Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543629w&link_type=abstract
American Astronomical Society, AAS Meeting #215, #436.29; Bulletin of the American Astronomical Society, Vol. 42, p.389
Astronomy and Astrophysics
Astronomy
Scientific paper
Double-lobed radio sources exhibiting some degree of bending between components are likely to be found in galaxy clusters. Often this radio emission is associated with a cD or giant elliptical galaxy at the center of the cluster. We identified bent double-lobed radio sources as well as straight double-lobed sources in the Faint Images of the Radio Sky at Twenty Centimeters (FIRST) catalog. We have cross-correlated these radio sources with the Sloan Digital Sky Survey (SDSS) catalog and measured the richness of their cluster environments. This has lead to the discovery and classification of a large number of galaxy clusters out to a redshift of z˜0.6. We find that bent double-lobed radio sources are located in rich clusters more frequently than straight double-lobed radio sources and all extended, double-lobed, radio sources are more often located in rich cluster environments than non-extended radio sources. Many of the radio sources in our samples without optical counterparts to the magnitude limit of the SDSS are candidates for even higher-redshift clusters. We have deeply imaged (to mr 24) many of these bent-lobed radio sources with the 1.8 m telescope at Lowell Observatory. We find that a large fraction of these sources are associated with galaxy clusters at magnitudes too faint to be detected in the SDSS. Our sample has the potential to reveal hundreds of high-redshift clusters that can be used for studies of galaxy evolution and cosmology.
Blanton Elizabeth
Wing Joshua
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