J/A+A/577/A59ivo://CDS.VizieR/J/A+A/577/A59doi:10.26093/cds/vizier.35770059CDSSalinas R.Alabi A.Richtler T.Lane R.R.2017-12-22T05:32:30Z2015-05-05T07:46:39ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersvisible-astronomysloan-photometryAs tracers of star formation, galaxy assembly and mass distribution, globular clusters have provided important clues to our understanding of early-type galaxies. But their study has been mostly constrained to galaxy groups and clusters where early-type galaxies dominate, leaving the properties of the globular cluster systems (GCSs) of isolated ellipticals as a mostly uncharted territory. We present Gemini-South/GMOS g'i' observations of five isolated elliptical galaxies: NGC 3962, NGC 2865, IC 4889, NGC 2271 and NGC 4240. Photometry of their GCSs reveals clear color bimodality in three of them, remaining inconclusive for the other two. All the studied GCSs are rather poor with a mean specific frequency S_N_~1.5, independently of the parent galaxy luminosity. Considering also previous work, it is clear that bimodality and especially the presence of a significant, even dominant, population of blue clusters occurs at even the most isolated systems, casting doubts on a possible accreted origin of metal-poor clusters as suggested by some models. Additionally, we discuss the possible existence of ultra-compact dwarfs around the isolated elliptical NGC 3962.2015A&A...577A..59Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/577/A59CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/577/A59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/577/A59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/577/A59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/577/A59https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/577/A59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/577/A59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/577/A59/table1 (Basic data of the galaxies presented in this work and observation dates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/577/A59/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/577/A59/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/577/A59/table1?GETtext/xml+votable180.050000true100.720833-23.4761110.005555555555555556Cone search capability for table J/A+A/577/A59/phot (Object positions and photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/577/A59/phot?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/577/A59/phot?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/577/A59/phot?GETtext/xml+votable180.050000true100.7659583-23.50999720.0055555555555555566/20786 25383 25444 40321 40323 47187 47190 47193 471962.381800341673347e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/577/A59?format=asciiOpticaldefaultJ/A+A/577/A59/table1Basic data of the galaxies presented in this work and observation datesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharNNumber of stars observed in the galaxymeta.numberintnullableRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainMTypeMorphological type (1)src.morph.typecharBT0[11.5/14.1] Total apparent B magnitude (2)magphot.mag;em.opt.BfloatMOD[32/33] Distance modulus (m-M)_0_ (3)magphot.mag.distModfloatu_MOD[a] a: considered as uncertain by Tonry et al. (2001ApJ...546..681T)meta.code.errorcharBMAG[-21.2/-18.0] Absolute B magnitudemagphys.magAbs;em.opt.Bfloatfov[41/61] Physical size covered by the GMOS Field of View at each galaxy's distancekpcphys.angSize;instr.fovfloatObs1First observation datetime.epoch;obsnullableObs2Second observation datetime.epoch;obsnullableGalAbbreviated galaxy name, as in table phot.datmeta.idcharprimarySimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlcharJ/A+A/577/A59/photObject positions and photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalGalaxy IDmeta.id.part;meta.maincharSeq[0/687] Object sequential number within the galaxymeta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.maingmag[21.3/27.0] SDSS g magnitudemagphot.mag;em.opt.Bfloate_gmag[0.003/0.23] SDSS g magnitude errormagstat.error;phot.mag;em.opt.Bfloatimag[20.5/26.0] SDSS i magnitudemagphot.mag;em.opt.Ifloate_imag[0.004/0.22] SDSS i magnitude errormagstat.error;phot.mag;em.opt.Ifloat