Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20911302b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #113.02; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Using a probabilistic photometric redshift-based wavelet detection algorithm in the multi-wavelength IRAC Shallow Survey/NDWFS Boötes field, we have a assembled a catalog of 292 candidate galaxy clusters and groups spanning 0 < z < 2, of which 93 are at z > 1. To date we have confirmed 8 z >1 clusters, making this the largest existing sample of spectroscopically confirmed clusters at these redshifts. We are currently accumulating deep ACS, IRAC and MIPS data for the 18 highest significance clusters and groups at z > 1, with which we will measure morphologies, stellar masses and star formation rates in massive cluster galaxies during the peak era of structure formation. A preliminary analysis of the color evolution of the full cluster sample shows that between 0 < z < 1.5 cluster galaxies are well described by short-burst passive evolution models with high formation redshifts, zf > 3. Indeed, the highest redshift clusters provide the strongest such constraints, favoring formation redshifts of zf = 4-5. In addition, we find evidence of a significant decline in the elliptical fraction with redshift, and a corresponding increase in the incidence of late-type or disturbed morphologies in ACS images of spectroscopically confirmed 1 < z < 1.5 clusters.
AGES
Brodwin Mark
Eisenhardt Peter
FLAMEX
Gonzalez Anthony H.
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