J/A+A/594/A34ivo://CDS.VizieR/J/A+A/594/A34doi:10.26093/cds/vizier.35940034CDSRodriguez M.J.Baume G.Feinstein C.2016-10-06T07:28:03Z2016-10-06T08:27:38ZCDS support team

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

cds-question@unistra.frstellar-associationsopen-star-clustersearly-type-starsThe purpose of this work is to understand the global characteristics of the stellar populations in NGC 300. In particular, we focused our attention on searching young star groups and study their hierarchical organization. The proximity and orientation of this Sculptor Group galaxy make it an ideal candidate for this study. The research was conducted using archival point spread function (PSF) fitting photometry measured from images in multiple bands obtained with the Advanced Camera for Surveys of the Hubble Space Telescope (ACS/HST). Using the path linkage criterion (PLC), we cataloged young star groups and analyzed them from the observation of individual stars in the galaxy NGC 300. We also built stellar density maps from the bluest stars and applied the SExtractor code to identify overdensities. This method provided an additional tool for the detection of young stellar structures. By plotting isocontours over the density maps and comparing the two methods, we could infer and delineate the hierarchical structure of the blue population in the galaxy. For each region of a detected young star group, we estimated the size and derived the radial surface density profiles for stellar populations of different color (blue and red). A statistical decontamination of field stars was performed for each region. In this way it was possible to build the color-magnitude diagrams (CMD) and compare them with theoretical evolutionary models. We also constrained the present-day mass function (PDMF) per group by estimating a value for its slope. The blue population distribution in NGC 300 clearly follows the spiral arms of the galaxy, showing a hierarchical behavior in which the larger and loosely distributed structures split into more compact and denser ones over several density levels. We created a catalog of 1147 young star groups in six fields of the galaxy NGC 300, in which we present their fundamental characteristics. The mean and the mode radius values obtained from the size distribution are both 25pc, in agreement with the value for the Local Group and nearby galaxies. Additionally, we found an average PDMF slope that is compatible with the Salpeter value.2016A&A...594A..34Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/594/A34CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/594/A34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/594/A34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/594/A34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/594/A34https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/594/A34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/594/A34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/594/A34/table2 (Characteristics of 1147 young star groups)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/594/A34/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/594/A34/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/594/A34/table2?GETtext/xml+votable180.050000true13.89084111-37.688836110.0055555555555555566/35536 35538https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/594/A34?format=asciidefaultJ/A+A/594/A34/table2Characteristics of 1147 young star groupsField[1/6] ACS/WFC fieldmeta.id;obs.fieldintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentification number of the star group (FNNN, where F is the ACS/WFC field number)meta.numberintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainRadRadiusarcsecphys.angSize;srcfloatNNumber of stars in the group's regionmeta.numberintNbriNumber of stars with F555W<25meta.numberintNdctNumber of stars after the decontamination processmeta.numberintNdct-briNumber of decontaminated stars with F555W<25meta.numberintNblueNumber of blue starsmeta.numberintNblue-dctNumber of blue stars with F555W<25meta.numberintNredNumber of red starsmeta.numberintNred-dctNumber of red stars with F555W<25meta.numberintMagminMagnitude of the brightest star in F555W bandmagphot.mag;em.opt.VfloatPDMFslope? Present day mass function slopearith.grad;phys.massfloatnullablee_PDMFslope? PDMF slope errorstat.errorfloatnullabledgcGalactocentric distancekpcpos.distance;pos.galactocentricfloat