DO SUBMILLIMETER GALAXIES REALLY TRACE THE MOST MASSIVE DARK-MATTER HALOS? DISCOVERY OF A HIGH-z CLUSTER IN A HIGHLY ACTIVE PHASE OF EVOLUTION

S. C. Chapman (7601474)
A. Blain (7599962)
R. Ibata (7590692)
R. J. Ivison (7601480)
I. Smail (7599914)
G. Morrison (7603214)

Publication date

January 2009

Abstract

We present detailed observations of a z ~ 1.99 cluster of submillimeter galaxies (SMGs), discovered as the strongest redshift spike in our entire survey of ~100 SMGs across 800 arcmin2. It is the largest blank-field SMG concentration currently known and has <0.01% chance of being drawn from the underlying selection function for SMGs. We have compared UV observations of galaxies at this redshift, where we find a much less dramatic overdensity, having an 11% chance of being drawn from its selection function. We use this z ~ 1.99 overdensity to compare the biasing of UV- and submillimeter-selected galaxies, and test whether SMGs could reside in less overdense environments, with their apparent clustering signal being dominated by highly active ...