Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2006k&link_type=abstract
American Astronomical Society, AAS Meeting #211, #20.06; Bulletin of the American Astronomical Society, Vol. 39, p.771
Astronomy and Astrophysics
Astronomy
Scientific paper
We present current results from the ORELSE survey, which is conducting an extensive multiwavelength study into the mechanisms that drive galaxy evolution in and around large-scale structures at high redshift. It is still unclear what physical mechanisms associated with the cluster environment are responsible for the suppression of star formation and nuclear activity and the transformation of gaseous, disk galaxies into passive spheroids. Because galaxy environment should change dramatically during the course of vigorous cluster assembly, the large-scale structure present around high-redshift clusters offers us the unique opportunity to probe the physical effects on galaxies as they assemble into denser regions. With this in mind, the ORELSE survey is searching for large-scale structure around 20 X-ray and optically selected clusters at 0.6 < z < 1.3 using wide-field optical imaging covering a total of 5 square degrees. Thus far we have detected and spectroscopically confirmed two large-scale superclusters and two complex merger systems. These include the Cl1604 supercluster at z=0.9, which consists of at least eight clusters and groups spanning over 30 arcminutes on the sky and 100 Mpc in depth, the Cl1324 supercluster at z=0.73 which contains at least seven clusters in our survey area, and the Cl0023 system of four merging groups at z = 0.84. Our best-studied system thus far is the Cl1604 supercluster, for which we have compiled a multiwavelenth dataset that includes a 17-pointing HST-ACS mosaic, Chandra, VLA, and Spitzer observations covering the entire supercluster, and spectroscopic redshifts for nearly 1400 galaxies in the field. To date, Cl1604 is the largest structure mapped at z 1, with the most constituent clusters and the largest number of spectroscopically confirmed member galaxies. We present the complex three-dimensional structure of Cl1604 and the manner in which nuclear activity, morphology and star formation activity correlate with substructure within the supercluster.
Fassnacht Chris
Gal Roy R.
Kocevski Dale D.
Lemaux Brian
Lubin Lori Maxine
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