The effect of heating and cooling on the velocity fluctuations in the ISM induced by the system of stars

Details The effect of heating and cooling on the velocity fluctuations in the ISM induced by the system of stars The effect of heating and cooling on the velocity fluctuations in the ISM induced by the system of stars

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161...23d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 23-30. DFG-supported research.

Astronomy and Astrophysics

Astrophysics

9

Gravitational Collapse, Interstellar Gas, Molecular Clouds, Temperature Effects, Cooling, Flow Velocity, Heating, Line Spectra, Polytropic Processes, Systems Stability, Viscosity

Scientific paper

Dissipative thermal effects are taken into account in the expressions for interstellar gas velocity fluctuations (due to the gravitational interaction with stars) derived by Kegel and Volk (1983), with application to the interpretation of interstellar lines, the large scale flow of the interstellar matter, and the collapse of interstellar clouds. Results indicate a decrease in the critical wavelength for gravitational instability, which value is prevented by thermal effects from becoming zero when the relative velocity approaches the velocity of sound, in contradiction with the results of Kegel and Volk, and of Niimi (1970). The velocity fluctuations in the gas derived by Kegel and Volk are shown to be reduced considerably, though velocity fluctuations many times the velocity of sound, which increase with increasing relative motion between gas and stars, are found, principally in molecular clouds.

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