Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..868c&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Mar. 15, 1980, p. 868-879.
Astronomy and Astrophysics
Astrophysics
95
Gas Density, Gas Dynamics, Interstellar Gas, Mass Distribution, Stellar Evolution, Cold Gas, Critical Point, Equations Of State, Phase Transformations
Scientific paper
It is shown that for dynamical time scales longer than 10 million years the ensemble of interstellar cold diffuse clouds may be described by equations of mass and momentum conservation where the pressure has the form p/v-squared/ where /v-squared/ is the mass averaged square velocity dispersion. Equilibrium cloud spectra are derived and an equation of state obtained. The equation of state undergoes a phase transition at a critical density close to the local interstellar gas density. At higher densities, more massive clouds are formed and the cloud fluid softens. It is suggested that this mechanism may naturally regulate the interstellar gas density if star formation is very efficient in the cooler high-density systems.
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