A radio survey of clusters of galaxies. III - 6.2 CM observations, radio spectra and optical identifications of sources in 29 Abell clusters

Details A radio survey of clusters of galaxies. III - 6.2 CM observations, radio spectra and optical identifications of sources in 29 Abell clusters A radio survey of clusters of galaxies. III - 6.2 CM observations, radio spectra and optical identifications of sources in 29 Abell clusters

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...41..339a&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 41, Sept. 1980, p. 339-394. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astronomy

33

Astronomical Maps, Centimeter Waves, Galactic Clusters, Radio Sources (Astronomy), Astronomical Catalogs, Optical Measurement, Statistical Correlation

Scientific paper

As part of a program of high-frequency observations of clusters of galaxies we mapped twenty-nine Abell clusters of galaxies at 4 850 MHz (λ 6.2 cm) using the 100-m radio telescope. The angular resolution at this wavelength is 2.6 arcmin, and r.m.s. noise levels of between 0.6 and 7 mJy/(beam area) were achieved. The radio maps were superimposed onto the optical fields of the Palomar Observatory Sky Survey red (E) prints. This revealed a large fraction of empty fields or optical objects significantly separated from the radio peak. Radio spectra of most of the detected sources were obtained by combining our published flux data with those at lower frequencies. We find a trend for cluster source spectra to become steeper with decreasing distance from the cluster centre, but the statistics is still too poor to detect a significant correlation between spectral index and distance from the cluster centre. In a few cases there is an indication of low-level extended cluster emission. For A23l9 the radio halo is clearly detected at 4 850 MHz.

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