High Frequency Spectra of Cluster Radio Galaxies

Details High Frequency Spectra of Cluster Radio Galaxies High Frequency Spectra of Cluster Radio Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0207p&link_type=abstract

American Astronomical Society Meeting 210, #02.07; Bulletin of the American Astronomical Society, Vol. 39, p.94

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used the National Radio Astronomy Observatory's VLA to determine the cm-wave spectra of 150 radio galaxies in low-redshift (z < 0.25) clusters that are detected in X-rays. The clusters were selected from the survey conducted by Ledlow & Owen (AJ, 1995), who provided redshift measurements and 1.4 GHz flux densities of all the radio sources. Our snapshot observations were made essentially simultaneously at 4.86, 8.46, 22.4 and 43.1 GHz; the synthesized beam size was 12”, 7”, 3” and 1.5”, respectively. Approximately 40-50% of the observed sources or clearly distinguished cores of classic FR radio galaxies were unresolved at arcsecond scales. While the large, resolved, radio lobes had steep spectra, as expected, half of the unresolved sources had flat or inverted spectra at 22-43 GHz. Such sources may interfere with sensitive Sunyaev-Zel'dovich studies of clusters, as planned for Planck, SPT and ACT.

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