Major-Merger Galaxy Pairing in the 2MASS and SDSS databases.

Details Major-Merger Galaxy Pairing in the 2MASS and SDSS databases. Major-Merger Galaxy Pairing in the 2MASS and SDSS databases.

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717911d&link_type=abstract

American Astronomical Society Meeting 207, #179.11; Bulletin of the American Astronomical Society, Vol. 37, p.1455

Astronomy and Astrophysics

Astronomy

2

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 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 δ Ks ≤ 1mag) is selected by combining the Two Micron All Sky Survey (2MASS) with the Sloan Digital Sky Survey (SDSS) Data Release 3 (DR3). The resulting data set contains 122 galaxies covering 3500 sq. degrees. A stellar mass function is also translated from the LF. Contrary to previous results from a smaller sample, the derived pair LF has a consistent profile with that of 2MASS galaxies in general. A differential pair fraction therefore displays nearly constant fraction of galaxy pairs as a function of galaxy mass from 109.5 to 1011.5 solar masses. This suggests that major-mergers are produced in equal fractions regardless of galaxy mass.

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