Dust-to-gas ratio and phase transition of interstellar medium

被引：0

作者：

Hirashita, H ^{[1
]}

机构：

[1] Kyoto Univ, Fac Sci, Dept Astron, Sakyo Ku, Kyoto 6068502, Japan

来源：

ASTRONOMY & ASTROPHYSICS | 1999年 / 344卷 / 03期

关键词：

ISM : clouds; ISM; dust; extinction; galaxies : evolution; galaxies : ISM; galaxies : spiral;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 10(7-8) 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.

引用

页码：L87 / L89

页数：3

共 22 条

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