J/ApJ/757/52ivo://CDS.VizieR/J/ApJ/757/52doi:10.26093/cds/vizier.17570052CDSMao Y.-W.Kennicutt R.C. JrHao C.-N.Kong X.Zhou X.2017-07-11T13:08:39Z2014-07-02T10:23:08ZCDS support team

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

cds-question@unistra.frgalaxiesultraviolet-photometryinfrared-photometryThe correlation between infrared-to-ultraviolet luminosity ratio and ultraviolet color (or ultraviolet spectral slope), i.e., the IRX-UV (or IRX-{beta}) relation, found in studies of starburst galaxies is a prevalent recipe for correcting extragalactic dust attenuation. Considerable dispersion in this relation discovered for normal galaxies, however, complicates its usability. In order to investigate the cause of the dispersion and to have a better understanding of the nature of the IRX-UV relation, in this paper, we select five nearby spiral galaxies, and perform spatially resolved studies on each of the galaxies, with a combination of ultraviolet and infrared imaging data. We measure all positions within each galaxy and divide the extracted regions into young and evolved stellar populations. By means of this approach, we attempt to discover separate effects of dust attenuation and stellar population age on the IRX-UV relation for individual galaxies. In this work, in addition to dust attenuation, stellar population age is interpreted to be another parameter in the IRX-UV function, and the diversity of star formation histories is suggested to disperse the age effects. At the same time, strong evidence shows the need for more parameters in the interpretation of observational data, such as variations in attenuation/extinction law. Fractional contributions of different components to the integrated luminosities of the galaxies suggest that the integrated measurements of these galaxies, which comprise different populations, would weaken the effect of the age parameter on IRX-UV diagrams. The dependence of the IRX-UV relation on luminosity and radial distance in galaxies presents weak trends, which offers an implication of selective effects. The two-dimensional maps of the UV color and the infrared-to-ultraviolet ratio are displayed and show a disparity in the spatial distributions between the two galaxy parameters, which offers a spatial interpretation of the scatter in the IRX-UV relation.2012ApJ...757...52Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/757/52CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)J/ApJ/741/79 : The Spitzer-SDSS-GALEX Spectroscopic Survey (O'Dowd+, 2011)J/AJ/141/205 : UVOT imaging of M81 and Holmberg IX (Hoversten+, 2011)J/ApJS/190/233 : Spectro. and abundances of SINGS galaxies (Moustakas+, 2010)J/ApJ/715/572 : GOALS UV and FIR properties (Howell+, 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/703/1569 : Radial distribution in SINGS gal. I. (Munoz-Mateos+, 2009)J/ApJ/703/517 : The Spitzer Local Volume Legacy: IR photometry (Dale+, 2009)J/ApJ/701/1965 : Radial dust properties of SINGS galaxies (Munoz-Mateos+, 2009)J/ApJS/173/572 : GALEX/Spitzer photometry in NGC 7331 (Thilker+, 2007)J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)J/ApJ/671/333 : Aperture photometry in NGC 5194 (Kennicutt+, 2007)J/ApJ/648/987 : UV through far-IR analysis of M81 (Perez-Gonzalez+, 2006)J/ApJ/633/871 : Positions and photometry of HII knots in M51 (Calzetti+, 2005)http://galex.stsci.edu/GR6/ : GALEX data accesshttp://ssc.spitzer.caltech.edu/ : Spitzer Science Center home pagehttp://irsa.ipac.caltech.edu/data/SPITZER/SINGS/ : SINGS Spitzer data accesshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/757/52https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/757/52http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/757/52https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/757/52https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/757/52http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/757/52GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/757/52/photo (Combined table from original tables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/757/52/photo?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/757/52/photo?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/757/52/photo?GETtext/xml+votable180.050000true148.74769.2360.0055555555555555566/7606 11026 11027 13522 15592 15593 26271https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/757/52?format=asciiUVInfrareddefaultJ/ApJ/757/52/photoCombined table from original tablesIDSource identifier (1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000) (2)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000) (2)degpos.eq.dec;meta.mainLFUVGALEX/FUV (1516{AA}) luminosity (3)1e-07Wphys.luminosity;em.UVdoublee_LFUVUncertainty in LFUV1e-07Wstat.errordoubleLNUVGALEX/NUV (2267{AA}) luminosity (3)1e-07Wphys.luminosity;em.UVdoublee_LNUVUncertainty in LNUV1e-07Wstat.errordoubleL8Spitzer/IRAC 8um luminosity (4)1e-07Wphys.luminosity;em.IR.8-15umdoublee_L8Uncertainty in L81e-07Wstat.errordoubleL24Spitzer/MIPS 24um luminosity (4)1e-07Wphys.luminosity;em.IR.15-30umdoublee_L24Uncertainty in L241e-07Wstat.errordouble