J/MNRAS/450/2692ivo://CDS.VizieR/J/MNRAS/450/2692doi:10.26093/cds/vizier.74502692CDSVanderbeke JDe Propris R.De Rijcke S.Baes M.West M.J.,Blakeslee J.P.2024-08-14T20:21:48Z2015-06-08T15:54:56ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvisible-astronomysloan-photometrygalaxy-classification-systemsWe use our Galactic Globular Cluster Catalog (G2C2) photometry for 111 Galactic globular clusters (GCs) in g and z, as well as r and i photometry for a subset of 60 GCs and u photometry for 22 GCs, to determine the structural parameters assuming King models. In general, the resulting core radii are in good comparison with the current literature values. However, our half-light radii are slightly lower than the literature. The concentrations (and therefore also the tidal radii) are poorly constrained mostly because of the limited radial extent of our imaging. Therefore, we extensively discuss the effects of a limited field of view on the derived parameters using mosaicked Sloan Digital Sky Survey data, which do not suffer from this restriction. We also illustrate how red giant branch (RGB) stars in cluster cores can stochastically induce artificial peaks in the surface brightness profiles. The issues related to these bright stars are scrutinized based on both our photometry and simulated clusters. We also examine colour gradients and find that the strongest central colour gradients are caused by central RGB stars and thus not representative for the cluster light or colour distribution. We recover the known relation between the half-light radius and the Galactocentric distance in the g band, but find a lower slope for redder filters. We did not find a correlation between the scatter on this relation and other cluster properties. We find tentative evidence for a correlation between the half-light radii and the [Fe/H], with metal-poor GCs being larger than metal-rich GCs. However, we conclude that this trend is caused by the position of the clusters in the Galaxy, with metal-rich clusters being more centrally located.2015MNRAS.450.2692Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/450/2692CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/437/1725 : G2C2. I. Galactic globular clusters SDSS photometryhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/450/2692https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/450/2692http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/450/2692https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/450/2692https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/450/2692http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/450/2692GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/450/2692/sources (List of studied globular clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/450/2692/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/450/2692/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/450/2692/sources?GETtext/xml+votable180.050000true58.76125-49.61444440.0055555555555555566/3950 6389 9436 9666 10008 10321 10336 12405 12425 12531 12943 14489 16647 17121 17711 19091 20001 21017 24843 25873 27981 27986 28067 28577 28705 28717 28741 28751 28768-28769 28882 28962 28970 28974 29077 29184 29187 29195 29202 29216 29222 29231 29248 29267 29289 29294 29318 29377 29632 29636-29637 29870 30321 30323 30378 30769 30998 31019 31043 31095 31115 31417 33321 33330 33635 34242 34317 37294 38465 39642 41257 41304 41507 41522 41847 41852 42278 42314 42320 42700 42761 42955 42958 42990 43125 43227 44220 44427 47620 47777 47825 47866 47868 47916 48035 48434 48698 48952https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/450/2692?format=asciiOpticaldefaultJ/MNRAS/450/2692/sourcesList of studied globular clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGlobular cluster namemeta.id;meta.maincharprimaryRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000)pos.eq.dec;meta.mainCTIO"CTIO" origin (in table1)meta.id;instr.obstycharSDSS"SDSS" origin (in table2)meta.id;instr.obstycharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/450/2692/table1Structural King parameters based on CTIO data for 84 sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGlobular cluster namemeta.id;meta.maincharFilt[ugriz] Filter for parametersmeta.id;instr.filtercharmu0[12.8/25.1] Surface brightness in Filt (1)mag.arcsec**-2phot.mag.sbfloate_mu0[0.001/2.3] rms uncertainty on mu0 (1)mag.arcsec**-2stat.errorfloatrc[0.08/4] Core radius in Filt band (1)arcminphys.angSizefloate_rc[0/6.3] rms uncertainty on rc (1)arcminstat.errorfloatrh[0.09/4] Half-light radius in Filt band (1)arcminphys.size.radiusfloate_rh[0/0.6] rms uncertainty on rh (1)arcminstat.errorfloatmagModel magnitude in Filt band computed within the listed rhmagphot.magfloatmag.rAperture magnitude in Filt band computed within the listed rhmagphot.magfloattexp[60/410]? CTIO exposure time in Filt bandstime.duration;obs.exposurefloatnullablechi2[0/3.5] Reduced {chi}^2^ value in Filt bandinstr.bandpassfloatdof[4/63] Degrees of freedom in Filt bandstat.fit.dof;instr.bandpassintfit[0/1] Flag indicates if the central SB point was included by the final fitmeta.codeintJ/MNRAS/450/2692/table2Globular cluster King parameters based on SDSS data for 19 sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGlobular cluster namemeta.id;meta.maincharFilt[ugriz] Filter for parametersmeta.id;instr.filtercharmu0[12.8/25.1] Surface brightness in Filt (1)mag.arcsec**-2phot.mag.sbfloate_mu0[0.001/2.3] rms uncertainty on mu0 (1)mag.arcsec**-2stat.errorfloatrc[0.08/4] Core radius in Filt band (1)arcminphys.angSizefloate_rc[0/6.3] rms uncertainty on rc (1)arcminstat.errorfloatrh[0.09/4] Half-light radius in Filt band (1)arcminphys.size.radiusfloate_rh[0/0.6] rms uncertainty on rh (1)arcminstat.errorfloatmagModel magnitude in Filt band computed within the listed rhmagphot.magfloatmag.rAperture magnitude in Filt band computed within the listed rhmagphot.magfloatchi2[0/3.5] Reduced {chi}^2^ value in Filt bandinstr.bandpassfloatdof[4/63] Degrees of freedom in Filt bandstat.fit.dof;instr.bandpassintfit[0/1] Flag indicates if the central SB point was included by the final fitmeta.codeint