J/ApJ/755/40ivo://CDS.VizieR/J/ApJ/755/40doi:10.26093/cds/vizier.17550040CDSPellegrini E.W.Oey M.S.Winkler P.F.Points S.D.Smith R.C.,Jaskot A.E.Zastrow J.2017-10-13T15:41:48Z2014-04-09T09:34:01ZCDS support team

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

cds-question@unistra.frh-ii-regionsmagellanic-cloudsWe exploit ionization-parameter mapping (IPM) as a powerful tool to measure the optical depth of star-forming H II regions. Our simulations using the photoionization code CLOUDY and our new, SURFBRIGHT surface-brightness simulator demonstrate that this technique can directly diagnose most density-bounded, optically thin nebulae using spatially resolved emission-line data. We apply this method to the Large and Small Magellanic Clouds (LMC and SMC), using the data from the Magellanic Clouds Emission Line Survey. We generate new H II region catalogs based on photoionization criteria set by the observed ionization structure in the [S II]/[O III] ratio and H{alpha} surface brightness. The luminosity functions from these catalogs generally agree with those from H{alpha}-only surveys. We then use IPM to crudely classify all the nebulae into optically thick versus optically thin categories, yielding fundamental new insights into Lyman-continuum (LyC) radiation transfer.2012ApJ...755...40Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/755/40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/232 : Nebulae in the Magellanic Clouds (Davies+ 1976)J/A+A/509/A11 : SMC clusters H{alpha} emission-line objects (Martayan+, 2010)J/ApJS/184/1 : Molecular clouds in the LMC by NANTEN. II. (Kawamura+, 2009)J/ApJ/566/880 : ISO-SWS observations of H II regions (Giveon+, 2002)J/MNRAS/311/741 : SMC emission-line objects (Murphy+, 2000)J/AJ/117/238 : LMC extended catalog (Bica+, 1999)J/A+A/280/365 : H-alpha Survey of SMC (Le Coarer+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/755/40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/755/40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/755/40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/755/40https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/755/40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/755/40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/755/40/table5 (Magellanic Clouds Emission Line Survey (MCELS) LMC HII region catalog (from erratum: 2013, ApJ, 766, 138))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/40/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/40/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/40/table5?GETtext/xml+votable180.050000true71.24875-69.0561110.005555555555555556Cone search capability for table J/ApJ/755/40/table6 (Magellanic Clouds Emission Line Survey (MCELS) SMC HII region catalog (from erratum: 2013, ApJ, 766, 138))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/40/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/40/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/40/table6?GETtext/xml+votable180.050000true7.92125-73.7941670.0055555555555555565/8263 8269 8273 8274 8275 8276 8278 8280 8281 8323 6/33051 33073 33090 33091 33110 33116 33136 33297 33298 33299 33304 33306 33307 33313 33316 33317 33319 33328 33330https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/755/40?format=asciiOpticaldefaultJ/ApJ/755/40/table5Magellanic Clouds Emission Line Survey (MCELS) LMC HII region catalog (from erratum: 2013, ApJ, 766, 138)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMCELSObject identifier (LNNN for LMC or SNNN)meta.id;meta.maincharONameOther identifier (1)meta.idcharf_OName[cd] More identifier flag (2)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainType? Region type (3)src.classintnullableNHI[0/14] Column density of H I1e+21cm**-2phys.columnDensityfloatlogL[33/40] Log H{alpha} luminosity; erg/slog(1e-07W)phys.luminosity;em.line.Halphafloatf_logL[ef] Flag on logL (4)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/755/40/table6Magellanic Clouds Emission Line Survey (MCELS) SMC HII region catalog (from erratum: 2013, ApJ, 766, 138)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMCELSObject identifier (LNNN for LMC or SNNN)meta.id;meta.maincharONameOther identifier (1)meta.idcharf_OName[cd] More identifier flag (2)meta.codecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainType? Region type (3)src.classintnullableNHI[0/14] Column density of H I1e+21cm**-2phys.columnDensityfloatlogL[33/40] Log H{alpha} luminosity; erg/slog(1e-07W)phys.luminosity;em.line.Halphafloatf_logL[ef] Flag on logL (4)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar