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Giant radio galaxies in the LOFAR Two-metre Sky Survey I. Radio and environmental properties

Show simple item record Dabhade, P. en_US Rottgering, H. J. A. en_US Bagchi, J. en_US Shimwell, T. W. en_US Hardcastle, M. J. en_US SANKHYAYAN, S. en_US Morganti, R. en_US Jamrozy, M. en_US Shulevski, A. en_US Duncan, K. J. en_US 2020-03-27T04:13:40Z 2020-03-27T04:13:40Z 2020-03 en_US
dc.identifier.citation Astronomy & Astrophysics, 635. en_US
dc.identifier.issn 0004-6361 en_US
dc.identifier.issn 1432-0746 en_US
dc.identifier.uri en_US
dc.description.abstract Giant radio galaxies (GRGs) are a subclass of radio galaxies, which have grown to megaparsec scales. GRGs are much rarer than normal-sized radio galaxies (< 0.7 Mpc) and the reason for their gigantic sizes is still debated. Here, we report on the biggest sample of GRGs identified to date. These objects were found in the LOFAR Two-metre Sky Survey first data release images, which cover a 424 deg2 region. Of the 239 GRGs found, 225 are new discoveries. The GRGs in our sample have sizes ranging from 0.7 Mpc to 3.5 Mpc and have redshifts (z) between 0.1 and 2.3. Seven GRGs have sizes above 2 Mpc and one has a size of ∼3.5 Mpc. The sample contains 40 GRGs hosted by spectroscopically confirmed quasars. Here, we present the search techniques employed and the resulting catalogue of the newly discovered large sample of GRGs along with their radio properties. In this paper, we also show for the first time that the spectral index of GRGs is similar to that of normal-sized radio galaxies, indicating that most of the GRG population is not dead or is not similar to a remnant-type radio galaxy. We find that 20 out of 239 GRGs in our sample are located at the centres of clusters and we present our analysis on their cluster environment and radio morphology. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Galaxies: jets en_US
dc.subject Galaxies: active en_US
dc.subject Radio continuum: galaxies en_US
dc.subject Quasars: general en_US
dc.subject TOC-MAR-2020 en_US
dc.subject 2020 en_US
dc.subject 2020-MAR-WEEK4 en_US
dc.title Giant radio galaxies in the LOFAR Two-metre Sky Survey I. Radio and environmental properties en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Astronomy & Astrophysics en_US
dc.publication.originofpublisher Foreign en_US

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