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Star Formation and Environmental Quenching of GEEC2 Group Galaxies at z~1
Angus Mok, Michael L. Balogh, Sean L. McGee +7
We present new analysis from the GEEC2 spectroscopic survey of galaxy groups at . Our previous work revealed an intermediate population between the star-forming and quiesc…
Star formation in the cluster CLG0218.3-0510 at z=1.62 and its large-scale environment: the infrared perspective
Joana S. Santos, Bruno Altieri, Masayuki Tanaka +7
The galaxy cluster CLG0218.3-0510 at z=1.62 is one of the most distant galaxy clusters known, with a rich muti-wavelength data set that confirms a mature galaxy population already…
A Large Scale Structure at Redshift 1.71 in the Lockman Hole
J. P. Henry, K. Aoki, A. Finoguenov +5
We previously identified LH146, a diffuse X-ray source in the Lockman Hole, as a galaxy cluster at redshift 1.753. The redshift was based on one spectroscopic value, buttressed by…
On the formation time scale of massive cluster ellipticals based on deep near-IR spectroscopy at z~2
Masayuki Tanaka, Sune Toft, Danilo Marchesini +6
We present improved constraints on the formation time scale of massive cluster galaxies based on rest-frame optical spectra of galaxies in a forming cluster located at z=2.16. The…
Efficient satellite quenching at z~1 from the GEEC2 spectroscopic survey of galaxy groups
Angus Mok, Michael L. Balogh, Sean L. McGee +9
We present deep GMOS-S spectroscopy for 11 galaxy groups at 0.8<z<1.0, for galaxies with r_{AB}<24.75. Our sample is highly complete (>66%) for eight of the eleven groups. Using an…
Extraordinary Magnification of the Ordinary Type Ia Supernova PS1-10afx
Robert M. Quimby, Marcus C. Werner, Masamune Oguri +8
Recently, Chornock and co-workers announced the Pan-STARRS discovery of a transient source reaching an apparent peak luminosity of ~4x10^44 erg s^-1. We show that the spectra of th…