J/A+A/635/A5ivo://CDS.VizieR/J/A+A/635/A5doi:10.26093/cds/vizier.36350005CDSDabhade P.Roettgering H.J.A.Bagchi J .Shimwell T.W.Hardcastle M.J.,Sankhyayan S.Morganti R.Jamrozy M.Shulevski A.Duncan K.J.2022-03-02T11:49:28Z2020-02-28T08:17:42ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-galaxiesredshiftedgalaxy-classification-systemsGiant radio galaxies (GRGs) are a subclass of radio galaxies, which have grown to megaparsec scales. GRGs are much rarer than normal-sized radio galaxies (<0.7Mpc) 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 (LoTSS) first data release images, which cover a 424 deg^2^ region. Of the 239 GRGs found, 225 are new discoveries. The GRGs in our sample have sizes ranging from 0.7Mpc to 3.5Mpc and have redshifts (z) between 0.1 and 2.3. Seven GRGs have sizes above 2Mpc and one has a size of ~3.5Mpc. 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.2020A&A...635A...5Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/635/A5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS DR7 (Hao+, 2010)J/ApJS/199/34 : Clusters of galaxies in SDSS-III (Wen+, 2012)J/A+A/622/A1 : LOFAR Two-metre Sky Survey DR1 source catalog (Shimwell+ 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/635/A5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/635/A5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/635/A5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/635/A5https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/635/A5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/635/A5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/635/A5/tablea1 (All of the 239 GRGs found from the LoTSS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/635/A5/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/635/A5/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/635/A5/tablea1?GETtext/xml+votable180.050000true164.27262553.44021940.005555555555555556Cone search capability for table J/A+A/635/A5/tablea2 (LoTSS GRGs in galaxy clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/635/A5/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/635/A5/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/635/A5/tablea2?GETtext/xml+votable180.050000true170.360166753.74908610.0055555555555555566/5501-5502 5566-5567 5575 5582-5583 5592 5598 5602 5612 5614 5616 5626-5627 5909 5911 5916 5918 5940 5943 5951-5952 5954 5957 5959-5960 5962 5964 5967 5980 5987-5988 5994 5996-5998 6008 6039 10615 10619 10621 10685 10687 10695 10701 10703 10708-10710 10712-10713 10715-10716 10721-10722 10724 10731-10732 10734 10742 10745 10748 10750 10942 10957 10961 10967 10972 10974-10975 10977 10980-10981 10983-10984 10986-10987 10989 10993 10995-10996 10998-11002 11021 11023 11025-11026 11030-11033 11035-11036 11038-11039 11042 11045 11053 11057 11060 11064 11066 11069-11072 11074 11076 11078 11083 11087 11091 11096 11099 11101-11102 11106 11109 11112 11114 11116 11118-11120 11137 11140 11144-11145 11148 11150-11151 11154 11157 11160 11169-11172 11176 11183 11200 11290 11299 11301 11304 11306 11308 11310 11315-11316 11319 11321-11324 11338-11339 11361 11368 11393 11395-11397 11399 11401 11403-11404 11406 11408-11409 11411-11412 11414 11416 11420 11422-11423 11425 11429-11430 11432 11434-11436 11438 11440 11464 117799.54153977050123e-26 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/635/A5?format=asciiOpticalRadiodefaultJ/A+A/635/A5/tablea1All of the 239 GRGs found from the LoTSSzRedshiftsrc.redshiftdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSrNoSequential numbermeta.recordintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainClass[GQ] type of host of the GRG (1)meta.code.classchare_zrms uncertainty on redshiftstat.error;src.redshiftdoubleSimbadSimbad column added by the CDSmeta.ref.urlcharn_zRedshift type and origin (2)meta.notecharSizeAngular sizearcsecphys.angSizeintSizePProjected linear sizeMpcphys.sizefloatS144MHzIntegrated flux at 144MHzmJyphot.flux.density;em.radio.100-200MHzinte_S144MHzrms uncertainty on integrated flux at 144MHzmJystat.errorintP144MHzRadio power at 144MHz1e+26W.Hz**-1phys.luminosity;em.radio.100-200MHzfloate_P144MHzrms uncertainty on radio power at 144MHz1e+26W.Hz**-1stat.errorfloatl_SI[<] Limit flag on SImeta.code.errorcharSI? Integrated spectral index computed between 1400MHz (NVSS) flux and 144MHz (LoTSS) fluxesphot.flux;em.radio.750-1500MHzfloatnullablee_SI? rms uncertainty on SIstat.errorfloatnullableFRMorphological type of the GRG (3)meta.codecharrmagr band magnitude of the host galaxies of the GRGs obtained from SDSS (4)magphot.mag;em.opt.Rfloate_rmagrms uncertainty on rmagmagstat.error;phot.magfloatRef? Reference for the GRGs already known in literature (5)meta.ref;pos.frameintnullableJ/A+A/635/A5/tablea2LoTSS GRGs in galaxy clustersSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSrNo[1/20] Sequential numbermeta.recordintClusterCluster name (1)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainzspSpectroscopic redshiftsrc.redshiftdoublee_zsprms uncertainty on zspstat.errordoublen_zsp[*] * for photometric redshift in zspmeta.notecharr200? Radius within which the mean density of a cluster is 200 times of the critical density of the Universe (2)Mpcphys.size.radiusfloatnullableRL*? Cluster richness parameter (2)src.class.richnessfloatnullableM200? Mass of the cluster within r200 (3)1e+14solMassphys.massfloatnullableN200? Number of galaxies within r200meta.numberintnullable