Meger Rates in Distant Cluster Environments

Details Meger Rates in Distant Cluster Environments Meger Rates in Distant Cluster Environments

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.6608p&link_type=abstract

American Astronomical Society Meeting 208, #66.08; Bulletin of the American Astronomical Society, Vol. 38, p.146

Astronomy and Astrophysics

Astronomy

Scientific paper

We present constraints on the frequency of galaxy mergers in z 1 clusters observed with the ACS on HST as part of our GTO cluster survey. Our primary results are that MS1054 and CL0152 (both at z=0.83) have comparable merger fractions. A significant excess of red galaxy pairs appears to be a common (but not a universal) phenomenon associated with very dense environments at z 1. It is not seen at lower z nor in less massive (<5 x1014 solar masses) hi-z clusters. Early type mergers are largely confined to the central regions and the late type merger fraction is not strongly dependent on radius once beyond central 500 kpc or so. We also find that the brightest cluster galaxy is still undergoing significant assembly in many z 1 clusters.

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