The Polytropic Equation of State of Interstellar Gas Clouds

Details The Polytropic Equation of State of Interstellar Gas Clouds The Polytropic Equation of State of Interstellar Gas Clouds

2000-02-25

arxiv.org/abs/astro-ph/0002483v1

Astrophys.J. 538 (2000) 115

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ

Scientific paper

10.1086/309118

Models are presented for the polytropic equation of state of self-gravitating, quiescent interstellar gas clouds. A detailed analysis, including chemistry, thermal balance, and radiative transfer, is performed for the physical state of the gas as a function of density, metallicity, velocity field, and background radiation field. It is found that the stiffness of the equation of state strongly depends on all these physical parameters, and the adiabatic index varies between 0.2-1.4. The implications for star formation, in particular at high redshift and in starburst galaxies, and the initial stellar mass function are discussed.

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