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2MASS/SDSS Close Major-Merger Galaxy Pairs: Luminosity Functions and Merger Mass Dependence | | Donovan L. Domingue
; C. K. Xu
; T. H. Jarrett
; Y. Cheng
; | | Date: |
28 Jan 2009 | | Abstract: | We select a close "major-merger candidate" galaxy pair sample in order to
calculate the K_{s} 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 $leq$ r $leq$ 20
h$^{-1}$ kpc, $K_{s}$-band magnitude difference $Delta$$K_{s}$ $leq$ 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 sq. degrees. 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 10$^{9}$ to
10$^{11.5}$ 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$<$z$<$0.1 universe are developed from $sim$1.6% of the galaxy population
without dependance on galaxy mass for pair components below 10$^{11}$
M$_{sun}$. The derived LF combined with merger model time scales give local
merger rates per unit volume which decrease with masses greater than 10$^{11}$
M$_{sun}$ . | | Source: | arXiv, 0901.4545 | | Services: | Forum | Review | PDF | Favorites | |
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