Radio Halo and Relic Candidates from the Westerbork Northern Sky Survey
Abstract
We have undertaken a systematic search for diffuse radio halos and relics in all of the Abell clusters that are visible in the Westerbork Northern Sky Survey. In this survey we found 18 candidates, 11 of which are already known from the literature and seven for which we provide the first evidence of diffuse radio emission. All the clusters in this sample show other evidence for a recent or ongoing merger. We also investigate the correlation between cluster X-ray luminosity and radio power of halos. We develop a very simple model for merger shocks that reproduce the sense of this correlation, although it is probably not as steep as the correlation in the data. We discuss the implications of X-ray-radio correlations for future detections of radio halos.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 2001
- DOI:
- 10.1086/319024
- arXiv:
- arXiv:astro-ph/0010251
- Bibcode:
- 2001ApJ...548..639K
- Keywords:
-
- ISM: Cosmic Rays;
- Galaxies: Clusters: General;
- Galaxies: Intergalactic Medium;
- Magnetic Fields;
- Radio Continuum: Galaxies;
- X-Rays: General;
- Astrophysics
- E-Print:
- Accepted for publication in the Astrophysical Journal. 12 pages with 9 embedded Postscript figures in emulateapj5.sty. A higher resolution version of the paper is available at http://www.astro.virginia.edu/~jck7k/research/papers/WENSS.ps.gz