Journal
ASTROPHYSICAL JOURNAL
Volume 732, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/732/2/95
Keywords
galaxies: active; galaxies: clusters: general; intergalactic medium; radio continuum: galaxies; X-rays: galaxies: clusters
Categories
Funding
- NASA, Chandra X-ray Center (CXC) [PF0-110071]
- European Community under the Marie Curie Research Training Network
- Smithsonian Institution
- CXC
- Chandra X-ray Observatory Center [GO8-9127XR, AR0-11017X, GO0-11003X]
- [NNX07AE95GR]
- [ASI-INAF I/088/06/0]
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We present new Giant Metrewave Radio Telescope observations at 235 MHz and 610 MHz of 18 X-ray bright galaxy groups. These observations are part of an extended project, presented here and in future papers, which combines low-frequency radio and X-ray data to investigate the interaction between central active galactic nuclei (AGNs) and the intra-group medium (IGM). The radio images show a very diverse population of group-central radio sources, varying widely in size, power, morphology, and spectral index. Comparison of the radio images with Chandra and XMM-Newton X-ray images shows that groups with significant substructure in the X-ray band and marginal radio emission at greater than or similar to 1 GHz host low-frequency radio structures that correlate with substructures in IGM. Radio-filled X-ray cavities, the most evident form of AGN/IGM interaction in our sample, are found in half of the systems and are typically associated with small, low-, or mid-power double radio sources. Two systems, NGC5044 and NGC4636, possess multiple cavities, which are isotropically distributed around the group center, possibly due to group weather. In other systems the radio/X-ray correlations are less evident. However, the AGN/IGM interaction can manifest itself through the effects of the high-pressure medium on the morphology, spectral properties, and evolution of the radio-emitting plasma. In particular, the IGM can confine fading radio lobes in old/dying radio galaxies and prevent them from dissipating quickly. Evidence for radio emission produced by former outbursts that co-exist with current activity is found in six groups of the sample.
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