Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1811
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dc.contributor.authorGiacintucci, Simonaen_US
dc.contributor.authorO'Sullivan, Ewanen_US
dc.contributor.authorVrtilek, Janen_US
dc.contributor.authorDavid, Laurence P.en_US
dc.contributor.authorRaychaudhury, Somaken_US
dc.contributor.authorVenturi, Tizianaen_US
dc.contributor.authorATHREYA, RAMANAen_US
dc.contributor.authorClarke, Tracy E.en_US
dc.contributor.authorMurgia, Matteoen_US
dc.contributor.authorMazzotta, Pasqualeen_US
dc.contributor.authorGitti, Myriamen_US
dc.contributor.authorPonman, Trevoren_US
dc.contributor.authorIshwara Chandra, C. H.en_US
dc.contributor.authorJones, Christineen_US
dc.contributor.authorForman, William R.en_US
dc.date.accessioned2019-02-14T05:50:21Z
dc.date.available2019-02-14T05:50:21Z
dc.date.issued2011-04en_US
dc.identifier.citationAstrophysical Journal, 732(2), 95.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.issn1538-4357en_US
dc.identifier.urihttp://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/1811-
dc.identifier.urihttps://doi.org/10.1088/0004-637X/732/2/95en_US
dc.description.abstractWe 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.isoenen_US
dc.publisherIOP Publishingen_US
dc.subjectGalaxiesen_US
dc.subjectActiveen_US
dc.subjectGalaxiesen_US
dc.subjectClustersen_US
dc.subjectGeneral intergalactic mediumen_US
dc.subjectRadio continuumen_US
dc.subjectGalaxies X-raysen_US
dc.subjectGalaxies clustersen_US
dc.subject2011en_US
dc.titleA combined low-radio frequency/x-ray study of galaxy groups. I. Giant metrewave radio telescope observations at 235 MHz and 610 MHzen_US
dc.typeArticleen_US
dc.contributor.departmentDept. of Physicsen_US
dc.identifier.sourcetitleAstrophysical Journalen_US
dc.publication.originofpublisherForeignen_US
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