Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.358..734h&link_type=abstract
Nature (ISSN 0028-0836), vol. 358, no. 6389, Aug. 27, 1992, p. 734-736. Research supported by Alfred P. Sloan Foundation, NASA,
Astronomy and Astrophysics
Astronomy
19
Galactic Nuclei, Shell Galaxies, Star Formation, Starburst Galaxies, Black Holes (Astronomy), Galactic Structure, Interstellar Gas, Stellar Mass Accretion
Scientific paper
Simulations of shell-forming galaxy mergers are reported in which gas and stars are tracked separately to study the implications of observations that indicate fine structures in elliptical galaxies. The hybrid N-body/hydrodynamics code by Hernquist and Katz (1989) is employed neglecting the self-gravity of galaxies in tidal disruptions by massive primaries of small dwarf galaxies. The evolution of the galactic debris is examined showing that the gas and stars are effectively segregated with the stars forming sharp-edged features and the gas forming disks in the nucleus of the primary. Star formation is theorized to occur in the nuclei of shell galaxies due to shocks in the gas, and the added presence of a black hole can lead to an active galactic nucleus. The simulation is of interest to the interpretation of such observations as those of NGC1275 in which dormant elliptical galaxies are activated by mergers between large galaxies and gas-rich satellites.
Hernquist Lars
Weil Melinda L.
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