J/A+A/668/A74ivo://CDS.VizieR/J/A+A/668/A74doi:10.26093/cds/vizier.36680074CDSMicheva G.Roth M.M.Weilbacher P.M.Morisset C.Castro N.,Monreal Ibero A.Soemitro A.A.Maseda M.V.Steinmetz M.Brinchmann J.2024-11-06T20:01:55Z2022-12-07T07:29:00ZCDS support team

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

cds-question@unistra.frh-ii-regionschemical-abundancesextinctiongalaxy-kinematicsspectroscopyThere are known differences between the physical properties of HII and diffuse ionized gas (DIG). However, most of the studied regions in the literature are relatively bright, with log10 L(H{alpha})[erg/s]>~37. We compiled an extremely faint sample of 390 HII regions with a median H{alpha} luminosity of 34.7 in the flocculent spiral galaxy NGC 300, derived their physical properties in terms of metallicity, density, extinction, and kinematics, and performed a comparative analysis of the properties of the DIG. We used MUSE data of nine fields in NGC 300, covering a galactocentric distance of zero to ~450 arcsec (~4 projected kpc), including spiral arm and inter-arm regions. We binned the data in dendrogram leaves and extracted all strong nebular emission lines. We identified HII and DIG regions and compared their electron densities, metallicity, extinction, and kinematic properties. We also tested the effectiveness of unsupervised machine-learning algorithms in distinguishing between the HII and DIG regions. The gas density in the HII and DIG regions is close to the low-density limit in all fields. The average velocity dispersion in the DIG is higher than in the HII regions, which can be explained by the DIG being 1.8kK hotter than HII gas. The DIG manifests a lower ionization parameter than HII gas, and the DIG fractions vary between 15-77%, with strong evidence of a contribution by hot low-mass evolved stars and shocks to the DIG ionization. Most of the DIG is consistent with no extinction and an oxygen metallicity that is indistinguishable from that of the HII gas. We observe a flat metallicity profile in the central region of NGC 300, without a sign of a gradient. The differences between extremely faint HII and DIG regions follow the same trends and correlations as their much brighter cousins. Both types of objects are so heterogeneous, however, that the differences within each class are larger than the differences between the two classes.2022A&A...668A..74Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/668/A74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/618/A3 : NGC 300 MUSE spectroscopy for central fields (Roth+, 2018)J/ApJ/789/81 : Multiwavelength survey of HII regions in NGC 300 (Faesi+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/668/A74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/668/A74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/668/A74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/668/A74https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/668/A74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/668/A74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/668/A74/ngc300 (Extremely faint HII and diffuse ionized gas (DIG) regions from MUSE data of nine fields in NGC 300)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/668/A74/ngc300?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/668/A74/ngc300?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/668/A74/ngc300?GETtext/xml+votable180.050000true13.7291901276321-37.68889166842120.0055555555555555566/35536 35538https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/668/A74?format=asciidefaultJ/A+A/668/A74/ngc300Extremely faint HII and diffuse ionized gas (DIG) regions from MUSE data of nine fields in NGC 300recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[HII DIG] Classification into HII or DIGsrc.classcharFieldField identifier, one of A,B,C,D,E,I,J,P,Qmeta.id;obs.fieldcharNpix[10/36108] Number of pixels inside of the dendrogram leaf and ring mask for HII and DIG, respectively.meta.numberintXpeak[1.0/915.0] X pixel coordinate of the peak flux pixel inside of the HII regionpixpos.cartesian.x;stat.maxfloatYpeak[3.0/323.0] Y pixel coordinate of the peak flux pixel inside of the HII regionpixpos.cartesian.y;stat.maxfloatFpeak? Flux inside of the brightest pixel of the dendrogram or ring maskmW.m**-2phot.fluxdoublenullableRAJ2000[13.58/13.74] Right Ascension (J2000) of the peak pixeldegpos.eq.ra;meta.mainDEJ2000[-37.72/-37.59] Declination (J2000) of the peak pixeldegpos.eq.dec;meta.mainM13-12logOH[8.24/8.77]? 12+logO/H metallicity with the Marino et al. (2013, Cat. J/A+A/559/A114) calibration of the O3N2 strong-line methodphys.abunddoublenullablee_gasSigma[0.12/156.96] Error in Gas velocity dispersion from pPXFkm/sstat.errordoublegasE(B-V)E(B-V) of the gasmagphot.color.excessdoublee_gasE(B-V)Error in E(B-V) of the gasmagstat.errordoubleHalpha? H{alpha} (6562.791{AA}) line fluxmW.m**-2phot.flux;spect.linedoublenullablee_Halpha? Error in Halpha (6562.791{AA}) line fluxmW.m**-2stat.error;spect.linedoublenullableHbeta? H{beta} (4861.32{AA}) line fluxmW.m**-2phot.flux;spect.linedoublenullablee_Hbeta? Error in Hbeta (4861.32{AA}) line fluxmW.m**-2stat.error;spect.linedoublenullableSII6716? [SII]6716.44{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_SII6716? Error in [SII]6716.44{AA} line fluxmW.m**-2stat.errordoublenullableSII6731? [SII]6730.816{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_SII6731? Error in [SII]6730.816{AA} line fluxmW.m**-2stat.errordoublenullableOII7320? [OII]7319.99{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_OII7320? Error in [OII]7319.99{AA} line fluxmW.m**-2stat.errordoublenullableOII7330? [OII]7330.73{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_OII7330? Error in [OII]7330.73{AA} line fluxmW.m**-2stat.errordoublenullablee_P16-12logOH[0.0/2.18]? Non-symmetric lower error in the 12+logO/H metallicity with the Pilyugin & Grebel (2016MNRAS.457.3678P) S-calibrationstat.errordoublenullableE_P16-12logOH[0.0/0.49]? Non-symmetric upper error in the 12+logO/H metallicity with the Pilyugin & Grebel (2016MNRAS.457.3678P) S-calibrationstat.error;stat.maxdoublenullableLumHa[33.16/37.27]? Log10 of the Luminosity of Halpha [erg/s] line flux1e-07Wphys.luminosity;em.line.Halphadoublenullablee_LumHa[0.0/0.77]? Error in Log10 of the Luminosity of Halpha [erg/s] line flux1e-07Wstat.errordoublenullablegaldist[3.05/486.77] Galactocentric distance to the Xpeak,Ypeak coordinatesarcsecpos.distance;pos.galactocentricdoublegasV[111.92/237.43] Gas velocity from pPXFkm/sphys.velocdoublee_gasV[0.05/11.19] Error in Gas velocity from pPXFkm/sstat.errordoublegasSigma[0.99/64.44] Gas velocity dispersion from pPXFkm/sphys.veloc.dispersiondoubleSIII6312? [SIII]6312.06{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_SIII6312? Error in [SIII]6312.06{AA} line fluxmW.m**-2stat.errordoublenullableSIII9068? [ArIII]7135.79{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_SIII9068? Error in [ArIII]7135.79{AA} line fluxmW.m**-2stat.errordoublenullableArIII7136? [SIII]9068{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_ArIII7136? Error in [SIII]9068{AA} line fluxmW.m**-2stat.errordoublenullableOIII5007? [OIII]5006.843{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_OIII5007? Error in [OIII]5006.843{AA} line fluxmW.m**-2stat.errordoublenullableNII6583? [NII]6583.45{AA} line fluxmW.m**-2phot.flux;spect.linedoublenullablee_NII6583? Error in [NII]6583.45{AA} line fluxmW.m**-2stat.errordoublenullablee_M13-12logOH[0.0/8.77]? Non-symmetric lower error in the 12+logO/H metallicity with the Marino et al. (2013, Cat. J/A+A/559/A114) calibration of the O3N2 strong-line methodstat.errordoublenullableE_M13-12logOH[0.0/0.62]? Non-symmetric upper error in the 12+logO/H metallicity with the Marino et al. (2013, Cat. J/A+A/559/A114) calibration of the O3N2 strong-line methodstat.error;stat.maxdoublenullableP16-12logOH[7.74/9.4]? 12+logO/H metallicity with the Pilyugin & Grebel (2016MNRAS.457.3678P) S-calibrationphys.abunddoublenullable