Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50726h&link_type=abstract
Spitzer Proposal ID #50726
Computer Science
Scientific paper
Star forming galaxies comprise <4% of the massive galaxy population in clusters at z~1. In contrast, this fraction is 40% in the field at the same redshift. The average cluster will double to triple in mass between z~1 and today, and both theory and observations show that this mass assembly occurs mostly through the infall of groups of galaxies from the field. Therefore, massive galaxies in these groups must have stopped forming stars before they merged with the cluster in order to preserve the low fraction of star-forming cluster galaxies. Theoretical models also suggest that the group environment is where the cessation of star-formation is most effective. We intend to look for evidence of this by surveying groups of galaxies that will fall into two z=0.83 clusters of galaxies. Our spectroscopic survey is >90% complete for massive galaxies in one of the clusters - a total 2245 redshifts in the cluster and its outskirts - and the survey of the second cluster is ongoing. From the current catalogs, we have selected 10 groups of galaxies in the outskirts that will become part of the cluster by the present epoch. Our proposed MIPS and IRAC observations, when combined with the data we have in hand, will help determine the star-formation and stellar mass content of galaxies in these groups. We expect to see a distinct reduction in the fraction of massive star-forming galaxies and/or in the average star-formation rate for galaxies in these groups. If this is correct, the processes that transform galaxies into the passively evolving, red-sequence cluster members occurs in the infalling groups, and not necessarily in the cluster core.
Holden Bradford
Illingworth Garth
Kelson Daniel
Patel Shannon
van der Wel Arjen
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