J/AJ/148/32ivo://CDS.VizieR/J/AJ/148/32doi:10.26093/cds/vizier.51480032CDSJennings Z.G.Strader J.Romanowsky A.J.Brodie J.P.Arnold J.A.,Lin D.Irwin J.A.Sivakoff G.R.Wong K.-W.2018-02-12T08:45:33Z2014-11-06T06:21:14ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryWe present Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) g and z photometry and half-light radii R_h_ measurements of 360 globular cluster (GC) candidates around the nearby S0 galaxy NGC 3115. We also include Subaru/Suprime-Cam g, r, and i photometry of 421 additional candidates. The well-established color bimodality of the GC system is obvious in the HST/ACS photometry. We find evidence for a "blue tilt" in the blue GC subpopulation, wherein the GCs in the blue subpopulation get redder as luminosity increases, indicative of a mass-metallicity relationship. We find a color gradient in both the red and blue subpopulations, with each group of clusters becoming bluer at larger distances from NGC 3115. The gradient is of similar strength in both subpopulations, but is monotonic and more significant for the blue clusters. On average, the blue clusters have ~10% larger R_h_than the red clusters. This average difference is less than is typically observed for early-type galaxies but does match that measured in the literature for the Sombrero Galaxy (M104), suggesting that morphology and inclination may affect the measured size difference between the red and blue clusters. However, the scatter on the R_h_ measurements is large. We also identify 31 clusters more extended than typical GCs, which we term ultra-compact dwarf (UCD) candidates. Many of these objects are actually considerably fainter than typical UCDs. While it is likely that a significant number will be background contaminants, six of these UCD candidates are spectroscopically confirmed as NGC 3115 members. To explore the prevalence of low-mass X-ray binaries in the GC system, we match our ACS and Suprime-Cam detections to corresponding Chandra X-ray sources. We identify 45 X-ray-GC matches: 16 among the blue subpopulation and 29 among the red subpopulation. These X-ray/GC coincidence fractions are larger than is typical for most GC systems, probably due to the increased depth of the X-ray data compared to previous studies of GC systems.2014AJ....148...32Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/148/32CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/564/L3 : JHK photometry of NGC 3115 GCs (Cantiello+, 2014)J/MNRAS/428/389 : SLUGGS globular clusters in early-type galaxies (Pota+, 2013)J/MNRAS/416/155 : Globular clusters in five early-type galaxies (Faifer+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/148/32https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/148/32http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/148/32https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/148/32https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/148/32http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/148/32GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/148/32/table3 (Ultra-compact dwarf candidates in ACS data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/32/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/32/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/32/table3?GETtext/xml+votable180.050000true151.30216-7.73556940.005555555555555556Cone search capability for table J/AJ/148/32/table2 (Advanced Camera for Surveys (ACS) and SuprimeCam globular cluster candidate catalog (2017-11-06 version))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/148/32/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/148/32/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/148/32/table2?GETtext/xml+votable180.050000true151.3156889-7.71432190.0055555555555555566/26803 26809 27529 27531 27532 275342.1350832807657816e-19 4.369938604086476e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/148/32?format=asciiInfraredOpticaldefaultJ/AJ/148/32/table3Ultra-compact dwarf candidates in ACS datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintUCD[1/31] Number of the Ultra-Compact Dwarf candidate <[JSR2014] UCDNNN> in Simbadmeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainF475HST/ACS F475W band magnitude (G1)magphot.mag;em.opt.Bfloate_F475Uncertainty in F475 (G2)magstat.errorfloatF850HST/ACS F850LP band magnitude (G1)magphot.mag;em.opt.Ifloate_F850Uncertainty in F850 (G2)magstat.errorfloatRad[8/81] Half-light radiuspcphys.size.radiusfloatHV[393/878]? Heliocentric velocity (G3)km/sspect.dopplerVeloc.opt;pos.heliocentricintnullableX[YN] Indicates whether or not the globular cluster candidate hosts an X-ray source (Yes or No)meta;em.X-raycharP13Cross-match with Pota et al. 2013 (J/MNRAS/428/389) within 1.5"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/148/32/table2Advanced Camera for Surveys (ACS) and SuprimeCam globular cluster candidate catalog (2017-11-06 version)e_imag? Uncertainty in imagmagstat.error;phot.mag;em.opt.IfloatnullableRad[0/7.2]? Half-light radiuspcphys.size.radiusfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintr_Cluster[AS] A=HST/ACS imaging, S=Suprime-Cam photometrymeta.ref;pos.framecharCluster[1/781] Number of the globular cluster candidate <[JSR2014] ANNN> in Simbadmeta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainF475? HST/ACS F475W band magnitude (G1)magphot.mag;em.opt.Bfloatnullablee_F475? Uncertainty in F475 (G2)magstat.errorfloatnullableF850? HST/ACS F850LP band magnitude (G1)magphot.mag;em.opt.Ifloatnullablee_F850? Uncertainty in F850 (G2)magstat.errorfloatnullablegmag? Subaru/Suprime-Cam g band magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag? Uncertainty in gmagmagstat.error;phot.mag;em.opt.Bfloatnullablermag? Subaru/Suprime-Cam r band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? Uncertainty in rmagmagstat.error;phot.mag;em.opt.Rfloatnullableimag? Subaru/Suprime-Cam i band magnitudemagphot.mag;em.opt.IfloatnullableHV[71/1192]? Heliocentric velocity (G3)km/sspect.dopplerVeloc.opt;pos.heliocentricfloatnullableX[YN] Indicates whether or not the globular cluster candidate hosts an X-ray source (Yes or No)meta;em.X-raycharP13Cross-match with Pota et al. 2013 (J/MNRAS/428/389) within 1.5"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar