J/MNRAS/432/2112ivo://CDS.VizieR/J/MNRAS/432/2112doi:10.26093/cds/vizier.74322112CDSBrinchmann J.Charlot S.Kauffmann G.Heckman T.White S.D.M.,Tremonti C.2024-07-21T20:15:04Z2014-07-31T13:06:26ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyline-intensitiesWe present a method to estimate the total gas column density, dust-to-gas and dust-to-metal ratios of distant galaxies from rest-frame optical spectra. The technique exploits the sensitivity of certain optical lines to changes in depletion of metals on to dust grains and uses photoionization models to constrain these physical ratios along with the metallicity and dust column density. We compare our gas column density estimates with HI and CO gas mass estimates in nearby galaxies to show that we recover their total gas mass surface density to within a factor of 2 up to a total surface gas mass density of ~75M{sun}/pc^2^. Our technique is independent of the conversion factor of CO to H_2_ and we show that a metallicity-dependent X_CO_ is required to achieve good agreement between our measurements and that provided by CO and HI. However, we also show that our method cannot be reliably aperture corrected to total integrated gas mass. We calculate dust-to-gas ratios for all star-forming galaxies in the Sloan Digital Sky Survey Data Release 7 and show that the resulting dependence on metallicity agrees well with the trend inferred from modelling of the dust emission of nearby galaxies using far-IR data. We also present estimates of the variation of the dust-to-metal ratio with metallicity and show that this is poorly constrained at metallicities below 50% solar. We conclude with a study of the inventory of gas in the central regions, defined both in terms of a fixed physical radius and as a fixed fraction of the half-light radius, of ~70000 star-forming galaxies from the Sloan Digital Sky Survey. We show that their central gas content and gas depletion time are not accurately predicted by a single parameter, but in agreement with recent studies we find that a combination of the stellar mass and some measure of central concentration provides a good predictor of gas content in galaxies. We also identify a population of galaxies with low surface densities of stars and very long gas depletion times.2013MNRAS.432.2112Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/432/2112CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org : SDSS Home Pagehttp//www.mpa-garching.mpg.de/SDSS :https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/432/2112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/432/2112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/432/2112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/432/2112https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/432/2112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/432/2112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/432/2112/regions (Overview and measurements for regions with HI and CO interferometric data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/432/2112/regions?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/432/2112/regions?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/432/2112/regions?GETtext/xml+votable180.050000true114.213458365.68379170.0055555555555555566/4511 5715 5751 7602 7606 7743 10911 11434 18398 27514 28167 28631https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/432/2112?format=asciiOpticaldefaultJ/MNRAS/432/2112/regionsOverview and measurements for regions with HI and CO interferometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegRegion name (NGCnnnn-nn) (G1)meta.id;meta.maincharPlate? SDSS Plate identificationmeta.id;instr.plateintnullableMJD? SDSS MJD observation datedtime.epochintnullableFib? SDSS Fiber identificationmeta.idintnullableRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainIDR7[311385/920120]? Zero-offset index of this object in the MPA-JHU value-added catalogues Brinchmann et al. (2004MNRAS.351.1151B) found at http//www.mpa-garching.mpg.de/SDSSmeta.idintnullableDR7Details from SDSS-DR9 photometric catalogmeta.ref.urlcharSloanDisplay the SDSS data for this spectrummeta.ref.urlcharlogSHIHI surface mass density (from HI)log(solMass.pc**-2)phot.flux.density.sb;em.line.HIfloatlogSmolMolecular surface mass density (from CO)log(solMass.pc**-2)phot.flux.density.sbfloatb_logSgGas surface mass density at 16% of confidence intervallog(solMass.pc**-2)phot.flux.density.sbfloatlogSgMedian gas surface mass densitylog(solMass.pc**-2)phot.flux.density.sb;stat.medianfloatB_logSgGas surface mass density at 84% of confidence intervallog(solMass.pc**-2)phot.flux.density.sbfloatEWHa? H{alpha} equivalent width ({AA})0.1nmspect.line.eqWidth;em.line.HalphafloatnullableEWHb? H{beta} equivalent width ({AA})0.1nmspect.line.eqWidth;em.line.HbetafloatnullableHa/Hb? H{alpha}/H{beta} Balmer decrementphot.flux;arith.ratiofloatnullablen_Ha/Hb[I] I for {infinity}meta.notecharg-rg-r colour indexmagphot.color;em.opt.B;em.opt.Rfloatu-ru-r colour indexmagphot.colorfloat