J/ApJ/841/92ivo://CDS.VizieR/J/ApJ/841/92doi:10.26093/cds/vizier.18410092CDSRyon J.E.Gallagher J.S.Smith L.J.Adamo A.Calzetti D.Bright S.N.,Cignoni M.Cook D.O.Dale D.A.Elmegreen B.E.Fumagalli M.,Gouliermis D.A.Grasha K.Grebel E.K.Kim H.Messa M.Thilker D.,Ubeda L.2020-01-28T15:09:27Z2018-02-19T11:29:50ZCDS support team

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

cds-question@unistra.frgalaxiesstellar-associationsstellar-agesstellar-massesWe present a study of the effective (half-light) radii and other structural properties of a systematically selected sample of young, massive star clusters (>=5x10^3^M_{sun}_ and <=200Myr) in two nearby spiral galaxies, NGC 628 and NGC 1313. We use Hubble Space Telescope (HST) WFC3/UVIS and archival ACS/WFC data obtained by the Legacy Extragalactic UV Survey (LEGUS), an HST Treasury Program. We measure effective radii with GALFIT, a two- dimensional image-fitting package, and with a new technique to estimate effective radii from the concentration index of observed clusters. The distribution of effective radii from both techniques spans ~0.5-10pc and peaks at 2-3pc for both galaxies. We find slight positive correlations between effective radius and cluster age in both galaxies, but no significant relationship between effective radius and galactocentric distance. Clusters in NGC 1313 display a mild increase in effective radius with cluster mass, but the trend disappears when the sample is divided into age bins. We show that the vast majority of the clusters in both galaxies are much older than their dynamical times, suggesting they are gravitationally bound objects. We find that about half of the clusters in NGC 628 are underfilling their Roche lobes, based on their Jacobi radii. Our results suggest that the young, massive clusters in NGC 628 and NGC 1313 are expanding, due to stellar mass loss or two-body relaxation, and are not significantly influenced by the tidal fields of their host galaxies.2017ApJ...841...92Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/841/92CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/139/393 : Young Massive Star Clusters. II. (Larsen, 1999)J/A+A/416/537 : UBVI & HST photom. of young stellar clusters (Larsen, 2004)J/ApJS/161/304 : Star clusters in the MW & satellites (McLaughlin+, 2005)J/AJ/131/2478 : M31 and M33 UBVRI photometry (Massey+, 2006)J/ApJS/173/538 : XUV-Disk galaxies in the Local Universe (Thilker+, 2007)J/AJ/138/1667 : HST survey of young clusters in M31. III. (Barmby+, 2009)J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009)J/A+A/501/949 : Star cluster properties in 5 spiral galaxies (Mora+, 2009)J/MNRAS/401/1965 : Globular clusters in M104 (Harris+, 2010)J/AJ/140/75 : Antennae galaxies (NGC4038/4039) revisited (Whitmore+, 2010)J/A+A/529/A25 : Star cluster photom. in 5 nearby gal. (Silva-Villa+, 2011)J/MNRAS/452/525 : M83 young star cluster light profiles (Ryon+, 2015)J/ApJ/806/16 : CHemical Abundances of Spirals. I. NGC628 (Berg+, 2015)J/ApJ/812/147 : Slug analysis of star clusters in NGC628+7793 (Krumholz+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/841/92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/841/92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/841/92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/841/92https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/841/92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/841/92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/841/92/table3 (Properties of young massive clusters (YMCs) in NGC 628)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/841/92/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/841/92/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/841/92/table3?GETtext/xml+votable180.050000true24.1691215.803960.005555555555555556Cone search capability for table J/ApJ/841/92/table4 (Properties of young massive clusters (YMCs) in NGC 1313)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/841/92/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/841/92/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/841/92/table4?GETtext/xml+votable180.050000true49.61172-66.456830.0055555555555555566/18398 33193https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/841/92?format=asciidefaultJ/ApJ/841/92/table3Properties of young massive clusters (YMCs) in NGC 628IDObject identifiermeta.id;meta.maincharE_logAgePositive error on log agelog(yr)stat.error;stat.maxfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainCI[1.3/2.3] Concentration index in magnitudesmagphot.mag;arith.difffloateta[1/9.3]? Power-law slope of EFF light profile (1)stat.fit.paramfloatnullablee_eta[0.01/80]? Error in etastat.error;phys.electron.degenfloatnullablelogReffg[-0.6/15.5]? Log of half-light radius from GALFITlog(pc)phys.size.radiusfloatnullableE_logReffg? Positive error in log Reff from GALFITlog(pc)stat.error;stat.maxfloatnullablee_logReffg? Negative error in log Reff from GALFITlog(pc)stat.errorfloatnullablelogReffc[-0.6/1.3] Log of half-light radius from CIlog(pc)phys.size.radiusfloatE_logReffcPositive error in log Reff from CIlog(pc)stat.error;stat.maxfloate_logReffcNegative error in log Reff from CIlog(pc)stat.errorfloatlogAge[6/8.3] Log of agelog(yr)time.agefloate_logAgeNegative error on log agelog(yr)stat.error;time.agefloatlogMass[3.7/5.7] Log of masslog(solMass)phys.massfloatE_logMassPositive error on log masslog(solMass)stat.error;stat.maxfloate_logMassNegative error on log masslog(solMass)stat.error;phys.massfloatfvis[1/2] Visual inspection class, mode (2)meta.codeintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/841/92/table4Properties of young massive clusters (YMCs) in NGC 1313IDObject identifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainCI[1.3/2.3] Concentration index in magnitudesmagphot.mag;arith.difffloateta[1/9.3]? Power-law slope of EFF light profile (1)stat.fit.paramfloatnullablee_eta[0.01/80]? Error in etastat.error;phys.electron.degenfloatnullablelogReffg[-0.6/15.5]? Log of half-light radius from GALFITlog(pc)phys.size.radiusfloatnullableE_logReffg? Positive error in log Reff from GALFITlog(pc)stat.error;stat.maxfloatnullablee_logReffg? Negative error in log Reff from GALFITlog(pc)stat.errorfloatnullablelogReffc[-0.6/1.3] Log of half-light radius from CIlog(pc)phys.size.radiusfloatE_logReffcPositive error in log Reff from CIlog(pc)stat.error;stat.maxfloate_logReffcNegative error in log Reff from CIlog(pc)stat.errorfloatlogAge[6/8.3] Log of agelog(yr)time.agefloatE_logAgePositive error on log agelog(yr)stat.error;stat.maxfloate_logAgeNegative error on log agelog(yr)stat.error;time.agefloatlogMass[3.7/5.7] Log of masslog(solMass)phys.massfloatE_logMassPositive error on log masslog(solMass)stat.error;stat.maxfloate_logMassNegative error on log masslog(solMass)stat.error;phys.massfloatfvis[1/2] Visual inspection class, mode (2)meta.codeintSimbadSimbad column added by the CDSmeta.ref.urlchar