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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.…
The Initial-Final Mass Relation: Direct Constraints at the Low Mass End
Jasonjot S. Kalirai, Brad M. S. Hansen, Daniel D. Kelson +3
The initial-final mass relation represents a mapping between the mass of a white dwarf remnant and the mass that the hydrogen burning main-sequence star that created it once had. T…
Stellar Evolution in NGC 6791: Mass Loss on the Red Giant Branch and the Formation of Low Mass White Dwarfs
Jasonjot S. Kalirai, P. Bergeron, Brad M. S. Hansen +4
We present the first detailed study of the properties (temperatures, gravities, and masses) of the NGC 6791 white dwarf population. This unique stellar system is both one of the ol…
The Distribution of AGN in Clusters of Galaxies
Paul Martini, John S. Mulchaey, Daniel D. Kelson
We present a study of the distribution of AGN in clusters of galaxies with a uniformly selected, spectroscopically complete sample of 35 AGN in eight clusters at z = 0.06 to 0.31.…
A Keck Spectroscopic Survey of MS1054-03 (z=0.83): Forming the Red Sequence
Kim-Vy H. Tran, Marijn Franx, Garth D. Illingworth +4
Using a magnitude-limited, spectroscopic survey of the X-ray luminous galaxy cluster MS1054-03, we isolate 153 cluster galaxies and measure MS1054's redshift and velocity dispersio…