J/ApJ/734/L22ivo://CDS.VizieR/J/ApJ/734/L22doi:10.26093/cds/vizier.17349022CDSWilliams B.F.Dalcanton J.J.Johnson L.C.Weisz D.R.Seth A.C.,Dolphin A.Gilbert K.M.Skillman E.Rosema K.Gogarten S.M.,Holtzman J.de Jong R.S.2017-09-22T16:15:50Z2013-01-15T15:37:59ZCDS support team

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

cds-question@unistra.frgalaxieshst-photometryWe present a measurement of the age distribution of stars residing in spiral disks and dwarf galaxies. We derive a complete star formation history of the ~140Mpc^3^ covered by the volume-limited sample of galaxies in the Advanced Camera for Surveys (ACS) Nearby Galaxy Survey Treasury (ANGST). The total star formation rate density history ({rho}_SFR_(t)) is dominated by the large spirals in the volume, although the sample consists mainly of dwarf galaxies. Our {rho}_SFR_(t) shows a factor of ~3 drop at z~2, in approximate agreement with results from other measurement techniques. While our results show that the overall {rho}_SFR_(t) has decreased since z~1, the measured rates during this epoch are higher than those obtained from other measurement techniques. This enhanced recent star formation rate appears to be largely due to an increase in the fraction of star formation contained in low-mass disks at recent times. Finally, our results indicate that despite the differences at recent times, the epoch of formation of ~50% of the stellar mass in dwarf galaxies was similar to that of ~50% of the stellar mass in large spiral galaxies (z>~2), despite the observed galaxy-to-galaxy diversity among the dwarfs.2011ApJ...734L..22Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/734/L22CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/AJ/127/2031 : Catalog of neighboring galaxies (Karachentsev+, 2004)J/AJ/127/2002 : Star Formation Rate of NFGS galaxies (Kewley+, 2004)http://www.nearbygalaxies.org/ : ANGST home pagehttp://archive.stsci.edu/prepds/angst/ : ANGST archivehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/734/L22https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/734/L22http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/734/L22https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/734/L22https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/734/L22http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/734/L22GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/734/L22/table1 (Data used for star formation history determination)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/734/L22/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/734/L22/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/734/L22/table1?GETtext/xml+votable180.050000true151.01625-27.3336110.0055555555555555566/2282 5584 7577 7582 7600 7602 7603 7604 7606 7618 7624 7649 7650 7743 7769 7786 7799 7878 7946 7956 7970 8120 8908 10153 10532 10538 10607 10627 10659 10762 10910 10999 11120 13637 16459 16544 16655 16695 16701 16744 16833 26047 26858 27351 27926 28631 28636 28637 28666 35482 35514 35536 38841 38846 43706 46597https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/734/L22?format=asciiOpticaldefaultJ/ApJ/734/L22/table1Data used for star formation history determinationSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy namemeta.id;meta.maincharPID[5898/11986] Proposal ID. number of data usedmeta.numberintTargetTarget name of dataset usedmeta.id;instr.setupcharCamCamera of dataset used; WFPC2 or ACSmeta.id;instrcharFiltBroadband Filter (F435W, F475W, F555W, F606W or F814W)meta.notechartExpTotal exposure time of data usedstime.duration;obs.exposureintNstars[325/442068] Number of stars in the photometry catalogmeta.numberintm50[24.46/29.69] Apparent magnitude of the 50% completeness limitmagphot.magfloatM50Absolute magnitude of the 50% completeness limitmagphys.magAbsfloatNEDSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main