J/A+A/649/A42ivo://CDS.VizieR/J/A+A/649/A42doi:10.26093/cds/vizier.36490042CDSChu A.Durret F.Marquez I.2023-02-04T18:11:14Z2021-05-10T08:02:47ZCDS support team

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

cds-question@unistra.frgalaxy-clustersgalaxiesvisible-astronomyinfrared-sourcesphotometryBrightest cluster galaxies (BCGs) have grown by accreting numerous smaller galaxies and can be used as tracers of cluster formation and evolution in the cosmic web. However, there is still a controversy on the main epoch of formation of BCGs, since some authors believe they have already formed before redshift z=2, while others still find them to evolve at more recent epochs. We aim to analyse the physical properties of a large sample of BCGs covering a wide redshift range up to z=1.8 and analysed in a homogeneous way, to see if their characteristics vary with redshift. As a first step, we also present a new tool to define for each cluster which galaxy is the BCG. For a sample of 137 clusters with HST images in the optical and/or infrared, we analyse the BCG properties by applying GALFIT with one or two Sersic components. For each BCG, we compute the Sersic index, effective radius, major axis position angle, surface brightness. We then search for correlations of these quantities with redshift. We find that BCGs follow the Kormendy relation (between the effective radius and the mean surface brightness), with a slope that remains constant with redshift, but with a variation with redshift of the ordinate at the origin. Although the trends are faint, we find that both the absolute magnitudes and effective radii tend to become respectively brighter and bigger with decreasing redshift. On the other hand, we find no significant correlation of the mean surface brightnesses or Sersic indices with redshift. The major axes of the cluster elongations and of the BCGs agree within 30 degrees for 73% of our clusters at redshift z<=0.9. Our results agree with the BCGs being mainly formed before redshift z=2. The alignment of the major axes of BCGs with their clusters agree with the general idea that BCGs form at the same time as clusters by accreting matter along the filaments of the cosmic web.2021A&A...649A..42Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/649/A42CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/649/A42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/649/A42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/649/A42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/649/A42https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/649/A42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/649/A42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/649/A42/table1 (Coordinates and redshifts of the BCGs detected in our samples, as well as the filters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/649/A42/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/649/A42/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/649/A42/table1?GETtext/xml+votable180.050000true0.2504-57.80930.005555555555555556Cone search capability for table J/A+A/649/A42/table4 (X-ray properties, M200 masses and position angle of the cluster if available in the litterature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/649/A42/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/649/A42/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/649/A42/table4?GETtext/xml+votable180.050000true0.25-57.80930.0055555555555555566/4215 5091 5675 5860 6047 6383 6441 6539 7178 7273 7760 7904 8291 8337-8338 8485 8921 9052 9145 9147 9149-9150 9363 9466 9476 9498 9831 10391 10513 10515-10517 10544 11080 11425 11596 16418 16426 16702 17457 17472 17686 17689 17694 17716-17717 18794-18795 18962 18966 19020 19097 19802 19848 19990 22696 22699 22771 22915 23173 25071 25327 25334 25415 25418 25451 25484 25667 25675 25990 26177 26192 26292 26676-26677 26689 26694 26915-26916 26918-26919 26927 27009 27075 27227 27883 28377 28448 28535 28622 33502 33878 34049 34059 34108 34110-34111 34196 34668-34669 34793 34954 35043 35476 35759 35933-35934 36846 39043 43945 45524 45873 45957 46005 46108 46169 46345 46353 46368 46474 47053 47430 48076 48423 48478 49012https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/649/A42?format=asciiOpticalInfrareddefaultJ/A+A/649/A42/table1Coordinates and redshifts of the BCGs detected in our samples, as well as the filtersSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharRAJ2000Right ascension (J2000) of the BCGdegpos.eq.ra;meta.mainDEJ2000Declination (J2000) of the BCGdegpos.eq.dec;meta.mainzSpectroscopic redshift of the clustersrc.redshiftdoubleClass[1/2] If two BCGs are defined for a cluster, class 1 represents the brighter of the twometa.codeintInstInstrumentmeta.id;instrcharFilterFilter used to model the luminosity profile of the BCGinstr.setup;meta.modelledcharScaleScale in units of kpc per arcseckpc/arcsecinstr.scale;arith.ratiofloatColorFilters used to compute a color to extract red sequence of the clustermeta.code;instr.filtercharJ/A+A/649/A42/table2*Parameters obtained from fitting the luminosity profiles of the BCGs with GALFIT with one Sersic or two Sersic components.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharClass[1/2] If two BCGs are defined for a cluster, class 1 represents the brighter of the twometa.codeintModelModel chosen to fit the BCG with GALFIT (Sersic* fixes n=4)stat.fit.param;meta.modelledcharMag? Absolute magnitudemagphys.magAbsfloatnullable<mue>? Mean effective surface brightnessmag.arcsec**-2phot.mag.sbfloatnullableRe? Effective radiuskpcphys.size.radiusfloatnullablen? Sersic indexstat.fit.paramfloatnullableb/a? Elongation defined as the ratio of the major to minor axisphys.angSize;arith.ratiofloatnullablePA? Position angle (anticlockwise from North)degpos.posAngintnullableAlign? Alignment of the BCG with its host clusterdegpos.posAngintnullableJ/A+A/649/A42/table3Parameters obtained for the inner component for BCGs fitted with two Sersic profilesRe-innEffective radiuskpcphys.size.radiusfloatn-innSersic indexstat.fit.paramfloatb/a-innElongation defined as the ratio of the major to minor axisdegphys.size;arith.ratiofloatPA-inn[] Position angle (anticlockwise from North)degpos.posAngintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharClass[1/2] If two BCGs are defined for a cluster, class 1 represents the brighter of the twometa.codeintMag-innAbsolute magnitudemagphys.magAbsfloat<mue>-innMean effective surface brightnessmag.arcsec**-2phot.mag.sbfloatJ/A+A/649/A42/table4X-ray properties, M200 masses and position angle of the cluster if available in the litteratureNameCluster namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000? Right ascension (J2000) of the cluster X-ray centerdegpos.eq.ra;meta.mainnullableDEJ2000? Declination (J2000) of the cluster X-ray centerdegpos.eq.dec;meta.mainnullabler_pos? Reference for the X-ray center coordinatesmeta.ref;pos.frameintnullableM200? Mass contained in a radius r200 (1)1e+14solMassphys.massfloatnullableE_M200? Mean positive error on parameter M2001e+14solMassstat.error;stat.maxfloatnullablee_M200? Mean negative error on parameter M2001e+14solMassstat.errorfloatnullableMethodM200Method used to estimate M200meta.notecharr_M200? Reference for M200meta.ref;pos.frameintnullablePAcl? Position angle of the cluster (anticlockwise from North)degpos.posAngintnullablee_PAcl? Mean error on parameter PAcldegstat.errorintnullabler_PAcl? Reference for PAclmeta.ref;pos.frameintnullableJ/A+A/649/A42/refsReferencesComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorchar