J/A+A/459/85ivo://CDS.VizieR/J/A+A/459/85doi:10.26093/cds/vizier.34590085CDSNagao T.Maiolino R.Marconi A.2017-10-09T13:34:07Z2007-07-15T22:26:26ZCDS support team

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

cds-question@unistra.frinterstellar-mediumchemical-abundancesGenerally the gas metallicity in distant galaxies can only be inferred by using a few prominent emission lines. Various theoretical models have been used to predict the relationship between emission line fluxes and metallicity, suggesting that some line ratios can be used as diagnostics of the gas metallicity in galaxies. However, accurate empirical calibrations of these emission line flux ratios from real galaxy spectra spanning a wide metallicity range are still lacking. In this paper we provide such empirical calibrations by using the combination of two sets of spectroscopic data: one consisting of low-metallicity galaxies with a measurement of [O III]{lambda}4363 taken from the literature, including spectra from the Sloan Digital Sky Survey (SDSS), and the other one consisting of galaxies in the SDSS database whose gas metallicity has been determined from various strong emission lines in their spectra. This combined data set constitutes the largest sample of galaxies with information on the gas metallicity available so far and spanning the widest metallicity range. By using these data we obtain accurate empirical relations between gas metallicity and several emission line diagnostics, including the R23 parameter, the [NII]{lambda}6584/H{alpha} and [O III]{lambda}5007/[NII]{lambda}6584 ratios.2006A&A...459...85Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/459/85CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/459/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/459/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/459/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/459/85https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/459/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/459/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/459/85/table1 (Re-calculated properties of the compiled low-metallicity galaxies)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/459/85/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/459/85/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/459/85/table1?GETtext/xml+votable180.050000true8.012958318.07947220.0055555555555555566/38 2109 2258 3042 4948 5203 5366 5419 5556 5607 5764 6005 6010-6011 6046 6075 6087 6361 6619 6995 7208 7243 7251-7252 7261 7263 7273 7281 7381 7683 7692 7799 7878 7926 7946 8028 8908 9046 9060 9112 9125 9362 9954 10301 10328 10344 10348 10388 10472 10475 10561 10587 10607 10689 10769 10847 10888 10927 10970 11031 11132 11137 11177-11178 11180 11239 11355 11382 11428 11782 17771 17867 18002 18011 18041 18099 18198 18235 19112 19417 19702 19828 19858 20388 22828 22890 23078 23566 24696 25344 25594 26362 26971 26992 27079 27199 27243 27457 27677 27713 27729 27765 27773 27775 27884 27945 28077 28159 28335 28495 28500 28505 28514 28584 28631 36756 38846 43754 43797 46597https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/459/85?format=asciiOpticaldefaultJ/A+A/459/85/table1Re-calculated properties of the compiled low-metallicity galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharR23R23 parameter (1)phot.flux;arith.ratiofloate_R23rms uncertainty on R23stat.errorfloatl_nH(s+)Limit flag on nH(s+)meta.code.errorcharnH(s+)Gas density of the S+ regionscm**-3phys.columnDensityintE_nH(s+)? Error on nH(s+) (upper limit)cm**-3stat.error;stat.maxintnullablee_nH(s+)? Error on nH(s+) (lower limit)cm**-3stat.errorintnullablen_nH(s+)[d] d: Adopted flux (2)meta.notechart(O2+)Gas temperature of the O2+ regions10000Kphys.temperaturefloatE_t(O2+)Error on t(O2+) (upper limit)10000Kstat.error;stat.maxfloate_t(O2+)Error on t(O2+) (lower limit)10000Kstat.errorfloat12+log(O/H)(O/H) abundancephys.abundfloate_12+log(O/H)rms uncertainty on 12+log(O/H)stat.errorfloatRefReference, in refs.dat filemeta.ref;pos.frame;meta.filecharSimbadNameSimbad column added by the CDSmeta.idchar_RAExplain (right ascension part)degpos.eq.ra;meta.main_DEExplain (declination part)degpos.eq.dec;meta.mainJ/A+A/459/85/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.note;meta.maincharprimaryBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar