Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743025l&link_type=abstract
American Astronomical Society, AAS Meeting #217, #430.25; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
We present the color, spectral, and morphological properties of the 517 member galaxies of the Cl1604 supercluster at z 0.9. This system is a rich collection of five groups and three clusters that range in virial mass from 2x10^13 M_sun to 3x10^14 M_sun. The range of environments present in the supercluster, varying from rich clusters dominated by a hot intracluster medium to sparse chains of galaxies dominated by starbursts and luminous AGN, make this system ideal to study galaxy evolution. Comparing the color and magnitude properties of the member galaxies of the eight constituent structures in the supercluster, we find that the three clusters as well as the combined group sample have well-established red sequences. Though the brightest red-sequence galaxies are found in the two most massive systems, many of the most massive early-type red-sequence galaxies are found, surprisingly, in the group environment. The red-sequence fraction is observed to strongly correlate with velocity dispersion, with the exception of our most massive system in which a large fraction of the member galaxies are blueward of the red-sequence. The blue galaxy population in our most massive system differs significantly from blue galaxy population observed in the groups as it is primarily comprised of low-mass late-type galaxies found at large clustocentric distances. The average spectral properties of the member galaxies of the three cluster systems is consistent with continuous star-formation. In contrast, the average properties of the member galaxies of the group systems are much more diverse, with some groups comprised primarily of star-bursting or post-starburst galaxies, while other groups are primarily populated by continuous star-forming or quiescent galaxies. We also discuss the possible implications of these results in determining the processes responsible for transforming blue late-type galaxies to red, quiescent ellipticals in high redshift groups and clusters.
Fassnacht Chris D.
Gal Roy R.
Kocevski Dale D.
Lacy Mark
Lemaux Brian
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