Clumped X-ray emission around radio galaxies in Abell clusters

Details Clumped X-ray emission around radio galaxies in Abell clusters Clumped X-ray emission around radio galaxies in Abell clusters

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423...94b&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 423, no. 1, p. 94-115

Astronomy and Astrophysics

Astrophysics

76

Emission Spectra, Galactic Clusters, Radio Galaxies, Stellar Luminosity, X Ray Stars, Active Galactic Nuclei, Brightness Distribution, Heao 2, Monte Carlo Method, Proportional Counters, Very Large Array (Vla)

Scientific paper

We have made a comparison of the X-ray and radio morphologies for a sample of 41 rich cluster fields using Einstein Observatory Imaging Proportional Counter (IPC) and Very Large Array (VLA) 20 cm images. Surprisingly, we find that 75% of the radio galaxies have a statistically significant X-ray peak or subclump within 5 min of the radio galaxy position. The X-ray luminosity and the generally extended nature of the X-ray subclumps suggest that these subclumps are overdense regions emitting free-free radiation, although there is also evidence for Active Galactic Nuclei (AGN) X-ray emission coming from some of the more compact, high surface brightness X-ray peaks. Some interesting correlations with radio morphology were also discovered. For clusters which contain wide-angle-tailed radio sources associated with centrally dominant galaxies, there are significant elongations or clumps in the central X-ray emission which are unusual for this type of cluster. We suggest that cluster radio galaxies are pointers to particular clusters or regions within clusters that have recently undergone mergers between cluster subsystems.

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