Fig. 3.
Photoelectric heating rate per grain as a function of grain size: (a) heating rate with the W+06 yield model and (b) ratio of the heating rate with the W+06 yield model to that with the WD01 yield model. The solid lines are the graphite case and the dashed lines are the silicate case. The assumed quantities are noted in the panels as the hydrogen density nH,-5 = nH/10-5 cm-3, the gas temperature T,4 = T/104 K, the radiation intensity JL,-21 = JL/10-21 erg s-1 cm-2 Hz-1 sr-1, and the spectral index of the radiation field p = 1. The thin solid line in the panel (a) shows the slope proportional to the square of size.