Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3804b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #38.04; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
Both observations and high-resolution models of galaxy interactions show that close galaxy-galaxy pericentric passes torque galaxies and trigger global bursts of star formation. Catalogs of galaxies in close pairs are rich in galaxies that have had close galaxy-galaxy passes already. However, pair catalogs also necessarily include interlopers, galaxies that have not yet had their first close pass, and projections within a looser group. We probe the evolution of galaxies in pairs using a model for the detailed evolution of substructure in cosmological halos. The model couples cosmological simulations to an analytic subhalo model that tracks substructure within parent halos by integrating the orbits of galaxies. The code describes the last major merger and all the pericentric passages of subhalos with their host halos. In order to aid the interpretation of galaxy pair catalogs, we characterize (1) the fraction of galaxies in observed pairs that will have already had a close pericentric pass, (2) the strength of that pass, (3) the amount of time the pair will continue without merging, and (4) the dependence of these quantities on the observable orbit and environment parameters. We also present prescriptions for relating galaxy pair counts to the merger rate of luminous galaxies.
Barton Elizabeth J.
Bullock James S.
Wechsler Risa H.
Zentner Andrew R.
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