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DC Field | Value | Language |
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dc.contributor.author | Giacintucci, Simona | en_US |
dc.contributor.author | O'Sullivan, Ewan | en_US |
dc.contributor.author | Vrtilek, Jan | en_US |
dc.contributor.author | David, Laurence P. | en_US |
dc.contributor.author | Raychaudhury, Somak | en_US |
dc.contributor.author | Venturi, Tiziana | en_US |
dc.contributor.author | ATHREYA, RAMANA | en_US |
dc.contributor.author | Clarke, Tracy E. | en_US |
dc.contributor.author | Murgia, Matteo | en_US |
dc.contributor.author | Mazzotta, Pasquale | en_US |
dc.contributor.author | Gitti, Myriam | en_US |
dc.contributor.author | Ponman, Trevor | en_US |
dc.contributor.author | Ishwara Chandra, C. H. | en_US |
dc.contributor.author | Jones, Christine | en_US |
dc.contributor.author | Forman, William R. | en_US |
dc.date.accessioned | 2019-02-14T05:50:21Z | |
dc.date.available | 2019-02-14T05:50:21Z | |
dc.date.issued | 2011-04 | en_US |
dc.identifier.citation | Astrophysical Journal, 732(2), 95. | en_US |
dc.identifier.issn | 0004-637X | en_US |
dc.identifier.issn | 1538-4357 | en_US |
dc.identifier.uri | http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1811 | - |
dc.identifier.uri | https://doi.org/10.1088/0004-637X/732/2/95 | en_US |
dc.description.abstract | 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 gsim1 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. | en_US |
dc.language.iso | en | en_US |
dc.publisher | IOP Publishing | en_US |
dc.subject | Galaxies | en_US |
dc.subject | Active | en_US |
dc.subject | Galaxies | en_US |
dc.subject | Clusters | en_US |
dc.subject | General intergalactic medium | en_US |
dc.subject | Radio continuum | en_US |
dc.subject | Galaxies X-rays | en_US |
dc.subject | Galaxies clusters | en_US |
dc.subject | 2011 | en_US |
dc.title | A combined low-radio frequency/x-ray study of galaxy groups. I. Giant metrewave radio telescope observations at 235 MHz and 610 MHz | en_US |
dc.type | Article | en_US |
dc.contributor.department | Dept. of Physics | en_US |
dc.identifier.sourcetitle | Astrophysical Journal | en_US |
dc.publication.originofpublisher | Foreign | en_US |
Appears in Collections: | JOURNAL ARTICLES |
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