Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/1526
Title: Starbursts triggered by central overpressure in interacting galaxies
Authors: Mousumi Das
Jog, C. J
Keywords: Galaxies;Starbursts
Issue Date: 1993
Publisher: Astronomical Society of India
Citation: BASI, Vol. 21, pp. 451-452
Abstract: 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 10/sup9/ solar luminosity. For strong interactions or mergers LIR less than or = 10/sup12/ solar luminosity (Jog & Das 1992)
URI: http://hdl.handle.net/2248/1526
Appears in Collections:BASI Publications

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