J/ApJ/826/32ivo://CDS.VizieR/J/ApJ/826/32doi:10.26093/cds/vizier.18260032CDSMulia A.J.Chandar R.Whitmore B.C.2017-01-23T22:00:00Z2016-10-21T13:26:13ZCDS support team

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

cds-question@unistra.frhst-photometrygalaxiesvisible-astronomyWe use the Advanced Camera for Surveys on the Hubble Space Telescope to study the rich population of young massive star clusters in the main body of NGC 3256, a merging pair of galaxies with a high star formation rate (SFR) and SFR per unit area ({Sigma}_SFR_). These clusters have luminosity and mass functions that follow power laws, dN/dL{propto}L^{alpha}^ with {alpha}=-2.23+/-0.07, and dN/dM{propto}M^{beta}^ with {beta}=-1.86+/-0.34 for {tau}<10Myr clusters, similar to those found in more quiescent galaxies. The age distribution can be described by dN/d{tau}{propto}{tau}^{gamma}^, with {gamma}~-0.67+/-0.08 for clusters younger than about a few hundred million years, with no obvious dependence on cluster mass. This is consistent with a picture where ~80% of the clusters are disrupted each decade in time. We investigate the claim that galaxies with high {Sigma}_SFR_ form clusters more efficiently than quiescent systems by determining the fraction of stars in bound clusters ({Gamma}) and the CMF/SFR statistic (CMF is the cluster mass function) for NGC 3256 and comparing the results with those for other galaxies. We find that the CMF/SFR statistic for NGC 3256 agrees well with that found for galaxies with {Sigma}_SFR_ and SFRs that are lower by 1-3 orders of magnitude, but that estimates for {Gamma} are only robust when the same sets of assumptions are applied. Currently, {Gamma} values available in the literature have used different sets of assumptions, making it more difficult to compare the results between galaxies.2016ApJ...826...32Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/826/32CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/805/99 : Ages of star clusters in tidal tails of 3 gal. (Mulia+, 2015)J/MNRAS/430/676 : Massive clusters in the LMC (Baumgardt+, 2013)J/A+A/529/A25 : Photom. of star clusters in 5 galaxies (Silva-Villa+, 2011)J/MNRAS/405/857 : Star clusters in NGC 3256 (Goddard+, 2010)J/ApJ/706/599 : H{alpha} and UV SFR in the local volume (Lee+, 2009)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/AJ/127/1531 : Star formation history of SMC (Harris+, 2004)J/AJ/118/752 : BI photom. of NGC 3256 young globular clusters (Zepf+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/826/32https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/826/32http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/826/32https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/826/32https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/826/32http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/826/32GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/826/32/table1 (Catalog of candidate star clusters in NGC 3256)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/826/32/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/826/32/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/826/32/table1?GETtext/xml+votable180.050000true156.96813333-43.909250.0055555555555555566/381392.0401237512456292e-19 6.365665036194905e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/826/32?format=asciiOpticaldefaultJ/ApJ/826/32/table1Catalog of candidate star clusters in NGC 3256recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning index numbermeta.id;meta.mainintRAJ2000[10] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[43] Degree of Declination (J2000)pos.eq.dec;meta.mainUmag[15.9/26.3] Apparent U band magnitude (HST/ACS F330W)magphot.mag;em.opt.Ufloate_Umag[0/2.9] The 1{sigma} uncertainty in Umagmagstat.error;phot.mag;em.opt.UfloatBmag[17/24] Apparent B band magnitude (HST/WFC F435W)magphot.mag;em.opt.Bfloate_Bmag[0/0.4] The 1{sigma} uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatVmag[17.4/23] Apparent V band magnitude (HST/ACS F555W)magphot.mag;em.opt.Vfloate_Vmag[0/0.4] The 1{sigma} uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatHamag[18/29] Apparent H{alpha} band magnitude (HST/ACS FR656N)magphot.flux;em.line.Halphafloate_Hamag[0/24.1] The 1{sigma} uncertainty in Hamagmagstat.error;phot.mag;em.IR.HfloatImag[15.8/23.2] Apparent I band magnitude (HST/WFC F814W)magphot.mag;em.opt.Ifloate_Imag[0/0.8] The 1{sigma} uncertainty in Imagmagstat.error;phot.mag;em.opt.IfloatlogM[3.9/7.3] Log cluster mass (1)log(solMass)phys.massfloatlogtau[6.4/10] Log cluster age (1)log(yr)time.agefloatE(B-V)[0/1.2] The (B-V) color excess (1)magphot.color.excessfloat