The CFHTLS Deep Catalog of Interacting Galaxies I. Merger Rate Evolution to z=1.2

Details The CFHTLS Deep Catalog of Interacting Galaxies I. Merger Rate Evolution to z=1.2 The CFHTLS Deep Catalog of Interacting Galaxies I. Merger Rate Evolution to z=1.2

2010-01-15

arxiv.org/abs/1001.2772v1

Astrophysical Journal 709 (2010) 1067-1082

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

e.g.: 17 pages, 14 figures, accepted for publication in ApJ

Scientific paper

We present the rest-frame optical galaxy merger fraction between 0.24sigma level of confidence. A mild trend, where massive galaxies with M>10^10.7 M_sun are undergoing fewer mergers than less massive systems M~10^10 M_sun), consistent with the expectations of galaxy assembly downsizing is observed. Our results also show that interacting galaxies have on average SFRs double that found in non-interacting field galaxies. We conclude that (1) the optical galaxy merger fraction does evolve with redshift, (2) the merger fraction depends mildly on stellar mass, with lower mass galaxies having higher merger fractions at z<1, and (3) star formation is triggered at all phases of a merger, with larger enhancements at later stages, consistent with N-body simulations.

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