J/A+A/540/A57ivo://CDS.VizieR/J/A+A/540/A57doi:10.26093/cds/vizier.35400057CDSHussmann B.Stolte A.Brandner W.Gennaro M.Liermann A.2017-11-29T11:48:02Z2012-03-27T08:04:55ZCDS support team

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

cds-question@unistra.fropen-star-clustersearly-type-starsproper-motionsinfrared-photometrystellar-massesThe stellar mass function is a probe for a potential dependence of star formation on the environment. Only a few young clusters are known to reside within the central molecular zone and can serve as test-beds for star formation under the extreme conditions in this region. We determine the present-day mass function of the Quintuplet cluster, a young massive cluster in the vicinity of the Galactic centre. We use two epochs of high resolution near infrared imaging data obtained with NAOS/CONICA at the ESO VLT to measure the individual proper motions of stars in the Quintuplet cluster in the cluster reference frame. An unbiased sample of cluster members within a radius of 0.5pc from the cluster centre was established based on their common motion with respect to the field and a subsequent colour-cut. Initial stellar masses were inferred from four isochrones covering ages from 3 to 5Myr and two sets of stellar evolution models. For each isochrone, the present-day mass function of stars was determined for the full sample of main sequence cluster members using an equal number binning scheme. We find the slope of the present-day mass function in the central part of the Quintuplet cluster to be alpha=-1.68^+0.13^_-0.09_ for an approximate mass range from 5 to 40M_{sun}_, which is significantly flatter than the Salpeter slope of alpha=-2.35. The flattening of the present-day mass function may be caused by rapid dynamical evolution of the cluster in the strong Galactic centre tidal field. The derived mass function slope is compared to the values found in other young massive clusters in the Galaxy.2012A&A...540A..57Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/540/A57CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/494/1137 : Quintuplet cluster K-band spectral catalog (Liermann+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/540/A57https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/540/A57http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/540/A57https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/540/A57https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/540/A57http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/540/A57GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/540/A57/table4 (Catalog of stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/540/A57/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/540/A57/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/540/A57/table4?GETtext/xml+votable180.050000true266.558805-28.82686670.0055555555555555566/288308.380626262364205e-20 1.315599487115085e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/540/A57?format=asciiInfrareddefaultJ/A+A/540/A57/table4Catalog of starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.id;meta.mainintdRARight ascension offset (1)arcsecpos.eq.ra;arith.difffloatdDEDeclination offset (1)arcsecpos.eq.dec;arith.difffloatKsmagNACO VLT/CONICA Ks band magnitudemagphot.mag;em.IR.Kfloate_KsmagUncertainty of the Ks band magnitudemagstat.error;phot.mag;em.IR.KfloatHmagNACO VLT/CONICA H band magnitudemagphot.mag;em.IR.Hfloate_HmagUncertainty of the H band magnitudemagstat.error;phot.mag;em.IR.HfloatAKs? Individual extinction (2)magphys.absorptionfloatnullableComplIndividual combined completeness (3)meta.notefloatpmRAProper motion in RA*cos(DE)mas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty of pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty of pmDEmas/yrstat.error;pos.pm;pos.eq.decfloate_pmUncertainty of the absolute proper motionmas/yrstat.errorfloatSegSegment in the proper motion diagram (4)meta.notecharLHO? Identifier in the LHO catalogue (5)meta.idintnullablen_LHO[*] * for sources in the LHO catalogue which have more than one counterpartmeta.notecharSpTypeMK spectral type from the LHO cataloguesrc.spTypecharMmbCluster membership flag, 'y' for member (6)meta.code.errorcharMP3? Initial mass or interval (85-100M_{sun}_) derived from a 3Myr Padova isochrone (7)solMassphys.massfloatnullableMP3u? Upper value when interval (8)solMassphys.massintnullableMP4? Initial mass or interval (51-65M_{sun}_) derived from a 4Myr Padova Isochrone (7)solMassphys.massfloatnullableMP4u? Upper value when interval (8)solMassphys.massintnullableMP5? Initial mass or interval (37-40M_{sun}_) derived from a 5Myr Padova isochrone (7)solMassphys.massfloatnullableMP5u? Upper value when interval (8)solMassphys.massintnullableMG4? Initial mass or interval (48-60M_{sun}_) derived from a 4Myr Geneva isochrone (7)solMassphys.massfloatnullableMG4u? Upper value when interval (8)solMassphys.massintnullableSimbadSimbad column added by the CDSmeta.refchar_RAPositions, computed from offsets (dRA, dDE) (right ascension part)degpos.eq.ra;meta.main_DEPositions, computed from offsets (dRA, dDE) (declination part)degpos.eq.dec;meta.main