J/ApJ/744/44ivo://CDS.VizieR/J/ApJ/744/44doi:10.26093/cds/vizier.17440044CDSWeisz D.R.Johnson B.D.Johnson L.C.Skillman E.D.Lee J.C.,Kennicutt R.C.Calzetti D.van Zee L.Bothwell M.S.Dalcanton J.J.,Dale D.A.Williams B.F.2017-11-06T12:23:40Z2013-07-23T12:06:43ZCDS support team

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

cds-question@unistra.frgalaxiesultraviolet-astronomysurface-photometryabsolute-magnitudevisible-astronomyh-alpha-photometryWe consider the effects of non-constant star formation histories (SFHs) on H{alpha} and GALEX far-ultraviolet (FUV) star formation rate (SFR) indicators. Under the assumption of a fully populated Chabrier initial mass function (IMF), we compare the distribution of H{alpha}-to-FUV flux ratios from ~1500 simple, periodic model SFHs with observations of 185 galaxies from the Spitzer Local Volume Legacy survey. We find a set of SFH models that are well matched to the data, such that more massive galaxies are best characterized by nearly constant SFHs, while low-mass systems experience burst amplitudes of ~30 (i.e., an increase in the SFR by a factor of 30 over the SFR during the inter-burst period), burst durations of tens of Myr, and periods of ~250 Myr; these SFHs are broadly consistent with the increased stochastic star formation expected in systems with lower SFRs. We analyze the predicted temporal evolution of galaxy stellar mass, R-band surface brightness, H{alpha}-derived SFR, and blue luminosity, and find that they provide a reasonable match to observed flux distributions. We find that our model SFHs are generally able to reproduce both the observed systematic decline and increased scatter in H{alpha}-to-FUV ratios toward low-mass systems, without invoking other physical mechanisms.2012ApJ...744...44Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/744/44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)J/ApJ/733/74 : GALEX-SDSS properties of local galaxies (Lemonias+, 2011)J/ApJ/734/L22 : ACS Nearby Galaxy Survey Treasury (Williams+, 2011)J/ApJ/714/1256 : Far-IR star formation rate indicators (Calzetti+, 2010)J/ApJ/706/599 : H{alpha} and UV SFR in the local volume (Lee+, 2009)J/ApJ/706/553 : Fluxes in nearby star-forming galaxies (Boquien+, 2009)J/ApJ/703/1672 : Far-IR and H{alpha} fluxes in galaxies (Kennicutt+, 2009)J/ApJ/703/517 : The Spitzer Local Volume Legacy: IR photometry (Dale+, 2009)J/ApJ/693/1821 : The Spitzer infrared nearby galaxies survey (Dale+, 2009)J/ApJS/178/247 : H{alpha} and [NII] survey in local 11 Mpc (Kennicutt+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/744/44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/744/44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/744/44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/744/44https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/744/44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/744/44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/744/44/table1 (Basic properties of the Local Volume Legacy galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/744/44/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/744/44/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/744/44/table1?GETtext/xml+votable180.050000true189.666916732.76680560.0055555555555555566/396 764 2121 2130 4181 4511 5061 5067 5116 5132 5142 5174 5202 5203 5230 5283 5287 5329 5504 5584 5607 5636 5978 6502 6604 6605 6623 6649 7599 7602 7604 7606 7607 7624 7649 7743 7769 7799 7878 7946 7956 8120 8908 10265 10538 10561 10607 10627 10659 10755 10761 10762 10767 10793 10798 10799 10800 10809 10818 10840 10841 10847 10856 10881 10888 10896 10897 10900 10901 10905 10908 10910 10911 10935 10941 10954 10959 10970 10976 10986 10998 10999 11019 11027 11030 11045 11084 11127 11140 11143 11227 11434 11444 11448 11639 11681 11933 12047 12199 16441 16519 16544 16605 16655 16701 17165 18032 18041 18398 18419 18429 19779 19990 21026 21027 24912 24952 25083 26814 26858 26977 27030 27055 27351 27375 27383 27465 27512 27514 27591 27643 27926 28015 28087 28091 28149 28167 28172 28173 28451 28468 28510 28535 28608 28610 28631 28636 28637 28666 33151 33193 33571 33655 33656 33685 33966 34297 34401 34403 34404 34641 35214 35243 36164 43874 43878 43925 43972 45777 45914 46339 46545 46597https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/744/44?format=asciiUVOpticaldefaultJ/ApJ/744/44/table1Basic properties of the Local Volume Legacy galaxiesSimbadNameSimbad column added by the CDSmeta.idcharNameGalaxy namemeta.id;meta.maincharr_NameOptical observation source code reference (3)meta.ref;pos.frameintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogM*Log of galaxy stellar masslog(solMass)phys.massfloatlogSigRLog of R-band surface brightnesslog(solLum.kpc**-2)phys.luminosityfloatBMagAbsolute B-band magnitudemagphot.mag;em.opt.BfloatlogSFRLog of H{alpha} star formation rate (1)log(solMass.yr**-1)phys.SFR;spect.linefloatlogR+kLog of H{alpha}/FUV fluxes plus {kappa} (2)phot.flux;arith.ratiofloatSCatCross-match within 10" with the catalog sources for the sample (Cat. J/ApJS/178/247,Cat. J/ApJS/192/6, Cat. J/ApJ/703/517 and SDSS-DR7meta.ref.urlintnullableNEDSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main