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Radio Source Spectra Towards Clusters of Galaxies as Drawn from Large Surveys

Bibcode
1992ESOC...43..481R
Reuter, H.-P.; Andernach, H.
Bibliographical reference

ESO Conference & Workshop Proceedings, vol. 43, p. 481-486 eds. A. Heck & F. Murtagh, ESO, Garching, Germany

Advertised on:
9
1992
Number of authors
2
IAC number of authors
1
Citations
2
Refereed citations
2
Description
We have used three large-scale radio surveys to study the spectral behaviour of radio sources towards Abell clusters of galaxies. Without attempting to separate genuine cluster sources from background sources, we find a steeper median spectral index within 0.5 Abell radii (r_A_) than between 0.5 and 1 r_A_ (1 r_A_=3 h_50^-1 Mpc, and H_0 = 50 h_50_ km/s/Mpc). Removal of sources with extreme spectral indices yields a high probability for the presence of a correlation (within 1 r_A_) between projected distance from the cluster centre and source spectral index. This precludes a previous conjecture that the trend may be due to a few very steep spectrum sources only. Restriction to stronger sources improves the correlation and increases its slope, suggesting these sources to be more likely associated with cluster members.
Type
Non-refereed
Radio sources

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