Dust-to-Gas Ratio and Phase Transition of Interstellar Medium
Astrophysics
2007-05-23 v1
Abstract
We discuss the time evolution of dust-to-gas mass ratio in the context of multi-phase model of interstellar medium. Phase transition of interstellar gas is considered to occur on a timescale of yr, according to a nonlinear open system model of interstellar medium. Since the phase transition changes the dust formation and destruction rates, the dust-to-gas ratio also fluctuates on the same timescale. This explains the scatter of the dust-to-gas ratios of spiral galaxies quantitatively, though we should note the large observational uncertainty.
Cite
@article{arxiv.astro-ph/9903259,
title = {Dust-to-Gas Ratio and Phase Transition of Interstellar Medium},
author = {H. Hirashita},
journal= {arXiv preprint arXiv:astro-ph/9903259},
year = {2007}
}
Comments
3 pages LaTeX, no figures, to appear in A&A Letter