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NIR Luminosity Function of Galaxies in Close Major-Merger Pairs and Mass Dependence of Merger Rate | | C.K. Xu
; Y.C. Sun
; X.T. He
; | | Date: |
8 Feb 2004 | | Journal: | Astrophys.J. 603 (2004) L73-L76 | | Subject: | astro-ph | | Affiliation: | IPAC, Caltech), Y.C. Sun (BNU), X.T. He (BNU | | Abstract: | A sample of close major-merger pairs (projected separation ${
m 5 leq r leq 20 h^{-1}}$ kpc, ${
m K_s}$ band magnitude difference $delta {
m K_s} leq 1$ mag) is selected from the matched 2MASS-2dFGRS catalog of Cole et al. (2001). The pair primaries are brighter than ${
m K_s} = 12.5$ mag. After corrections for various biases, the comparison between counts in the paired galaxy sample and counts in the parent sample shows that for the local `M* galaxies’ sampled by flux limited surveys, the fraction of galaxies in the close major-merger pairs is 1.70$pm 0.32%$. Using 38 paired galaxies in the sample, a ${
m K_s}$ band luminosity function (LF) is calculated. This is the first unbiased LF for a sample of objectively defined interacting/merging galaxies in the local universe, while all previously determined LFs of paired galaxies are biased by mistreating paired galaxies as singles. A stellar mass function (MF) is translated from the LF. Compared to the LF/MF of 2MASS galaxies, a differential pair fraction function is derived. The results suggest a trend in the sense that less massive galaxies may have lower chance to be involved in close major-merger pairs than more massive galaxies. The algorithm presented in this paper can be easily applied to much larger samples of 2MASS galaxies with redshifts in near future. | | Source: | arXiv, astro-ph/0402174 | | Services: | Forum | Review | PDF | Favorites | |
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