J/MNRAS/423/422ivo://CDS.VizieR/J/MNRAS/423/422doi:10.26093/cds/vizier.74230422CDSLiu F.S.Mao S.Meng X.M.2024-07-18T20:18:29Z2013-11-20T15:03:09ZCDS support team

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

cds-question@unistra.frgalaxy-clustersspectroscopyredshiftedWe identify a total of 120 early-type brightest cluster galaxies (BCGs) at 0.1<z<0.4 in two recent large cluster catalogues selected from the Sloan Digital Sky Survey (SDSS). They are selected with strong emission lines in their optical spectra, with both H{alpha} and [OII]{lambda}3727 line emission, which indicates significant ongoing star formation. They constitute about ~0.5 per cent of the largest, optically selected, low-redshift BCG sample, and the fraction is a strong function of cluster richness. Their star formation history can be well described by a recent minor and short starburst superimposed on an old stellar component, with the recent episode of star formation contributing on average only less than 1 per cent of the total stellar mass. We show that the more massive star-forming BCGs in richer clusters tend to have higher star formation rate (SFR) and specific SFR (SFR per unit galaxy stellar mass). We also compare their statistical properties with a control sample selected from X-ray luminous clusters, and show that the fraction of star-forming BCGs in X-ray luminous clusters is almost one order of magnitude larger than that in optically selected clusters. BCGs with star formation in cooling flow clusters usually have very flat optical spectra and show the most active star formation, which may be connected with cooling flows.2012MNRAS.423..422Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/423/422CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/183/197 : Galaxy clusters identified from the SDSS-DR6 (Wen+, 2009)J/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS-DR7 (Hao+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/423/422https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/423/422http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/423/422https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/423/422https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/423/422http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/423/422GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/423/422/table1 (Basic parameters for the 120 identified early-type BCGs with ongoing star formation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/423/422/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/423/422/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/423/422/table1?GETtext/xml+votable180.050000true11.838660.877680.0055555555555555566/4113 4171 4206 4486 4503 4587 4692 4952 4991 4998 5105 5141 5260 5307 5371 5506 5606 5618 5622 5762 5929 6084 6104 6433 6606 6643 7243 7395 7540 7596 8237 8256 8338 8367 8427 8454 8596 8751 8911 8924 8926 8949 8963 8969 8988 9026 9052 9254 9261 9381 9438 9473 9823 9844 9879 9991 10024 10180 10331 10420 10450 10548 10565 10636 10758 10764 10798 10821 10909 10935 11136 11321 11468 11472 12392 17818 18113 18778 18798 19049 19097 22006 23146 25855 25931 26037 26052 26054 26252 26322 26357 26404 26460 26979 27291 27428 27458 27470 27478 27528 27579 27611 27619 27632 28057 28220 28385 28449 28490 28587 28615 31668 31713 32437 32500-32501 36791 45044 49094https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/423/422?format=asciiOpticaldefaultJ/MNRAS/423/422/table1Basic parameters for the 120 identified early-type BCGs with ongoing star formationSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterSDSS-WHL cluster name or GMBCG cluster namemeta.id;meta.maincharn_ClusterNote on Cluster (1)meta.notecharXClusterX-ray cluster namemeta.idcharRAJ2000Brightest galaxy right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Brightest galaxy (BCG) declination (J2000)degpos.eq.dec;meta.mainzBCGSpectroscopic redshift of the BCGsrc.redshift;pos.heliocentricfloatlogM*fStellar mass inside the fibre aperturelog(solMass)phys.massfloatlogM*tTotal stellar masslog(solMass)phys.massfloatF[NII]Flux of [NII]{lambda}6584 line (2)1e-20W.m**-2phot.flux;spect.linefloatFHaFlux of H{alpha} line (2)1e-20W.m**-2phot.flux;em.line.Halpha;spect.linefloatF[OIII]Flux of [OIII]{lambda}5007 line (2)1e-20W.m**-2phot.flux;em.line.OIII;spect.linefloatFHbFlux of H{beta} line (2)1e-20W.m**-2phot.flux;em.line.HbetafloatF[OII]Flux of [OII]{lambda}3727 line (2)1e-20W.m**-2phot.flux;spect.linedoubleSFRaDerived SFR by the H{alpha} emission linesolMass/yrphys.SFRfloatSFRoDerived SFR by the [OII] emission linesolMass/yrphys.SFRfloatDn(4000)Amplitude of the Balmer break D_n_(4000{AA})spect.indexfloatHdAAbsorption line index H{delta}Aspect.indexfloatClassGalaxy type classified by the BPT diagnostic diagrams: sb (starburst) or comp (composite)src.classchar