J/A+A/666/A99ivo://CDS.VizieR/J/A+A/666/A99doi:10.26093/cds/vizier.36660099CDSHazra N.Cantiello M.Raimondo G.Mirabile M.Blakeslee J.P.,Branchesi M.Brocato E.2023-05-15T08:21:40Z2023-02-22T12:57:14ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustershst-photometryvisible-astronomyWe take advantage of exquisitely deep optical imaging data from the Hubble Space Telescope's Advanced Camera for Surveys (HST/ACS) in the F475W (g_F475W_) and F606W (V_F606W_) bands to study the properties of the globular cluster (GC) population in the intermediate-mass lenticular galaxy PGC 087327 in the Hydra I galaxy cluster. We inspected the photometric (magnitudes and colour) and morphometric (compactness, elongation, etc.) properties of sources lying in an area of ~19x19kpc centred on PGC 087327 and compared them with four neighbouring fields over the same HST/ACS mosaic. This allowed us to identify a list of GC candidates and to inspect their properties using a background decontamination method. Relative to four comparison fields, PGC 087327 shows a robust overdensity of GCs, N_GC_=82+/-9. At the estimated magnitude of the galaxy, this number implies a specific frequency of S_N_=1.8+/-0.7. In spite of the short wavelength interval available with the g_F475W_ and V_F606W_ passbands, the colour distribution shows a clear bimodality with a blue peak at <g_F475W_-V_F606W_>=0.47+/-0.05mag and a red peak at <g_F475W_-V_F606W_>=0.62+/-0.03mag. We also observe the typical steeper slope of the radial distribution of red GCs relative to blue ones. Thanks to the unique depth of the available data, we characterise the GC luminosity function (GCLF) well beyond the expected GCLF turnover. We find g^TOM^_F475W_=26.54+/-0.10mag and V^TOM^_F606W_=26.08+/-0.09mag, which after calibration yields a distance of D_GCLF_=56.7+/-4.3(statistical)+/-5.2(systematic)Mpc.2022A&A...666A..99Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/666/A99CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/666/A99https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/666/A99http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/666/A99https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/666/A99https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/666/A99http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/666/A99GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/666/A99/tablea2 (Globular cluster catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/666/A99/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/666/A99/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/666/A99/tablea2?GETtext/xml+votable180.050000true159.28939-27.666670.0055555555555555566/38852-38853https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/666/A99?format=asciiOpticaldefaultJ/A+A/666/A99/tablea2Globular cluster catalogSeqSequential numbermeta.recordintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Seq[*] Note on Seq (1)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maingF475WHST F475W (g) aperture and extinction corrected magnitudemagphot.mag;em.opt.Bfloate_gF475WHST F475W (g) aperture and extinction corrected magnitude errormagstat.errorfloatVF606WHST F606W (V) aperture and extinction corrected magnitudemagphot.mag;em.opt.Rfloate_VF606WHST F606W (V) aperture and extinction corrected magnitude errormagstat.errorfloatgF475W-VF606WHST F475W-F606W (g-V) colour indexmagphot.color;em.opt.B;em.opt.VfloatFradF475WFlux radius (half-light radius from SExtractor) in F475W (g) bandpixphys.angSize;srcfloatFWHMF475WFWHM in F475W (g) bandpixinstr.bandwidthfloatFradF606WFlux radius (half-light radius from SExtractor) in F606W (B) bandpixphys.angSize;srcfloatFWHMF606WFWHM in F606W (V) bandpixinstr.bandwidthfloat