Statistics of interacting galaxies at z~0.7

Details Statistics of interacting galaxies at z~0.7 Statistics of interacting galaxies at z~0.7

2011-09-28

arxiv.org/abs/1109.6159v1

Astron. Lett., vol.37, 743-750, 2011; Pis'ma Astron.Zh., vol.37, 803-810, 2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 3 figures

Scientific paper

We present the results of our analysis of the frequencies of galaxies with tidal tails and M51-type galaxies in several deep fields of the Hubble Space Telescope (HDF-N, HDF-S, HUDF, GOODS, GEMS). In total, we have found about seven hundred interacting galaxies at redshifts z<1.5 in these fields. At z<0.7, the observed space densities of galaxies with tidal structures and M51-type galaxies have been found to increase as $\propto (1+z)^m$, where m~2.6. According to our estimates, over the last 6-7 Gyr, i.e., at z<0.7, about a third of the galaxies with M(B)<-18 mag must have undergone strong gravitational perturbations and mergers and ~1/10-1/5 of the galaxies have accreted relatively low-mass nearby satellites typical of M51-type galaxies. The possible decrease in the timescale on which a distant galaxy appears peculiar with growing z can increase considerably the estimated rate of mergers.

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