The SDSS DR6 Adaptive Match Filter Cluster Catalog And the Brightest Cluster Galaxies

Details The SDSS DR6 Adaptive Match Filter Cluster Catalog And the Brightest Cluster Galaxies The SDSS DR6 Adaptive Match Filter Cluster Catalog And the Brightest Cluster Galaxies

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743039p&link_type=abstract

American Astronomical Society, AAS Meeting #217, #430.39; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new cluster catalog extracted from SDSS-DR6 using an adaptive matched filter (AMF) cluster finder. We identify 69,173 galaxy clusters in the redshift range 0.045We compare the AMF catalog with the maxBCG, GMBCG and Wen et al ones.
A comparison with the maxBCG catalog shows that clusters match at about the 40% level for all redshifts. The AMF catalog matches all maxBCG clusters with 100We find 539 matches with X-ray clusters, 119 with temperature measurements.
We present scaling relations between optical and X-ray properties and cluster center comparison.
Finally, we study the properties of the Brightest Cluster Galaxies (BCGs).
We find that the BCG luminosity distribution is close to a Gaussian, whose mean has a redshift evolution broadly consistent with pure aging of the galaxies. Richer clusters tend to have brighter BCGs, however less dominant than in poorer systems. 4-9% of our BCGs are at least 0.3 mag bluer in the g-r colour than the red-sequence at their given redshift. Such a fraction decreases to 1-6% for clusters above a richness of 50, where 3% of the BCGs are 0.5 mag below the red-sequence. In terms of redshift evolution, the overall blue fraction seems to increase with redshift from 5% at 0.1We also cross-matched our catalog with UV data from Galex. We show a correlation between offset from the optical red-sequence and the amount of UV-excess.
We cross-matched our catalog with the ACCEPT cluster sample, and find that blue BCGs tend to be in clusters with low entropy and short cooling times.
Research supported by NASA and NSF.

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