but to demonstrate the dust-content evolution in galaxies qualitatively. This is partly due to the weakness of the observational constraints and due to the large uncertainties of dust physics itself.
4.1 Chemical evolution at the solar neighborhood
Here, we determine the time-scales of star-formation and infall in the chemical evolution part. First, we constrain these time-scales by using the star-formation history at the solar neighborhood reported by Rocha-Pinto et al. (2000a). Such a method was adopted by Takeuchi and Hirashita (2000). Rocha-Pinto et al. (2000a) derived the star formation history from the age distribution of 552 late-type dwarf stars at the solar neighborhood. The histogram in Fig. 4 is their result and shows the very stochastic nature of the history. However, our model can treat only a smooth history. Thus, we have smoothed the stochastic history by averaging with a 4-Gyr interval. The filled circles are the result. The vertical error-bars indicate the standard error of the mean. The average history is re-normalized by the average star-formation rate for a stellar age less than 12 Gyr, which is the assumed age of the Milky Way in this paper, although this choice of the age is arbitrary. We have tried four cases of τsf in this paper: 1, 2, 3, and 5 Gyr which are the observed range of the time-scale (or gas consumption time-scale) for disk galaxies like the Milky Way (e.g., Larson et al., 1980). For each τsf, we have found τin with which we can reproduce the smoothed history as shown in Fig. 4.
Next, we adopt the observed relation between the stellar age and metallicity, the so-called age-metallicity relation, reported by Rocha-Pinto et al. (2000b), to further constrain (τsf, τin). Rocha-Pinto et al. (2000b) derived the relation from the same 552 stars as Rocha-Pinto et al. (2000a). Their result is shown in Fig. 5 by diamonds with error-bars. After comparing their result with our four model lines, we find that the (τSF/Gyr, τin/Gyr) = (5, 10) case seems the best match with the observed relation but (τSF/Gyr, τin/Gyr) = (3, 15) case is also acceptable.
Finally, we adopt another constraint: the current stellar mass relative to the ISM mass. Naab and Ostriker (2006) compiled observational constraints for the solar neighborhood. From the compilation, we adopt the ratio of the stellar mass to the ISM mass at the present epoch of 3.1±1.4. Note that the stellar mass includes the remnant mass (i.e. white dwarfs, neutron stars, and black-holes). Figure 6 shows the comparison of the ratio with our four star-formation histories. We have found that the two sets of (τSF/Gyr, τin/Gyr) = (2, 20) and (3, 15) are consistent with the data.
From these three comparisons, we finally adopt the case of (τSF/Gyr, τin/Gyr) = (3, 15) as the fiducial set for the Milky Way (or more precisely, for the solar neighborhood) in this paper.
4.2 Dust content evolution at the solar neighborhood
Here we examine the dust-content evolution. First, we show the significant effect of dust destruction and ISM growth. Figure 7 shows the time evolution of metallicity and dust-to-gas mass ratio for the fiducial set of τsf and τin obtained in the previous subsection. The model curves of the dust-to-gas ratio (dotted, dot-dashed, and solid lines) are compared with the filled circle with error-bars which is an observational estimate for the solar neighborhood. This is obtained from a metallicity Z ≈ Z⊙ (van den Bergh, 2000; see also Rocha-Pinto et al., 2000b) and dust-to-metal mass ratio δ ≈ 0.5 (Kimura et al., 2003; see below) and the uncertainty is the quadrature of uncertainties of 30% 5 Footnote 5 in Z and 20% in δ.
If there is neither destruction nor accretion growth of dust, the dust-to-gas ratio evolution is just the metallicity evolution multiplied by the condensation efficiency of star-dust, ξ, as shown by the dotted line. We have assumed ξ = 0.1 for this line. Once the SN destruction of dust is turned on with a standard efficiency as ϵmsn = 1 × 103M⊙ (McKee, 1989; Nozawa et al., 2006), the dust amount is reduced by a factor of ten as shown by the dot-dashed line. This confirms that the dust destruction is very efficient and the stardust injection is too small to compensate for the destruction (e.g., Draine, 1990; Tielens, 1998). Then we need the accretion growth in the ISM to reproduce the dust-togas ratio, ~10−2, in the present Milky Way. If we assume a time-scale of τac,0 = 3 × 106 yr, the dust-to-gas-ratio evolution becomes the solid line and reaches ≃ 10−2 which, after several Gyr, is almost two orders of magnitude larger than the case without growth.
Figure 8 shows the time evolution of τsn in Eq. (13) and τac in Eq. (17). The SN destruction time-scale τsn is almost constant promptly after the first few hundreds of Myr. On the other hand, the accretion growth time-scale τac decreases gradually in the first few Gyr. This is because τac has a metallicity dependence as shown in Eq. (17) and decreases as the metallicity increases. At a time around 4 Gyr, τac becomes shorter than τsn, and then the accretion growth becomes significant and the dust amount increases rapidly. As the accretion growth proceeds, the metal abundance in the gas phase decreases, i.e. the dust-to-metal ratio δ increases, then τac becomes almost constant and balances with τsn. We will discuss this point in Section 5 in more detail.
Figure 9 shows the time evolution of the dust-to-metal ratio, δ. The solid line is the fiducial case which is shown in Figs. 7 and 8. This can be compared with the observed ratio in the Local Interstellar Cloud reported by Kimura et al. (2003): δ = 0.5 ± 0.1. As shown in Fig. 9, the fiducial set of (τac,0, ϵmSN) = (3Myr, 1 × 103M⊙) agrees excellently with the observed data. On the other hand, other sets can also reproduce the data. For example, (τac,0, ϵmSN) = (1.5Myr, 2 × 103M⊙) or (6 Myr, 5 × 102M0). Interestingly, the δ evolutions become very similar if the product of τac,0 and ϵmSN is the same. We will also discuss this point in Section 5.
5. Determining Dust-to-Metal Ratio
In this section, we demonstrate the mechanism for determining the dust-to-metal mass ratio, δ, in galaxies. Starting from Eqs. (3) and (4), we can obtain the time-evolutionary equation of δ ≡ Md/MZ. Here, let us adopt the instantaneous recycling approximation (IRA) in which we neglect the finite stellar life-time and assume that stars with a mass larger than a certain threshold (the turn-off mass mt) die instantly when they are formed. This approximation allows us to manage the equations analytically and is good enough to see phenomena with a time-scale longer than a Gyr (see Tinsley, 1980 for more details). In the IRA, we can approximate the metal and dust yields in Eqs. (10) and (11) as YZ ≈ yZS and Yd = ξYZ ≈ ξyzS, where the effective metal yield
where we have assumed mt = 1 M⊙. This value is not sensitive to mt. We obtain yZ = 0.021(fZ/0.02) if mt = 5 M⊙. Remembering the star-formation rate S = Mism/τsf as in Eq. (5), then, we obtain
In the IRA, the SN destruction time-scale τsn in Eq. (13) can be reduced to
where the effective number of SN per unit stellar mass is
In the IRA, the metallicity Z ≡ Mz/Mism can be obtained analytically (for example, see Dwek et al., 2007). Then, we have found that Z → y Z for t → ∞ when τin > τSF. The condensation efficiency ξ is uncertain but is of the order of 0.1 (see Fig. 3). When δ is of the order of 0.1–1 as shown in Fig. 9, the ratio ξ/δ is of the order of 1 or smaller. Therefore, α is also of the order of 1 or smaller. On the other hand, nsn ~ 10−2 and ϵmsn ~ 103M⊙, then we obtain ϵmsnnsn ≫ α. Therefore, Eq. (26) is further reduced to
where α = ϵmSNnSN/τSF and b = Z/τac,0. If we assume Z to be constant (i.e. b is constant), Eq. (28) can be solved analytically. The solution is
where δ0 and δ∞ are the values for t = 0 and t → ∞, respectively. The asymptotic value δ∞ for t → ∞ is realized only when b > a, and is given by
This is the equilibrium value for Eq. (28) and we find
which excellently agrees with the results in Fig. 9.
We can fully understand the δ evolution by using Eq. (28). At the beginning, the accretion term b ~ 0 because Z ~ 0. Then, only the destruction term a is effective. As a result, δ decreases with the time-scale of 1/a = τsn. As Z increases, the accretion term b increases and finally exceeds a. Then, δ increases toward δ∞ with the evolution time-scale of 1/(b – a). This decreases as Z increases and b – a increases. Therefore, the driving force of the δ evolution is Z. If we call Z at b = a the critical metallicity, Zc, we find
When Z > Zc, the accretion growth becomes effective and δ approaches the final value δ∞. A similar critical metallicity has been derived by Asano et al. (2011) in a different way.
Equation (30) shows that the final value of δ is determined by the equilibrium between the SN destruction and the accretion growth in the ISM. The time-scale to reach equilibrium is 1/(b – a). This is relatively short in the fiducial case. For example, it is 0.3 Gyr when Z = 0.02. This means that the δ evolution proceeds with keeping the equilibrium between SN destruction and the accretion growth, or equivalently, δ = δ∞ after Z exceeds Zc. This behavior is also found by comparing the two time-scales, τsn and τac in Fig. 8; once τac becomes shorter than τsn at about 4 Gyr at which Z exceeds Zc, τac turns around and approaches τsn again. This is realized by the reduction of the term (1 − δ) in τac (see Eq. (17)) when δ increases from ~0 to δ∞. Such a kind of self-regulation process determines the dust-to-metal ratio δ.
6.1 Effect of uncertainties of yields
Here, we examine the effect of uncertainties of the normalization of metal and dust yields. As we saw in Fig. 2, our simple recipe for the metal yield may contain a factor of 2 (or more) uncertainty. The parameter f Z accounts for this uncertainty. In Fig. 10, we show the effect of f Z . As found from the panel (a), the metallicity evolution is scaled almost linearly by f Z as expected and the timing at which Z exceeds Zc = 0.5Z∙ given by Eq. (32) for the fiducial set of the accretion and destruction efficiencies becomes faster as f Z is larger. From the panels (b) and (c), we find that for each case of f Z , δ increases and τac becomes shorter than τsn soon after the timing for Z > Zc. Therefore, the timing for τac < τsn, in other words, the timing for the accretion-growth activation is well traced by Zc in Eq. (32) and this is not affected by the uncertainty in fZ. On the other hand, the timing for the activation becomes faster for larger f Z . The metallicity dependence on the final value of δ is explicit as found in Eq. (31).
Figure 11 shows the effect of the dust yield. As seen in Fig. 3, our recipe for the stardust yield has a factor of 10 or larger uncertainty because of a large uncertainty in the adopted model calculations. In Fig. 11, we show the cases with a factor of 10 larger or smaller yield than the fiducial one. Other parameters are the same as the fiducial set, so that we have the same evolutions of the metallicity and the time-scales of SN destruction and accretion growth as shown by the solid lines in Fig. 10. Before the growth activation, at around 4 Gyr, the dust amounts show a large difference; however, they converge nearly to the same amount after the activation. This is because the final value of δ given in Eq. (31) does not depend on the dust yield. Therefore, we conclude that the dust content in galaxies is independent of the stardust yield after the grain growth in the ISM becomes active, or equivalently, the metallicity exceeds the critical metallicity.
6.2 What kind of dust is formed by the ISM growth?
We have shown that the main production channel of dust is the accretion growth in the ISM of the present-day Milky Way. This conclusion has also been reported in the literature. For example, Zhukovska et al. (2008) argued that the mass fraction of stardusts in the total dust is only 0.1–1% based on a more sophisticated chemical evolution model than in this paper (see their figure 15); more than 99% of dust is originated from accretion growth in the ISM. It is also well known that some interplanetary dust particles show a highly-enhanced abundance of deuterium and 15N relative to the solar composition, which is a signature of a molecular cloud origin because such isotopic fractiona-tions are expected in a low temperature environment (e.g., Messenger, 2000). Therefore, dust produced by the ISM accretion exists. Then, we have a very important question; what kinds of dust species are formed by the accretion growth in the ISM?
In molecular clouds, many kinds of ices such as H2O, CO, CO2, CH3OH have been detected (e.g., Gibb et al., 2000). These ices are condensed onto pre-existent grains. In these ices, some chemical reactions and ultraviolet photolysis (and cosmic rays) process the material and may make it refractory. As a result, so-called ‘core-mantle grains’ coated by refractory organics would be formed (e.g., Li and Greenberg, 1997). Indeed, such a grain has been found in cometary dust: olivine particles produced by a Type II SN coated by organic matter which seems to be formed in a cold molecular cloud (Messenger et al., 2005). Therefore, the ISM dust probably has core-mantle or layered structures. Moreover, the composition can be heterogeneous: for example, graphite coated by silicate, silicate coated by graphite, silicate coated by iron, etc. The formation of such grains does not seem to be studied well. Much more experimental and theoretical work is highly encouraged.
If we can find signatures of the dust accretion growth in the ISM of galaxies by astronomical observations (i.e. very distant remote-sensing), it proves the growth to be ubiquitous. Possible evidence already obtained is a huge mass of dust in galaxies which requires accretion growth as discussed in this paper. It is worth studying how to distinguish stardust grains (or grain cores) and ISM dust (or mantle) by observations, e.g., spectropolarimetry, in the future.
6.3 Dust amount in the proto-solar nebula
We have shown that the dust amount is very small before ISM growth becomes active. For example, the dust-to-gas mass ratio is of the order of 10−4 during the first few Gyr following the formation of the Milky Way (or the onset of the major star formation in the solar neighborhood). If the dust-to-gas ratio in the proto-solar nebula was 10−4, planet formation might have been difficult. Fortunately, the activation of ISM growth is considered to have been about 8 Gyr ago in the solar neighborhood. Thus well before the solar-system formation. Indeed, we expect a dust-to-gas ratio of several times 10−3 at 4–5 Gyr ago (see Fig. 7). Moreover, the dust-to-gas ratio may be much enhanced in the proto-solar nebula relative to the average ISM. This is because the accretion growth is more efficient at a higher density and the density in the proto-solar nebula is several orders of magnitude higher than that in molecular clouds. Therefore, even if the solar-system formation occurred before the activation of ISM growth globally, dust growth might have been active locally in the proto-solar nebula. In this case, the planet formation is always possible if there is enough metal to accrete onto the pre-existent seed grains, even before global growth activation. This is an interesting issue to relate to the Galactic Habitable Zone where complex life can be formed (Lineweaver et al., 2004). We will investigate this more in the future.
1 Without gas infall from intergalactic space, we would expect a much larger number of low-metallicity stars in the solar neighborhood than is observed. This is called the ‘G-dwarf problem’ (e.g., Pagel, 1989).
2 The origin of intergalactic metals and dust is galactic outflows and the amount ejected from galaxies is the same order of that remained in galaxies (e.g., Ménard et al., 2010 for dust; see also Inoue and Kamaya, 2003, 2004, 2010). Dust grains may be ejected from galaxies more efficiently than metals because the grains receive momentum through radiation pressure (Bianchi and Ferrara, 2005). Even in this case, our discussion about the dust-to-metal ratio in Section 5 would not be affected essentially by the omission of this selective removal of dust, although the set of model parameters which can reproduce the observations would change. In any case, this point would be interesting for future work.
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The author thanks anonymous referees for their many suggestions which were useful to improve the presentation and the quality of this paper. The author is grateful to T Kozasa and A. Habe for interesting discussions and for their hospitality during my stay in Hokkaido University, Sapporo, where this work was initiated, to R. Asano, H. Hirashita, and T T Takeuchi for many discussions, to T Nozawa for providing his dust yields in SNe, and to H. Kimura, the chair of the convener of the ‘Cosmic Dust’ session in the AOGS 2010 meeting, for inviting me to the interesting meeting in Hyderabad, India. This work is supported by KAKENHI (the Grant-in-Aid for Young Scientists B: 19740108) by The Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
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Inoue, A.K. The origin of dust in galaxies revisited: the mechanism determining dust content. Earth Planet Sp 63, 2 (2011) doi:10.5047/eps.2011.02.013
- Cosmic dust
- physical processes of dust in the interstellar medium
- galaxy evolution