J/ApJ/939/74ivo://CDS.VizieR/J/ApJ/939/74doi:10.26093/cds/vizier.19390074CDSKang J.Lee M.G.Jang In S.Ko Y.Sohn J.Hwang N.Park B.-G.2025-02-18T20:14:27Z2024-11-20T08:05:54ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersinfrared-photometryvisible-astronomybroad-band-photometrytwo-color-diagramsM104 (NGC 4594, the Sombrero galaxy) is a mysterious massive early-type galaxy that shows a dominant bulge and a prominent disk. However, the presence of a halo in M104 has been elusive, and it is not yet known how M104 has acquired such a peculiar structure. Using wide (~2deg^2^) and deep ugi images of M104 obtained with the CFHT/MegaCam, we detect a large number of globular clusters (GCs) found out to R~35' (~100kpc). The color distribution of these GCs shows two subpopulations: a blue (metal-poor) system and a red (metal-rich) system. The total number of GCs is estimated to be N_GC_=1610+/-30 and the specific frequency to be SN=1.8+/-0.1. The radial number density profile of the GCs is steep in the inner region at R<20' and becomes shallow in the outer region at 20'<R<35'. The outer region is dominated by blue GCs and is extended out to R~35'. This shows clearly the existence of a giant metal-poor halo in M104. The inner region is composed of a bulge hosting a disk, corresponding to a metal-rich halo as seen in early-type galaxies. At least two clumps of blue GCs are found in the outer region. One clump is overlapped with a faint stellar stream located in the southwest, indicating that it may be a remnant of a disrupted dwarf galaxy. Our results imply that the metal-rich inner halo of M104 formed first via major mergers, and the metal-poor outer halo grew via numerous minor mergers.2022ApJ...939...74Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/939/74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)VII/195 : Globular Clusters in the Milky Way (Harris, 1996)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)J/MNRAS/313/469 : Streaming motions of galaxy clusters. I. (Smith+, 2000)J/MNRAS/327/1116 : VI photometry of Sombrero globular clusters (Larsen+, 2001)J/MNRAS/365/1357 : Absolute mag. of Globular Cluster (Di Criscienzo+, 2006)J/AJ/132/1593 : BVR phot. of NGC 4594 globular clusters (Spitler+, 2006)J/ApJ/681/197 : ACS Virgo Cluster Survey. XV (Peng+, 2008)J/ApJS/183/1 : Catalog of central stellar velocity dispersions (Ho+, 2009)J/MNRAS/401/1965 : Globular clusters in M104 (Harris+, 2010)J/MNRAS/412/2498 : Galaxy group & clouds in the local universe (Makarov+, 2011)J/ApJ/772/82 : A catalog of globular cluster systems (Harris+, 2013)J/ApJ/773/L27 : GCs in ACSVCS early-type galaxies (Park+, 2013)J/AJ/147/150 : Velocities of globular clusters in M104 (Dowell+, 2014)J/ApJS/217/32 : S4G galaxy morphologies in the CVRHS system (Buta+, 2015)J/ApJ/835/123 : Globular clusters in NGC 474 from CFHT obs. (Lim+, 2017)J/ApJ/872/202 : CFHT ugi photometry of globular clusters in M85 (Ko+, 2019)J/ApJ/871/33 : BVI phot. catalog of star clusters in NGC4589 (Lee+, 2019)J/ApJ/891/144 : CFHT dwarf satellite gal. around LV hosts (Carlsten+, 2020)J/ApJ/899/140 : 632 Gaia Ultracompact Dwarf galaxy cand. (Voggel+, 2020)J/ApJ/914/16 : NGC 5128 GCs from PISCes, Gaia DR2 and NSC (Hughes+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/939/74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/939/74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/939/74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/939/74https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/939/74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/939/74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/939/74/table4 (A ugi photometric catalog of the globular clusters (GCs) in M104)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/939/74/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/939/74/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/939/74/table4?GETtext/xml+votable180.050000true189.40932-11.583560.0055555555555555565/6270 6/250862.4270961532559724e-19 2.8962881395294825e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/939/74?format=asciiOpticalInfrareddefaultJ/ApJ/939/74/table4A ugi photometric catalog of the globular clusters (GCs) in M104recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[189.4/190.6] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-12.21/-11] Declination (J2000)degpos.eq.dec;meta.mainimag[18.1/24.9] CFHT/MegaCam apparent i-band AB magnitudemagphot.mag;em.opt.Ifloate_imag[0.06/0.2] Uncertainty in imagmagstat.error;phot.mag;em.opt.Ifloatg-i[0.58/1.3] The (g-i) color indexmagphot.color;em.opt.B;em.opt.Ifloatu-g[0.85/1.95] The (u-g) color indexmagphot.color;em.opt.U;em.opt.Bfloate_u-g[0.14/3.2] Uncertainty in u-gmagstat.error;phot.colorfloatCi[0.3/0.6] The i-band concentration indexmagphot;em.opt.IfloatSeq[1/2936] Running sequence numbermeta.id;meta.maininte_g-i[0.08/0.4] Uncertainty in g-imagstat.error;phot.colorfloat