J/MNRAS/448/2530ivo://CDS.VizieR/J/MNRAS/448/2530doi:10.26093/cds/vizier.74482530CDSZhao D.Aragon-Salamanca A.Conselice C.J.2024-08-14T20:20:12Z2015-12-18T15:26:46ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxy-classification-systemsWe study a large sample of 625 low-redshift brightest cluster galaxies (BCGs) and link their morphologies to their structural properties. We derive visual morphologies and find that ~57% of the BCGs are cD galaxies, ~13% are ellipticals, and ~21% belong to the intermediate classes mostly between E and cD. There is a continuous distribution in the properties of the BCG's envelopes, ranging from undetected (E class) to clearly detected (cD class), with intermediate classes (E/cD and cD/E) showing the increasing degrees of the envelope presence. A minority (~7%) of BCGs have disc morphologies, with spirals and S0s in similar proportions, and the rest (~2%) are mergers. After carefully fitting the galaxies light distributions by using one-component (Sersic) and two-component (Sersic+Exponential) models, we find a clear link between the BCGs morphologies and their structures and conclude that a combination of the best-fitting parameters derived from the fits can be used to separate cD galaxies from non-cD BCGs. In particular, cDs and non-cDs show very different distributions in the R_e_-RFF plane, where R_e_ is the effective radius and RFF (the residual flux fraction) measures the proportion of the galaxy flux present in the residual images after subtracting the models. In general, cDs have larger R_e_ and RFF values than ellipticals. Therefore we find, in a statistically robust way, a boundary separating cD and non-cD BCGs in this parameter space. BCGs with cD morphology can be selected with reasonably high completeness (~75%) and low contamination (~20%). This automatic and objective technique can be applied to any current or future BCG sample with good-quality images.2015MNRAS.448.2530Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/2530CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/379/867 : BCG C4 cluster catalog (Von Der Linden+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/448/2530https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/2530http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/2530https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/2530https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/2530http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/2530GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/448/2530/tablea1 (Properties of the BCG sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2530/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2530/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2530/tablea1?GETtext/xml+votable180.050000true227.10734611-0.266291110.0055555555555555566/4098 4166 5097 5738 5824-5825 5855 5923 5959 5972 5979 5990-5991 6008 6030 6047 6112 6247 6269 6423 6434 6499 6504 6529 6535 6544 6546 6551-6552 6608 7223 7225 7230 7277 7316 7370 7515 7536 8199 8208-8209 9265 9270 9319 9353 9376-9377 9379 9425 9475 9504 9632 9811 9815 9914 9936 9940 9949 9953 10063 10095 10120 10147 10152-10153 10200 10202 10619 10667 10673 10704 10749 11006 11055 11101 11106 11113-11115 11129 11133 11153 11178 11240 11250 11341 11348-11349 11405 11407 11413 11415 11421 11423-11424 11426 11429 11444 11497 11590-11591 11597 11602 11778 11783-11784 11907 12380 17303 17315 17498 17564 17767 17810 17821 17832 17841 18011 18014 18022 18063 18091 18176 18410 18515 18521 18541-18542 18583 18587-18588 18597 18607-18608 18686 18842 18960 19114 19399 19424 19687 19761 19764 23192 25930 25942 25952 25958 26001 26022 26051 26061 26067 26085 26087 26164 26167 26175 26300 26302 26304 26313 26348 26389 26434 26948 27029 27045 27055 27084 27087 27109 27131 27223 27239 27314 27377 27408 27472 27480-27481 27533 27536 27544 27651 27669 27684 27686-27687 27755 27840 31323 31333 31379 31418-31419 31458 31464 48989-48990 49092https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/448/2530?format=asciiOpticaldefaultJ/MNRAS/448/2530/tablea1Properties of the BCG samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID2? SDSS-C4 number <SDSS-C4 NNNN> (1)meta.idintnullableID3SDSS C4_2003 number, <SDSS-C4-DR3 NNNN> (1)meta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshift of the clustersrc.redshiftfloatsigmaVelocity dispersion of the clusterkm/sphys.veloc.dispersionintlogRe1cEffective radius (2)log(kpc)phys.size.radiusfloatn1cSersic number (2)stat.fit.paramfloatRFF1cResidual flux fraction (2)stat.fit.paramdoublechi21cReduced chi^2^ (2)stat.fit.chi2floatMTypeVisual morphological classification of the BCGssrc.morph.typecharComSome comments from the classifiermeta.notecharSDSSDisplay the SDSS data for this galaxymeta.ref.urlcharDR4Details from the SDSS-DR4 photometric catalogmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar