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Discovery of giant radio galaxies from NVSS: radio and infrared properties

Show simple item record Dabhade, Pratik en_US Gaikwad, Madhuri en_US Bagchi, Joydeep en_US Pandey-Pommier, M. en_US SANKHYAYAN, SHISHIR en_US Raychaudhury, Somak en_US 2019-07-01T05:55:26Z 2019-07-01T05:55:26Z 2017-05 en_US
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, 469(3), 2886-2906. en_US
dc.identifier.issn 0035-8711 en_US
dc.identifier.issn 1365-2966 en_US
dc.identifier.uri en_US
dc.description.abstract Giant radio galaxies (GRGs) are one of the largest astrophysical sources in the Universe with an overall projected linear size of ∼0.7 Mpc or more. The last six decades of radio astronomy research has led to the detection of thousands of radio galaxies. However, only ∼300 of them can be classified as GRGs. The reasons behind their large size and rarity are unknown. We carried out a systematic search for these radio giants and found a large sample of GRGs. In this paper, we report the discovery of 25 GRGs from the National Radio Astronomy Observatory Very Large Array Sky Survey, in the red-shift range z ∼ 0.07 to 0.67. Their physical sizes range from ∼0.8 Mpc to ∼4 Mpc. Eight of these GRGs have sizes ≥2 Mpc, which is a rarity. Here, for the first time, we investigate the mid-infrared (IR) properties of the optical hosts of the GRGs and classify them securely into various active galactic nuclei types using the WISE mid-IR colours. Using radio and IR data, four of the hosts of the GRGs were observed to be radio-loud quasars that extend up to 2 Mpc in radio size. These GRGs missed detection in earlier searches possibly because of their highly diffuse nature, low surface brightness and lack of optical data. The new GRGs are a significant addition to the existing sample. They will contribute to a better understanding of the physical properties of radio giants. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press en_US
dc.subject Discovery of giant radio en_US
dc.subject NVSS en_US
dc.subject Infrared properties en_US
dc.subject Galaxies en_US
dc.subject Active intergalactic medium en_US
dc.subject Galaxies en_US
dc.subject Jets, galaxies en_US
dc.subject Nuclei en_US
dc.subject Quasars en_US
dc.subject 2017 en_US
dc.title Discovery of giant radio galaxies from NVSS: radio and infrared properties en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Monthly Notices of the Royal Astronomical Society en_US
dc.publication.originofpublisher Foreign en_US

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