Statistics of interacting galaxies at z~0.7

Abstract

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.

8 pages, 3 figures

References in corpus (9)

• The Nearly Universal Merger Rate of Dark Matter Haloes in Lambda-CDM Cosmology
• A calibration of the relation between the abundance of close galaxy pairs and the rate of galaxy mergers
• The Structures of Distant Galaxies - III: The Merger History of over 20,000 Massive Galaxies at z < 1.2
• The VIMOS VLT Deep Survey: the contribution of minor mergers to the growth of L_B >= L*_B galaxies since z ~ 1 from spectroscopically identified pairs
• Simulating the COSMOS: The fraction of merging galaxies at high redshift
• Tidal streams around galaxies in the SDSS DR7 archive
• The zCOSMOS redshift survey : Influence of luminosity, mass and environment on the galaxy merger rate
• HUDF 1619 - a candidate polar-ring galaxy in the Hubble Ultra Deep Field
• On the characteristics of tidal structures of interacting galaxies

Cited by in corpus (1)

• The luminosity function of ringed galaxies