J/ApJ/842/97ivo://CDS.VizieR/J/ApJ/842/97doi:10.26093/cds/vizier.18420097CDSLin Z.Hu N.Kong X.Gao Y.Zou H.Wang E.Cheng F.Fang G.Lin L.,Wang J.2019-12-10T06:31:34Z2018-03-06T14:57:47ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopyh-ii-regionschemical-abundancesastronomical-object-identificationThe spectra of 413 star-forming (or H II) regions in M33 (NGC 598) were observed using the multifiber spectrograph of Hectospec at the 6.5m Multiple Mirror Telescope. Using this homogeneous spectra sample, we measured the intensities of emission lines and some physical parameters, such as electron temperatures, electron densities, and metallicities. Oxygen abundances were derived via the direct method (when available) and two empirical strong-line methods, namely, O3N2 and N2. At the high-metallicity end, oxygen abundances derived from the O3N2 calibration were higher than those derived from the N2 index, indicating an inconsistency between O3N2 and N2 calibrations. We present a detailed analysis of the spatial distribution of gas-phase oxygen abundances in M33 and confirm the existence of the axisymmetric global metallicity distribution that is widely assumed in the literature. Local variations were also observed and subsequently associated with spiral structures to provide evidence of radial migration driven by arms. Our O/H gradient fitted out to 1.1 R_25_ resulted in slopes of -0.17+/-0.03, -0.19+/-0.01, and -0.16+/-0.17dex R_25_^-1^, utilizing abundances from O3N2, N2 diagnostics, and a direct method, respectively.2017ApJ...842...97Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/842/97CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/110/2739 : H-alpha emitting regions in M33 (Calzetti+ 1995)J/A+AS/123/159 : IRON Project. XXII. C and O radiative rates (Galavis+ 1997)J/ApJS/123/311 : Excitation rate coefficients for O III (Aggarwal+, 1999)J/ApJS/120/247 : Supernova remnants in M33 (Gordon+, 1999)J/PASP/111/685 : HII regions of M33. II. (Hodge+, 1999)J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007)J/ApJS/174/366 : Chandra ACIS survey of M33 (ChaSeM33) (Plucinsky+, 2008)J/ApJ/675/1213 : Abundances in M33 HII regions (Rosolowsky+, 2008)J/ApJ/700/654 : Keck spectroscopy of extragalactic HII regions (Esteban+ 2009)J/A+A/512/A63 : Abundances of M33 HII regions (Magrini+, 2010)J/ApJS/188/32 : Breit-Pauli transition probabilities for SII (Tayal+, 2010)J/A+A/552/A140 : SEDs of M33 HII regions (Relano+, 2013)J/A+A/559/A114 : Updated O3N2 and N2 abundance indicators (Marino+, 2013)J/A+A/586/A37 : M33 center and BCLMP302 [CII] spectroscopy (Mookerjea+, 2016)J/A+A/595/A43 : Photometry of 119 HII regions in M33 (Relano+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/842/97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/842/97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/842/97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/842/97https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/842/97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/842/97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/842/97/hiireg (Reddening-corrected emission line fluxes, physical conditions and metallicity of HII regions in M33 (tables 1-3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/842/97/hiireg?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/842/97/hiireg?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/842/97/hiireg?GETtext/xml+votable180.050000true23.1097530.50302780.0055555555555555566/2154 2155 2240 2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/842/97?format=asciiOpticaldefaultJ/ApJ/842/97/hiiregReddening-corrected emission line fluxes, physical conditions and metallicity of HII regions in M33 (tables 1-3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification of HII region (1)meta.id;meta.mainintName? HII region name from published catalog (2)meta.id.crosscharRAJ2000[1] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[30/31] Degree of Declination (J2000)pos.eq.dec;meta.mainR[0.1/8] Physical distance to the center of M33 (3)kpcpos.distancefloatR/R25[0.02/1.1] R to R25 ratio (4)stat.fit.omcfloatPAPosition angle (5)degpos.posAngfloatFO3[1/2]? Flag of [OIII]4363 detection (6)meta.codeintnullableFN2[1/2]? Flag of [NII]5755 detection (6)meta.codeintnullableFn[1/3] Flag of the observed night (7)meta.codeint[OII]3727[0.1/10.5]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OII]3727[0.01/0.3]? Uncertainty in fluxstat.errorfloatnullable[NeIII]3869[0.05/1.4]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[NeIII]3869[0.004/0.3]? Uncertainty in fluxstat.errorfloatnullableHdelta4102[0.1/1.2]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_Hdelta4102[0.004/0.3]? Uncertainty in fluxstat.errorfloatnullableHgamma4340[0.3/1]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_Hgamma4340[0.008/0.2]? Uncertainty in fluxstat.errorfloatnullable[OIII]4363[0.002/0.4]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OIII]4363[0.001/0.05]? Uncertainty in fluxstat.errorfloatnullable[OIII]4959[0.01/3]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OIII]4959[0.001/0.04]? Uncertainty in fluxstat.errorfloatnullable[OIII]5007[0.04/9]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OIII]5007[0.002/0.2]? Uncertainty in fluxstat.errorfloatnullable[NII]5755[0.001/0.3]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[NII]5755[0/0.06]? Uncertainty in fluxstat.errorfloatnullableHeI5876[0.02/0.6]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_HeI5876[0.001/0.07]? Uncertainty in fluxstat.errorfloatnullable[OI]6300[0.005/1.1]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OI]6300[0/0.1]? Uncertainty in fluxstat.errorfloatnullable[NII]6548[0.01/0.6]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[NII]6548[0/0.03]? Uncertainty in fluxstat.errorfloatnullableHalpha6563[1.3/3]Emission line flux (8)spect.line.intensity;arith.ratiofloate_Halpha6563[0.02/0.1] Uncertainty in fluxstat.errorfloat[NII]6583[0.04/1.5]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[NII]6583[0.001/0.08]? Uncertainty in fluxstat.errorfloatnullable[SII]6717[0.004/2] Emission line flux (8)spect.line.intensity;arith.ratiofloate_[SII]6717[0.001/0.08] Uncertainty in fluxstat.errorfloat[SII]6731[0.008/1.7]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[SII]6731[0.001/0.08]? Uncertainty in fluxstat.errorfloatnullable[ArIII]7135[0.005/0.2]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[ArIII]7135[0/0.06]? Uncertainty in fluxstat.errorfloatnullable[OII]7320[0.005/0.2]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OII]7320[0/0.04]? Uncertainty in fluxstat.errorfloatnullable[OII]7330[0.005/0.3]? Emission line flux (8)spect.line.intensity;arith.ratiofloatnullablee_[OII]7330[0/0.03]? Uncertainty in fluxstat.errorfloatnullableHbeta4861[9/13572] Hbeta flux; 1e-17erg/s/cm^2^1e-20W.m**-2phot.flux;em.line.Hbetafloate_Hbeta4861[0.3/1313] Uncertainty of Hbeta48611e-20W.m**-2stat.errorfloatEW(Hbeta)[2/2405]? Equivalent width of Hbeta; Angstrom (9)0.1nmspect.line.eqWidth;em.line.HbetafloatnullableE(B-V)[0.0001/1.6]? Color excessmagphot.color.excessfloatnullableRVel[-117/119] Radial velocity (10)km/sphys.veloc;pos.heliocentricfloatTe[OIII][6600/68700]? Electron temperature derived from [OIII] auroral lineKphys.temperature.electron;phys.electronintnullablee_Te[OIII][100/21500]? Lower error of Te[OIII]Kstat.errorintnullableE_Te[OIII][100/46600]? Upper error of Te[OIII]Kstat.error;stat.maxintnullableTe[NII][6400/95100]? Electron temperature derived from [NII] auroral lineKphys.temperature.electron;phys.electronintnullablee_Te[NII][300/24000]? Lower error of Te[NII]Kstat.errorintnullableE_Te[NII][300/50000]? Upper error of Te[NII]Kstat.error;stat.maxintnullablene[1/1549]? Electron densitycm**-3phys.density;phys.electronintnullablee_ne[0/382]? Lower error of necm**-3stat.errorintnullableE_ne[12/898]? Upper error of necm**-3stat.error;stat.maxintnullableZO[Te][7/9.1]? Oxygen abundance derived from Te methodphys.abundfloatnullablee_ZO[Te][0.01/0.3]? Lower error of ZO[Te]stat.errorfloatnullableE_ZO[Te][0.01/0.7]? Upper error of ZO[Te]stat.error;stat.maxfloatnullableZO[O3N2][8.1/8.7]? Oxygen abundance derived from O3N2 calibration (11)phys.abundfloatnullablee_ZO[O3N2][0.002/0.05]? Lower error of ZO[O3N2]stat.errorfloatnullableE_ZO[O3N2][0.002/0.08]? Upper error of ZO[O3N2]stat.error;stat.maxfloatnullableZO[N2][8/8.7]? Oxygen abundance derived from N2 calibration (12)phys.abundfloatnullablee_ZO[N2][0.004/0.2]? Lower error ZO[N2]stat.errorfloatnullableE_ZO[N2][0.003/0.1]? Upper error ZO[N2]stat.error;stat.maxfloatnullableZN[Te][6.4/8]? Nitrogen abundance derived from Te methodphys.abundfloatnullablee_ZN[Te][0.03/0.3]? Lower error ZN[Te]stat.errorfloatnullableE_ZN[Te][0.03/0.8]? Upper error ZN[Te]stat.error;stat.maxfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar