Dust-to-Gas Ratio and Multi-Phase Interstellar Medium

Details Dust-to-Gas Ratio and Multi-Phase Interstellar Medium Dust-to-Gas Ratio and Multi-Phase Interstellar Medium

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..405h&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

Computer Science

Scientific paper

We discuss {the time variation of dust-to-gas mass ratio in the context of the multi-phase model of interstellar medium} in spiral galaxies. The typical timescale of the phase change of an interstellar gas is 107-8 yr in spiral galaxies. Since the phase transition changes the filling factor of the cold gas where the dust growth occurs, the dust growth rate varies on that timescale. In order to examine the response of the dust-to-gas ratio to the phase transition, we construct a model of the time evolution of the dust-to-gas ratio. We adopt the limit-cycle model for the phase transition, which is supported by the recent observational studies. In the model, the filling factor of the cold component oscillates temporally. After solving the model equations, we show that the dust-to-gas ratio varies in response to the phase transition if the dust growth timescale is shorter than the phase transition timescale.

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