J/A+A/702/A264ivo://CDS.VizieR/J/A+A/702/A264doi:10.26093/cds/vizier/bc-ny/lcgeCDSPaspaliaris E.D.Bianchi S.Corbelli E.Concas A.2026-08-03T06:58:15Z2025-10-28T15:11:45ZCDS support team

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

cds-question@unistra.frgalaxiesextinctionvisible-astronomyThe purpose of the present study is to relate the optical attenuation inferred by the Balmer decrement, AVBD, and by the spectral energy distribution (SED)-fitting, AVSED, to the dust distribution and gas surface density throughout the disc of galaxies, down to scales smaller than 0.5kpc We investigate five nearby Herschel-detected star-forming spiral galaxies with available far-ultraviolet to sub-millimetre observations, along with atomic and molecular gas surface density maps and optical integral-field spectroscopic data. We use the CIGALE SED-fitting code to map the dust mass surface density SigmaDUST and AVSED of different stellar populations. For each pixel, we independently estimate the attenuation from the Balmer decrement. We find that both SigmaDUST and AVBD trace better the molecular and total gas mass surface density, rather than the atomic gas. Since regions sampled in this study have high molecular fractions, atomic gas surface densities, indicative of molecular gas shielding layers, decrease as the mean dust-to-gas ratio increases from galaxy to galaxy. The fitted attenuation towards the young stellar population, AVSEDyoung, is in good agreement with AVBD and it can then be used to trace the attenuation in star-forming galaxies where integral-field observations are not available. We estimate the ratio of AVBD over the total stellar AVSED and find it slightly larger than what has been found in previous studies. Finally, we investigate which dust distribution reproduces better the estimated AVBD and AVSED. We find that the attenuation towards old stars is consistent with the expectations for a standard galactic disc, where the stellar and dust distributions are mixed, while AVBD and the AVSEDyoung are between the values expected for a foreground dust screen and the mixed configuration.2025A&A...702A.264Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/702/A264CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/702/A264https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/702/A264http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/702/A264https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/702/A264https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/702/A264http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/702/A264GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/702/A264/table1 (Integrated properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/702/A264/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/702/A264/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/702/A264/table1?GETtext/xml+votable180.050000true24.173937515.783641670.0055555555555555566/18398 27514 27861 28035 28167https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/702/A264?format=asciiOpticaldefaultJ/A+A/702/A264/table1Integrated propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdGalaxy identifiermeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTypeHubble Type (1)meta.notecharD25Major axis of the optical 25mag/arcsec^2^ isophote (1)arcminphys.angSizefloatDDistance (Anand et al., 2021MNRAS.501.3621A)Mpcpos.distancefloatpwPixel width in physical scalekpcphys.angSize;instr.pixelfloatiInclinationdegsrc.orbital.inclinationfloatPAPosition angle (Walter et al., 2008AJ....136.2563W, Cat. J/AJ/136/2563; Chung et al. 2009AJ....138.1741C)degpos.posAngintMHIHI mass1e+09solMassphys.massfloatMH2H_2_ mass1e+09solMassphys.massfloatSFRStar formation ratesolMass/yrphys.SFRfloate_SFRStar formation rate errorsolMass/yrstat.error;phys.SFRfloatMstarStellar mass1e+09solMassphys.massfloate_MstarStellar mass error1e+09solMassstat.errorfloatMdustDust mass1e+09solMassphys.massfloate_MdustDust mass error1e+09solMassstat.errorfloatJ/A+A/702/A264/tablea1*Derived physical properties per pixelSigmaDUST?=-999.999 dust mass surface densitysolMass.pc**-2phys.densitydoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintpixidUnique ID of each pixel with fractional part indicating NGC galaxy IDmeta.id;meta.maindoublepxx-axis pixel serial number (1)pos.cartesian.x;instr.detintpyy-axis pixel serial number (1)pos.cartesian.y;instr.detinte_SigmaDUST? Error on dust mass surface densitysolMass.pc**-2stat.errordoublenullableAVBD? V-band attenuation inferred by BDmagphys.absorptiondoublenullablee_AVBD? Error on V-band attenuation inferred by BDmagstat.errordoublenullableAVSED? V-band attenuation inferred by SEDmagphys.absorptiondoublenullablee_AVSED? Error on V-band attenuation inferred by SEDmagstat.errordoublenullableAVSEDold? V-band attenuation towards old stars inferred by SEDmagphys.absorptiondoublenullablee_AVSEDold? Error on V-band attenuation towards old stars inferred by SEDmagstat.errordoublenullableAVSEDyoung? V-band attenuation towards young stars inferred by SEDmagphys.absorptiondoublenullablee_AVSEDyoung? Error on V-band attenuation towards young stars inferred by SEDmagstat.errordoublenullable