Other
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993basi...21..451d&link_type=abstract
Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 21, no. 3-4, p. 451-452
Other
Collisionless Plasmas, Interacting Galaxies, Molecular Clouds, Shock Fronts, Star Formation, Accretion Disks, Infrared Radiation, Luminosity, Stability
Scientific paper
We present a triggering mechanism for starbursts in the central regions of interacting galaxies. As a disk giant molecular cloud (GMC) falls into the central region of a galaxy following a galaxy encounter, it may be compressed by the high pressure of the inter-cloud medium. For a high enough pressure difference, the compression develops into an inwardly propagating, isothermal, spherical shock. When the growth time for gravitational instabilities in the shell become smaller than the crossing time of the shell, the shell becomes unstable and begins to fragment. This gives rise to a burst of star formation. For a galaxy with pre-counter gas parameters as in the Galaxy, this mechanism yields a lower limit to the infra-red luminosity of L approximately 2-6 x 109 solar luminosity. For strong interactions or mergers LIR less than or = 1012 solar luminosity (Jog & Das 1992).
Das Mousumi
Jog Chanda J.
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