J/MNRAS/494/4751ivo://CDS.VizieR/J/MNRAS/494/4751doi:10.26093/cds/vizier.74944751CDSMolina M.Ajgaonkar N.Yan R.Ciardullo R.Gronwall C.Eracleous M.,Boquien M.Schneider D.P.2024-08-21T20:14:17Z2023-07-31T08:26:56ZCDS support team

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

cds-question@unistra.frgalaxiesstar-forming-regionsredshiftedastrometryultraviolet-photometryvisible-astronomyspectroscopyThe attenuation of light from star-forming galaxies is correlated with a multitude of physical parameters including star formation rate, metallicity and total dust content. This variation in attenuation is even more evident on kiloparsec scales, which is the relevant size for many current spectroscopic integral field unit surveys. To understand the cause of this variation, we present and analyse Swift/UVOT near-UV (NUV) images and SDSS/MaNGA emission-line maps of 29 nearby (z<0.084) star-forming galaxies. We resolve kiloparsec-sized star-forming regions within the galaxies and compare their optical nebular attenuation (i.e. the Balmer emission line optical depth, {tau}^l^_B_~{tau}_H{beta}_-{tau}_H{alpha}_) and NUV stellar continuum attenuation (via the NUV power-law index, {beta}) to the attenuation law described by Battisti et al. We show the data agree with that model, albeit with significant scatter. We explore the dependence of the scatter of the {beta}-{tau}^l^_B_ measurements from the star-forming regions on different physical parameters, including distance from the nucleus, star formation rate and total dust content. Finally, we compare the measured {tau}^l^_B_ and {beta} values for the individual star-forming regions with those of the integrated galaxy light. We find a strong variation in {beta} between the kiloparsec scale and the larger galaxy scale that is not seen in {tau}^l^_B_. We conclude that the sightline dependence of UV attenuation and the reddening of {beta} due to the light from older stellar populations could contribute to the scatter in the {beta}-{tau}^l^_B_ relation.2020MNRAS.494.4751Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/494/4751CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)IX/43 : 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014)II/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/494/4751https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/494/4751http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/494/4751https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/494/4751https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/494/4751http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/494/4751GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/494/4751/table2 (Basic properties of star-forming galaxies and UVOT images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/494/4751/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/494/4751/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/494/4751/table2?GETtext/xml+votable180.050000true318.026426111.34515690.005555555555555556Cone search capability for table J/MNRAS/494/4751/tablea1 (Aperture Definitions for Star Forming Regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/494/4751/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/494/4751/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/494/4751/tablea1?GETtext/xml+votable180.050000true318.0266611.347230.0055555555555555566/4960 5555 5558 5629 5757 5982 6260 6560 6625 6636 6638 6928 9468 9470 9480 10312 10691 11312 11416 12399 17741 17749 22716 23208 28370https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/494/4751?format=asciiUVOpticaldefaultJ/MNRAS/494/4751/table2Basic properties of star-forming galaxies and UVOT imagesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/29] Internal object identifiermeta.idintNameGalaxy namemeta.id;meta.maincharf_Name[*] Flag on Name (1)meta.codecharClassSDSS galaxy classification (2)meta.code.classcharzRedshift (3)src.redshiftfloatE(B-V)Extinction from Schlegel et al. (1998ApJ...500..525S)magphot.color.excessfloatb/aAxial ratio (3)phys.angSize;arith.ratiofloatRpetPetrosian radius calculated using the uvw2 filterarcsecphys.angSize;srcintlogMassLogarithm of the stellar mass (4)log(solMass)phys.massfloatlogSFRLogarithm of the star formation rate (5)log(solMass.yr**-1)phys.SFRfloattuvw2Exposure time on the uvw2 filterstime.duration;obs.exposureinttuvw1Exposure time on the uvw1 filterstime.duration;obs.exposureintfuvw2Minimum flux density detection in the uvw2 filter (6)1e-18W.m**-2.nm**-1phot.flux;em.UVfloatfuvw1Minimum flux density detection in the uvw1 filter (6)1e-18W.m**-2.nm**-1phot.flux;em.UVfloatSuvw2Surface density in the uvw2 filter (7)1e-18W.m**-2.nm**-1.arcsec**-2phot.flux;em.UVfloate_Suvw2Error on Suvw21e-18W.m**-2.nm**-1.arcsec**-2stat.errorfloatSuvw1Surface density in the uvw1 filter (7)1e-18W.m**-2.nm**-1.arcsec**-2phot.flux;em.UVfloate_Suvw1Error on Suvw11e-18W.m**-2.nm**-1.arcsec**-2stat.errorfloatuvw2mag? Swift uvw2 AB magnitude without K-correctionsmagphot.mag;em.UVfloatnullablee_uvw2mag? Error on uvw2magmagstat.error;phot.magfloatnullableuvw1mag? Swift uvw1 AB magnitude without K-correctionsmagphot.mag;em.UVfloatnullablee_uvw1mag? Error on uvw1magmagstat.error;phot.magfloatnullabletaulB? Balmer emission line optical depth {tau}^l^_B_ (8)phys.absorption.opticalDepthfloatnullablee_taulB? Error on taulB (9)stat.errorfloatnullablebeta? NUV power-law index (8)spect.indexfloatnullablee_beta? Error on beta (10)stat.errorfloatnullable_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.mainJ/MNRAS/494/4751/table3Flux measurements of star-forming regionse_FN2Error on FN2 (2)1e-17mW.m**-2stat.errorintFN2Flux on the [NII]{lambda}6583 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/29] Internal object identifiermeta.id.parentintRegionRegion identifiermeta.id;meta.mainfloatFuvw2Flux density for the Swift uvw2 filter (1)1e-19W.m**-2.nm**-1phot.flux;em.UVfloate_Fuvw2Error on Fuvw21e-19W.m**-2.nm**-1stat.errorfloatFuvw1Flux density for the Swift uvw1 filter (1)1e-19W.m**-2.nm**-1phot.flux;em.UVfloate_Fuvw1Error on Fuvw11e-19W.m**-2.nm**-1stat.errorfloatFHbFlux on the H{beta} {lambda}4861 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineinte_FHbError on FHb (2)1e-17mW.m**-2stat.errorintFO3Flux on the [OIII]{lambda}5007 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineinte_FO3Error on FO3 (2)1e-17mW.m**-2stat.errorintFO1Flux on the [OI]{lambda}6300 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineinte_FO1Error on FO1 (2)1e-17mW.m**-2stat.errorintFHaFlux on the H{alpha} {lambda}6563 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineinte_FHaError on FHa (2)1e-17mW.m**-2stat.errorintFS26716Flux on the [SII]{lambda}6716 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineinte_FS26716Error on FS26716 (2)1e-17mW.m**-2stat.errorintFS26731Flux on the [SII]{lambda}6731 line corrected for foreground extinction1e-17mW.m**-2phot.flux;spect.lineinte_FS26731Error on FS26731 (2)1e-17mW.m**-2stat.errorintJ/MNRAS/494/4751/table4Derived quantities of star-forming regionsAreaAreakpc**2phys.angSizefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionRegion identifiermeta.id;meta.mainfloatDistDifference between the nuclear coordinate of the galaxy and the centre of the region's aperturekpcpos.distance;arith.difffloatlogSHaLogarithm of the H{alpha} surface brightnesslog(1e-07W.kpc**-2)phot.mag.sb;em.line.Halphafloate_logSHaError on logSHalog(1e-07W.kpc**-2)stat.errorfloatbetaNUV power-law index {beta}spect.indexfloate_betaError on betastat.errorfloattaulBBalmer emission line optical depth {tau}^l^_B_phys.absorption.opticalDepthfloate_taulBError on taulB (1)stat.errorfloatlog[O/H]Oxygen abundance (2)phys.abundfloate_log[O/H]Error on 12+log[O/H] (3)stat.errorfloatDn(4000)D_n_(4000) spectroscopic indexspect.indexfloate_Dn(4000)Error on Dn(4000) (4)stat.errorfloatEW(Ha)H{alpha} equivalent width0.1nmspect.line.eqWidthfloate_EW(Ha)Error on EW(Ha) (1)0.1nmstat.errorfloatJ/MNRAS/494/4751/tablea1Aperture Definitions for Star Forming RegionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionRegion identifiermeta.id;meta.mainfloatRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainaAperture sizearcsecphys.angSizedoubleb/aAxial ratiophys.angSize;arith.ratiodoubletheta? Aperture position angledegpos.posAng;instr.fovintnullable