J/ApJ/667/L145ivo://CDS.VizieR/J/ApJ/667/L145doi:10.26093/cds/vizier.16679145CDSSmith L.J.Bastian N.Konstantopoulos I.S.Gallagher III J.S.,Gieles M.De Grijs R.Larsen S.S.O'Connell R.W.Westmoquette M.S.2010-02-05T16:45:30Z2010-02-05T17:37:10ZCDS support team

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

cds-question@unistra.frgalaxiesstellar-associationshst-photometryWe present observations obtained with the Advanced Camera for Surveys on board the Hubble Space Telescope of the "fossil" starburst region B in the nearby starburst galaxy M82. By comparing UBVI photometry with models, we derive ages and extinctions for 35 U-band-selected star clusters. We find that the peak epoch of cluster formation occurred ~150Myr ago, in contrast to earlier work that found a peak formation age of 1.1Gyr. The difference is most likely due to our inclusion of U-band data, which are essential for accurate age determinations of young cluster populations. We further show that the previously reported turnover in the cluster luminosity function is probably due to the neglect of the effect of extended sources on the detection limit. The much younger cluster ages we derive clarifies the evolution of the M82 starburst. The M82-B age distribution now overlaps with the ages of the nuclear starburst, the clusters formed on the opposite side of the disk, and the last encounter with M81, some 220Myr ago.2007ApJ...667L.145Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/667/L145CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/293/703 : Outflow in M82 halo (McKeith+, 1995)J/AJ/121/768 : BVIJH photometry of M82 (de Grijs+, 2001)J/ApJ/619/270 : Young super star clusters in M82 starburst (Melo+, 2005)J/MNRAS/391/1384 : Deep MERLIN 5GHz radio sources in M82 (Fenech+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/667/L145https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/667/L145http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/667/L145https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/667/L145https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/667/L145http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/667/L145GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/667/L145/table1Photometry and derived parameters of the cluster sample in region Be_F814WUncertainty in F814Wmagstat.errorfloatChi? Model {chi}^2^_{nu}_ valuestat.fit.chi2floatnullableEmin? Model minimum E(F435W-F555W) color indexmagphot.color.excessfloatnullableEbest? Model best E(F435W-F555W) color indexmagphot.color.excessfloatnullableEmax? Model maximum E(F435W-F555W) color indexmagphot.color.excessfloatnullablelogAmin? Model minimum log of the agelog(yr)time.age;meta.modelled;stat.minfloatnullablelogA? Model best log of the agelog(yr)time.age;meta.modelledfloatnullablelogAmax? Model maximum log of the agelog(yr)time.age;meta.modelled;stat.maxfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[SBK2007]Running identification numbermeta.id;meta.mainintF330WHST/ACS F330W filter magnitudemagphot.mag;em.opt.Vfloate_F330WUncertainty in F330Wmagstat.errorfloatF435WHST/ACS F435W filter magnitudemagphot.mag;em.opt.Bfloate_F435WUncertainty in F435Wmagstat.errorfloatF555WHST/ACS F555W filter magnitudemagphot.mag;em.opt.Vfloate_F555WUncertainty in F555Wmagstat.errorfloatF814WHST/ACS F814W filter magnitudemagphot.mag;em.opt.Ifloat