J/ApJ/766/20ivo://CDS.VizieR/J/ApJ/766/20doi:10.26093/cds/vizier.17660020CDSLim S.Hwang N.Lee M.G.2017-08-29T14:49:44Z2014-12-10T15:29:22ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustershst-photometryWe present a photometric study of star clusters in the nearby starburst galaxy M82 based on the UBVI-, YJ- and H-band Hubble Space Telescope images. We find 1105 star clusters with V<23mag. Of those, 1070 are located in the disk region, while 35 star clusters are in the halo region. The star clusters in the disk are composed of a dominant blue population with a color peak at (B-V)_0_~0.45, and a weaker red population. The luminosity function of the disk clusters shows a power-law distribution with a power-law index {alpha}=-2.04+/-0.03, and the scale height of their distribution is h_z_=9.64"+/-0.40" (164+/-7pc), similar to that of the stellar thin disk of M82. We have derived the ages of ~630 star clusters using the spectral energy distribution fit method by comparing UBVI(YJ)H-band photometric data with the simple stellar population models. The age distribution of the disk clusters shows that the most dominant cluster population has ages ranging from 100Myr to 1Gyr, with a peak at about 500Myr. This suggests that M82 has undergone a disk-wide star formation about 500Myr ago, probably through the interaction with M81. The brightest star clusters in the nuclear region are much brighter than those in other regions, indicating that more massive star clusters are formed in the denser environments. On the other hand, the colors of the halo clusters are similar to those of globular clusters in the Milky Way, and their ages are estimated to be older than 1Gyr. These are probably genuine old globular clusters in M82.2013ApJ...766...20Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/766/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)VI/96 : Evolutionary Sequences (Fagotto+ 1993-96)J/A+A/532/A147 : HST photometry in extragalactic star clusters (Larsen+, 2011)J/ApJ/734/L22 : ACS Nearby Galaxy Survey Treasury (Williams+, 2011)J/ApJ/679/404 : Star clusters in M82 (Mayya+, 2008)J/ApJ/667/L145 : HST Photometry of M82 region B (Smith+, 2007)J/ApJ/619/270 : Young super star clusters in M82 starburst (Melo+, 2005)J/AJ/121/768 : BVIJH photometry of M82 (de Grijs+, 2001)J/A+AS/139/393 : Young Massive Star Clusters. II. (Larsen, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/766/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/766/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/766/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/766/20https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/766/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/766/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/766/20/table2 (A catalog of the star clusters in M82)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/766/20/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/766/20/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/766/20/table2?GETtext/xml+votable180.050000true148.763291769.63963890.0055555555555555566/76063.5809191553132435e-19 3.829809573510641e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/766/20?format=asciidefaultJ/ApJ/766/20/table2A catalog of the star clusters in M82DEJ2000[69] Degree of Declination (J2000)pos.eq.dec;meta.mainSeq[1/1105] Object ID numbermeta.id;meta.mainintprimaryRAJ2000[9] Hour of Right ascension (J2000)pos.eq.ra;meta.mainVmag[16/23] HST/ACS F555W magnitude (1)magphot.mag;em.opt.Vfloate_Vmag[0.002/0.4] Uncertainty in V-band magnitudemagstat.error;phot.mag;em.opt.Vfloat(B-V)? F435W-F555W color index (1)magphot.color;em.opt.B;em.opt.Vfloatnullablee_(B-V)? Uncertainty in (B-V)magstat.errorfloatnullable(V-I)? F555W-F814W color index (1)magphot.color;em.opt.V;em.opt.Ifloatnullablee_(V-I)? Uncertainty in (V-I)magstat.errorfloatnullable(U-B)? F336W-F435W color index (1)magphot.color;em.opt.U;em.opt.Bfloatnullablee_(U-B)? Uncertainty in (U-B)magstat.errorfloatnullable(I-YJ)? F814W-F110W color index (1)magphot.color;em.IR;em.IRfloatnullablee_(I-YJ)? Uncertainty in (I-YJ)magstat.errorfloatnullable(YJ-H)? F110W-F160W color index (1)magphot.color;em.IR;em.IRfloatnullablee_(YJ-H)? Uncertainty in (YJ-H)magstat.errorfloatnullablereff[0.01/61]? Effective radius (adopted distance = 3.55Mpc)pcphys.size.radiusfloatnullablelogA[6/10.3]? Log of cluster agelog(yr)time.agefloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar