J/MNRAS/512/1294ivo://CDS.VizieR/J/MNRAS/512/1294doi:10.26093/cds/vizier.75121294CDSHannon S.Lee J.C.Whitmore B.C.Mobasher B.Thilker D.Chandar R.,Adamo A.Wofford A.Orozco-Duarte R.Calzetti D.Della Bruna L.,Kreckel K.Groves B.Barnes A.T.Boquien M.Belfiore F.Linden S.2025-05-21T20:18:29Z2025-03-28T09:28:02ZCDS support team

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

cds-question@unistra.frgalaxiesinterstellar-mediumglobular-star-clustersopen-star-clustershst-photometryultraviolet-astronomyvisible-astronomyh-i-line-emissiongalaxy-classification-systemsastrometrygalaxy-radiichemical-abundancesstar-forming-regionsstellar-massesThe analysis of star cluster ages in tandem with the morphology of their H II regions can provide insight into the processes that clear a cluster's natal gas, as well as the accuracy of cluster ages and dust reddening derived from Spectral Energy Distribution (SED) fitting. We classify 3757 star clusters in 16 nearby galaxies according to their H{alpha} morphology (concentrated, partially exposed, no emission), using Hubble Space Telescope (HST) imaging from the Legacy ExtraGalactic Ultraviolet Survey (LEGUS). We find : (1) The mean SED ages of clusters with concentrated (1-2 Myr) and partially exposed H II region morphologies (2-3 Myr) indicate a relatively early onset of gas clearing and a short (1-2 Myr) clearing time-scale. (2) The reddening of clusters can be overestimated due to the presence of red supergiants, which is a result of stochastic sampling of the IMF in low mass clusters. (3) The age-reddening degeneracy impacts the results of the SED fitting - out of 1408 clusters with M* => 5000 M_{sun}_, we find that at least 46 (3 per cent) have SED ages which appear significantly underestimated or overestimated based on H {alpha} and their environment, while the total percentage of poor age estimates is expected to be several times larger. (4) Lastly, we examine the dependence of the morphological classifications on spatial resolution. At HST resolution, our conclusions are robust to the distance range spanned by the sample (3-10 Mpc). However, analysis of ground-based H {alpha} images shows that compact and partially exposed morphologies frequently cannot be distinguished from each other.2022MNRAS.512.1294Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/512/1294CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)J/ApJ/889/154 : LEGUS & Ha-LEGUS obs. of NGC4449 star clustersJ/MNRAS/498/4906 : Pressure components in the central HII regionsJ/ApJS/212/1 : The WISE catalog of Galactic HII regions (Anderson+, 2014)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/512/1294https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/512/1294http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/512/1294https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/512/1294https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/512/1294http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/512/1294GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/512/1294/table1 (General properties for our 16 LEGUS galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/512/1294/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/512/1294/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/512/1294/table1?GETtext/xml+votable180.050000true49.5668583-66.49826110.005555555555555556Cone search capability for table J/MNRAS/512/1294/tablea1 (H{alpha} morphology classifications for detected star clusters in 16 LEGUS Galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/512/1294/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/512/1294/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/512/1294/tablea1?GETtext/xml+votable180.050000true73.57212-53.35080.0055555555555555566/2121 5142 10755 10935 10970 10976 11432 11434 16441 16605 18398 27514 28535 33193 33984 33986 34343https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/512/1294?format=asciiUVOpticalRadiodefaultJ/MNRAS/512/1294/table1General properties for our 16 LEGUS galaxiesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldLEGUS galaxy name field (Field)meta.id;meta.maincharn_FieldIndicate the galaxies studied in Hannon et al. 2019MNRAS.490.4648Hmeta.notecharMtypeMorphological type as listed in HyperLeda Makarov et al. 2014A&A...570A..13M, Cat. VII/237 (Type)src.morph.typecharDGalactic distance from Calzetti et al. 2015AJ....149...51C (Distance)Mpcpos.distance;pos.galacticfloatPAPosition angle from Lee et al. 2011ApJS..192....6L, Cat. J/ApJS/192/6 (PositionAngle)degpos.posAngintiInclination angle from Lee et al. 2011ApJS..192....6L, Cat. J/ApJS/192/6 (Inclination)degsrc.orbital.inclination;pos.posAngfloatlogD25Apparent galactic diameter with system at the isophote 25B-mag/arcsec^2^ from HyperLeda Makarov et al. 2014A&A...570A..13M, Cat. VII/237 (D_25_)log(0.1arcmin)phys.angSize;pos.galacticfloatZMetallicity used to derive physical properties as published in the LEGUS star cluster catalogues (Z) (1)phys.abund.ZfloatSFR(UV)Star formation rate from Calzetti et al. 2015AJ....149...51C (SFRUV)solMass/yrphys.SFR;em.UV.200-300nmfloatM*Stellar mass from Calzetti et al. 2015AJ....149...51C (M*)solMassphys.massdoubleNbrNumber of clusters detected in the galaxy and presented in the tablea1.datmeta.numberint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/512/1294/tablea1H{alpha} morphology classifications for detected star clusters in 16 LEGUS GalaxiesIDCluster object identifier number (ObjectID)meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXX coordinate in the LEGUS mosaics (LEGUSX)pos.cartesian.xdoubleYY coordinate in the LEGUS mosaics (LEGUSY)pos.cartesian.ydoubleRAJ2000Right ascension (J2000) (RA)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (Dec)degpos.eq.dec;meta.mainHaClass? H{alpha} classifications (H{alpha}class) (1)meta.code.class;em.line.HalphaintnullableIsolated[True False] Indicated if the cluster has neighboring clusters within 75pc, 2077 True and 1738 False cases (Isolated?)meta.codecharFieldLEGUS galaxy field (Field)src.class.starGalaxy;obs.fieldchar