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A Wide-Field Study of the z~0.8 Cluster RX J0152.7-1357: the Role of Environment in the Formation of the Red-Sequence
Shannon G. Patel, Daniel D. Kelson, Bradford P. Holden +4
[ABRIDGED] We present the first results from the largest spectroscopic survey to date of an intermediate redshift galaxy cluster, the z=0.834 cluster RX J0152.7-1357. We use the co…
Abell 851 and the Role of Starbursts in Cluster Galaxy Evolution
A. Oemler, A. Dressler, D. Kelson +5
We use extensive new observations of the very rich z ~ 0.4 cluster of galaxies A851 to examine the nature and origin of starburst galaxies in intermediate-redshift clusters. New HS…
The Ellipticities of Cluster Early-type Galaxies from z~1 to z~0: No Evolution in the Overall Distribution of Bulge-to-Disk Ratios
B. P. Holden, M. Franx, G. D. Illingworth +7
We have compiled a sample of early-type cluster galaxies from 0 < z < 1.3 and measured the evolution of their ellipticity distributions. Our sample contains 487 galaxies in 17 z>0.…
Wide-Field Chandra X-Ray Observations of AGN in Abell 85 & Abell 754
Gregory R. Sivakoff, Paul Martini, Ann I. Zabludoff +2
To better understand the mechanism or mechanisms that lead to AGN activity today, we measure the X-ray AGN fraction in a new sample of nearby clusters and examine how it varies wit…
Mass-Selection and the Evolution of the Morphology-Density Relation from z=0.8 to z=0
B. P. Holden, G. D. Illingworth, M. Franx +11
We examined the morphology-density relations for galaxy samples selected by luminosity and by mass in each of five massive X-ray clusters from z=0.023 to 0.83 for 674 spectroscopic…
First Measurement of a Rapid Increase in the AGN Fraction in High-Redshift Clusters of Galaxies
Jason Eastman, Paul Martini, Gregory Sivakoff +3
We present the first measurement of the AGN fraction in high-redshift clusters of galaxies (z~0.6) with spectroscopy of one cluster and archival data for three additional clusters.…