2MASS/SDSS Close Major-Merger Galaxy Pairs

Details 2MASS/SDSS Close Major-Merger Galaxy Pairs 2MASS/SDSS Close Major-Merger Galaxy Pairs

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...695.1559d&link_type=abstract

The Astrophysical Journal, Volume 695, Issue 2, pp. 1559-1566 (2009).

Astronomy and Astrophysics

Astronomy

9

Galaxies: Evolution, Galaxies: Interactions, Galaxies: Luminosity Function, Mass Function, Galaxies: Spiral

Scientific paper

We select a close "major-merger candidate" galaxy pair sample in order to calculate the Ks luminosity function (LF) and pair fraction representative of the merger/interaction component of galaxy evolution in the local universe. The pair sample (projected separation 5 h -1 kpc <= r<= 20 h -1 kpc, Ks -band magnitude difference ΔKs <= 1 mag) is selected by combining the Two Micron All Sky Survey (2MASS) with the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5). The resulting data set contains 340 galaxies covering 5800 deg2. A stellar mass function is also translated from the LF. A differential pair fraction displays nearly constant fraction of galaxy pairs as a function of galaxy mass from 109 to 1011.5 M sun. The differential pair fraction is less subject to absolute magnitude bias due to survey limitations than the standard total pair fraction. These results suggest that major-merger candidate pairs in the 0

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