J/A+A/576/A14ivo://CDS.VizieR/J/A+A/576/A14doi:10.26093/cds/vizier.35760014CDSCantiello M.Capaccioli M.Napolitano N.Grado A.Limatola L.,Paolillo M.Iodice E.Romanowsky A.J.Forbes D.A.Raimondo G.,Spavone M.La Barbera F.Puzia T.H.Schipani P.2018-01-30T07:18:08Z2015-03-13T07:26:49ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersgalaxy-classification-systemsvisible-astronomysloan-photometryWe present a study of globular clusters (GCs) and other small stellar systems (SSSs) in the field of NGC 3115, observed as part of the ongoing wide-field imaging survey VEGAS, carried out with the 2.6m VST telescope. We used deep g and i observations of NGC 3115, a well-studied lenticular galaxy that is covered excellently well in the scientific literature. This is fundamental to test the methodologies, verify the results, and probe the capabilities of the VEGAS-SSS. Leveraging the large field of view of the VST allowed us to accurately study the distribution and properties of SSSs as a function of galactocentric distance, well beyond ~20 galaxy effective radii, in a way that is rarely possible. Our analysis of colors, magnitudes, and sizes of SSS candidates confirms the results from existing studies, some of which were carried out with 8-10m class telescopes, and further extends them to previously unreached galactocentric distances with similar accuracy. In particular, we find a color bimodality for the GC population and a de Vaucouleurs profile for the surface density of GCs similar to the galaxy light profile. The radial color gradient of blue and red GCs previously found, for instance, by the SLUGGS survey with Subaru and Keck data, is further extended out to the largest galactocentric radii inspected, ~65kpc. In addition, the surface density profiles of blue and red GCs taken separately are well approximated by a r1/4 density profile, with the fraction of blue GCs being slightly larger at larger radii. We do not find hints of a trend for the red GC subpopulation and for the GC turnover magnitude to vary with radius, but we observe a ~0.2mag difference in the turnover magnitude of the blue and red GC subpopulations. Finally, from inspecting SSS sizes and colors, we obtain a list of ultracompact dwarf galaxies and GC candidates suitable for future spectroscopic follow-up. In conclusion, our study shows i) the reliability of the methodologies developed to study SSSs in the field of bright early-type galaxies, and ii) the great potential of the VEGAS survey to produce original results on SSSs science, mainly thanks to the wide-field imaging adopted.2015A&A...576A..14Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/576/A14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/564/L3 : JHK photometry of NGC 3115 globular clusters (Cantiello+, 2014)J/AJ/148/32 : Globular cluster candidates in NGC 3115 (Jennings+, 2014)J/A+A/611/A93 : NGC3115 & NGC1399 VEGAS-SSS globular clusters (Cantiello+ 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/576/A14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/576/A14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/576/A14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/576/A14https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/576/A14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/576/A14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/576/A14/table3 (Positions, g and i magnitudes and sizes of the objects in the field of NGC 3115)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/576/A14/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/576/A14/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/576/A14/table3?GETtext/xml+votable180.050000true151.04014889-8.155927780.0055555555555555566/26802-26803 26808-26809https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/576/A14?format=asciiOpticaldefaultJ/A+A/576/A14/table3Positions, g and i magnitudes and sizes of the objects in the field of NGC 3115ID[4/64352] VEGAS-SSS internal designation (VEGAS-SSS-N3115-NNNNN)meta.id;meta.mainintprimaryRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainindexedRgc[0.3/37.1] Distance from centrearcminpos.angDistancefloatgmag? VST g-band magnitudemagphot.mag;em.opt.Bfloatnullablee_gmag? g-band magnitude errormagstat.error;phot.mag;em.opt.BfloatnullableCSg[0/1] Sextractor g-band Class-Star parameter (2)src.class.starGalaxyfloatimag? VST i-band magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? i-band magnitude errormagstat.error;phot.mag;em.opt.IfloatnullableCSi[0/1] Sextractor i-band Class-Star parameter (2)src.class.starGalaxyfloatg-i? VST g-i colour indexmagphot.colorfloatnullableE(B-V)[0.03/0.06] Local reddening valuemagphot.color.excessfloatS/N[4.5/6892]? Ishape S/N ratiostat.snrfloatnullableFWHM[-564/970]?=-999 Full width at half maximumarcsecspect.line.widthfloatnullableE_FWHM? FWHM positive uncertaintyarcsecstat.error;stat.maxfloatnullablee_FWHM? FWHM negative uncertaintyarcsecstat.error;phys.angSizefloatnullableRh[-3960/6879]?=-999 Half light radius form Ishape (adopted distance of NGC3115: 9.4Mpc)pcphysdoublenullableb/a[-1/1]?=-999 Object minor to major axis ratiophys.angSize;arith.ratiofloatnullableCom[0/2] Object classification, 2=best (1)meta.code.qualint