Triggering of starbursts in galaxies by minor mergers

Details Triggering of starbursts in galaxies by minor mergers Triggering of starbursts in galaxies by minor mergers

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...425l..13m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L13-L16

Mathematics

278

Astronomical Models, Computerized Simulation, Cosmology, Disk Galaxies, Dwarf Galaxies, Galactic Evolution, Galactic Structure, Interacting Galaxies, Starburst Galaxies, Deposition, Galactic Bulge, Hydrodynamics, Interstellar Matter, Many Body Problem, Stellar Evolution, Trees (Mathematics)

Scientific paper

Using numerical simulation, we explore the triggering of starburst activity in disk galaxies which accrete low-mass dwarf companions. In response to the tidal perturbation of an infalling satellite, a disk galaxy develops a strong two-armed spiral pattern, which in turn drives large quantities of disk gas into its central regions. The global star formation rate stays constant during the early stages of an accretion, before rising rapidly by an order of magnitude when the central gas density becomes very large. The associated central starburst is quite compact. Models which include a bulge component in the disk galaxy show that the presence of a bulge can suppress the radial gas flow and limit the strength of the associated starburst, depending on the overall mass profile. The fact that such relatively common 'minor' mergers may trigger strong starburst activity suggests that many disk galaxies may have experienced starbursts at some point in their lifetime. Implications for galaxy evolution and formation are discussed.

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