Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....117.1651g&link_type=abstract
The Astronomical Journal, Volume 117, Issue 4, pp. 1651-1656.
Astronomy and Astrophysics
Astronomy
33
Cosmology: Dark Matter, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Formation, Galaxies: Interactions
Scientific paper
Using cosmological N-body simulations of critical and open cold dark matter (CDM) models, we have identified galaxy-sized dark matter halos originated by major binary mergers. Remnants of major merging events between redshift z=1 and the present have typically not yet been accreted into groups and clusters, and hence they can be linked to bright early-type field galaxies. The rate of formation of binary merger remnants is 1.9x10^-13(1+z)^3.1+/-0.2 and 1.6x10^-14(1+z)^2.5+/-0.4 h^3 Mpc^-3 yr^-1 for a critical tilted CDM and an open CDM model, respectively. The average age of these merger remnants is about 6 Gyr, 40% of the age of the universe. In an open universe, field early-type galaxies formed at z<1 by major mergers would account for only ~5% of the total population of early-type galaxies. This fraction is much higher (~55%) in critical models. These results are discussed together with present observational constraints.
Gardner Jeffrey P.
Governato Fabio
Lake George
Quinn Thomas
Stadel Joachim
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