Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....36..179b&link_type=abstract
Astronomy and Astrophysics, vol. 36, no. 2, Nov. 1974, p. 179-189.
Astronomy and Astrophysics
Astrophysics
14
Gravitational Effects, Interstellar Gas, Mass Distribution, Shock Waves, Stellar Mass, Wave Packets, Gas Density, Mathematical Models, Perturbation Theory, Shock Fronts, Stellar Evolution, Thermal Instability, Thermodynamic Properties
Scientific paper
We have numerically studied the interaction between interstellar gas and a gravitational perturbation produced by a fluctuation in the stellar mass distribution. For a simple equation of state, shock waves develop even if the gravitational perturbation is aperiodic and transient. In a medium which can change thermal phase, shocks do not form and the gas makes a transition directly to the cold, dense phase. The cold material has an anomalous velocity imparted to it by the gravitational perturbation and it becomes an accretion front moving through the hot gas and capturing it. The accretion fronts trigger thermal phase change on a large scale and can reproduce the extent of observed cold clouds. Furthermore their high mass is favorable to gravitational instability and subsequent star formation.
Baker P. L.
Barker Paul K.
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