J/A+A/712/A19ivo://CDS.VizieR/J/A+A/712/A19CDSIzotov Y.I.Guseva N.G.Schaerer D.Amorin R.O2026-07-30T12:36:53Z2026-07-30T13:36:02ZCDS support team

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

cds-question@unistra.frgalaxiesultraviolet-astronomyvisible-astronomyinfrared-astronomyspectroscopyphotometrychemical-abundancesline-intensitiesWe present Very Large Telescope/Xshooter spectrophotometric observations of eleven low-redshift (z<0.085) compact star-forming galaxies (the high O 32 sample). These galaxies are characterised by extremely high emission-line ratios, [O III]5007/[O II]3727, ranging from 11 to 42. Galaxies with such high ratios are promising candidates for leaking large amounts of Lyman continuum radiation. They are characterised by low oxygen abundances, 12+log(O/H)=7.5-8.0, and low stellar masses, M*~10^6^-10^8^M_{sun}. We used strong emission lines of various ions in all spectra to derive helium and oxygen abundances and N/O, Ne/O, S/O, Cl/O, Ar/O, and Fe/O abundance ratios. We also derived macroscopic velocity dispersions, sigma(lambda), from various emission lines of different ions. We find that sigma(4861) of the Hbeta emission line increases with increasing stellar mass and decreasing O 32 ratio. In contrast, sigma(lambda)/sigma(4861) ratios for various lines are close to unity. Exceptions are the sigma(lambda)/sigma(4861) of two lines, HeII 4686 and HeI 10830, which are considerably higher than unity, and those of four lines, [OII] 3726, 3729, [SII] 6717, and 6731, for which sigma(lambda)/sigma(4861) is lower than unity. The HeII 4686 and He I 10830 lines are likely produced in the inner parts of HII regions and are broadened by dynamical processes generated by massive stars, and, in the case of the HeI 10830 emission line, by radiative scattering. Emission in the [OII] and [SII] lines is produced mainly in the outer and likely more quieter parts of HII regions.2026A&A...712A..19Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/712/A19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/688/A159 : Blueberry galaxies up to 200Mpc (Kouroumpatzakis+, 2024)J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)J/MNRAS/442/3565 : L-{sigma} relation for massive star formation (Chavez+,2014)J/ApJ/893/96 : CHAOS IV: NGC3184 LBT obs. & 3 other gal. abundancesJ/ApJ/847/38 : Extreme emission line galaxies at z<~0.05 (Yang+, 2017)J/ApJ/803/34 : z~4-10 galaxies from HST legacy fields (Bouwens+, 2015)J/ApJ/602/200 : HII regions abundances in blue compact galaxiesJ/ApJS/261/31 : COS Legacy Archive Sp. Survey (CLASSY) treasury (Berg+,2022)J/ApJS/161/240 : High-ionization emission in metal-deficient BCDshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/712/A19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/712/A19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/712/A19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/712/A19https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/712/A19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/712/A19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/712/A19/table1 (General characteristics of CSFGs galaxies derived from SDSS spectra and GALEX photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/712/A19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/712/A19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/712/A19/table1?GETtext/xml+votable180.050000true1.8522.44091670.0055555555555555566/4707 8628 18247 19461 25851 26098 26165 26427 26520 367853.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/712/A19?format=asciiUVOpticalInfrareddefaultJ/A+A/712/A19/table1General characteristics of CSFGs galaxies derived from SDSS spectra and GALEX photometrySimbadNameSimbad column added by the CDSmeta.idcharnullableNameGalaxy CSFGs name (Name)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSDisplay the SDSS dr16 of Ahumada et al. 2020ApJS..249....3A, Cat. V/154meta.ref.urlcharGALEXDisplay the Revised catalog of GALEX UV sources of Bianchi et al. 2017ApJS..230...24B, Cat. II/335meta.ref.urlcharRAJ2000Right ascension (J2000) (RA)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (Dec)pos.eq.dec;meta.mainzRedshift (Redshift)src.redshiftdoublegmagSDSS g-band magnitude (g)magphot.mag;em.opt.BfloatA(O)Oxygen abundance derived by the direct Te-method from the Xshooter spectrum (12+log(O/H))phys.abundfloatEWHbRest-frame equivalent width of the H{beta} emission line in the Xshooter spectrum (EW(H_{beta}_)0.1nmspect.line.eqWidthintO32The oxygen line ratio O32 as [OIII]{lambda}5007/[OII]{lambda}3727 (O_32_)meta.noteintlogM*The stellar mass (logM*)log(solMass)phys.massfloatlogXiThe logarithm of the production efficiency of ionizing photons (log{Xi}_ion_)log(1e+07Hz.J**-1)phys.ionizParam.radfloatJ/A+A/712/A19/tableb1aEmission-line fluxes in 11 galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLambdaRest-frame wavelength of the emission line (Lambda)nmem.wl;spect.linedoubleF01Flux of the emission line relative to Hbeta emission line in the galaxy J0007+0226 (F01)phot.flux;spect.line;arith.ratiofloate_F01Flux error of the emission line relative to Hbeta emission line in the galaxy J0007+0226 (EF01)stat.errorfloatF02Flux of the emission line relative to Hbeta emission line in the galaxy J0009+0234 (F02)phot.flux;spect.line;arith.ratiofloate_F02Flux error of the emission line relative to Hbeta emission line in the galaxy J0009+0234 (EF02)stat.errorfloatF03Flux of the emission line relative to Hbeta emission line in the galaxy J0159+0751 (F03)phot.flux;arith.ratio;spect.linefloate_F03Flux error of the emission line relative to Hbeta emission line in the galaxy J0159+0751 (EF03)stat.errorfloatF04Flux of the emission line relative to Hbeta emission line in the galaxy J0240-0828 (F04)phot.flux;spect.line;arith.ratiofloate_F04Flux error of the emission line relative to Hbeta emission line in the galaxy J0240-0828 (EF04)stat.errorfloatF05Flux of the emission line relative to Hbeta emission line in the galaxy J0825+1846 (F05)phot.flux;spect.line;arith.ratiofloate_F05Flux error of the emission line relative to Hbeta emission line in the galaxy J0825+1846 (EF05)stat.errorfloatF06Flux of the emission line relative to Hbeta emission line in the galaxy J1255-0213 (F06)phot.flux;spect.line;arith.ratiofloate_F06Flux error of the emission line relative to Hbeta emission line in the galaxy J1255-0213 (EF06)stat.errorfloatF07Flux of the emission line relative to Hbeta emission line in the galaxy J1310+0852 (F07)phot.flux;spect.line;arith.ratiofloate_F07Flux error of the emission line relative to Hbeta emission line in the galaxy J1310+0852 (EF07)stat.errorfloatF08Flux of the emission line relative to Hbeta emission line in the galaxy J1323-0132 (F08)phot.flux;arith.ratio;spect.linefloate_F08Flux error of the emission line relative to Hbeta emission line in the galaxy J1323-0132 (EF08)stat.errorfloatF09Flux of the emission line relative to Hbeta emission line in the galaxy J1325+0744 (F09)phot.flux;arith.ratio;spect.linefloate_F09Flux error of the emission line relative to Hbeta emission line in the galaxy J1325+0744 (EF09)stat.errorfloatF10Flux of the emission line relative to Hbeta emission line in the galaxy J1411+0550 (F10)phot.flux;spect.line;arith.ratiofloate_F10Flux error of the emission line relative to Hbeta emission line in the galaxy J1411+0550 (EF10)stat.errorfloatF11Flux of the emission line relative to Hbeta emission line in the galaxy J1526+2113 (F11)phot.flux;spect.line;arith.ratiofloate_F11Flux error of the emission line relative to Hbeta emission line in the galaxy J1526+2113 (EF11)stat.errorfloatLineName of the emission line (Line)meta.id;spect.linecharJ/A+A/712/A19/tableb1bExtinction coefficients, rest-frame equivalent widths and the observed fluxes of the Hbeta emission line in 11 galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the galaxy (Name)meta.id;meta.maincharCHbExtinction coefficient derived from the decrement of hydrogen Balmer emission lines (CHB)phys.absorptionfloate_CHbError of extinction coefficient derived from the decrement of hydrogen Balmer emission lines (ECHB)stat.errorfloatEWHbRest-frame equivalent width of the Hbeta emission line (EWHB)nmspect.line.eqWidth;em.line.Hbetafloate_EWHbError of the rest-frame equivalent width of the Hbeta emission line (EEWHB)nmstat.errorfloatFHbObserved flux of the Hbeta emission line (FHB)W.m**-2phot.flux;em.line.Hbetadoublee_FHbError of observed flux of the Hbeta emission line (EFHB)W.m**-2stat.errorfloatJ/A+A/712/A19/tableb2Chemical abundances in 11 galaxiesneHE5Electron number density for HeII ion derived from five HeI emission lines (NEHE5)cm**-3phys.densityintCl2+/H+The Cl2+/H+ abundance ratio (CL2P)phys.abunddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTOIIIElectron temperature for OIII ion (TOIII)Kphys.temperature.electron;phys.electroninte_TOIIIError of the electron temperature for OIII ion (ETOIII)Kstat.errorintTOIIElectron temperature for OII ion (TOII)Kphys.temperature.electron;phys.electroninte_TOIIError of the electron temperature for OII ion (ETOII)Kstat.errorintTSIIIElectron temperature for SIII ion (TSIII)Kphys.temperature.electron;phys.electroninte_TSIIIError of the electron temperature for SIII ion (ETSIII)Kstat.errorintnSIIElectron number density derived from the [SII] 671.7/673.1 emission-line ratio (NSII)cm**-3phys.densityinte_nSIIError of the electron number density derived from the [SII] 671.7/673.1 emission-line ratio (ENSII)cm**-3stat.errorintnOIIElectron number density derived from the [OII] 327.6/327.9 emission-line ratio (NOII)cm**-3phys.densityinte_nOIIError of the electron number density derived from the [OII] 327.6/327.9 emission-line ratio (ENOII)cm**-3stat.errorintTHE5Electron temperature for HeII ion derived from five HeI emission lines (THE5)Kphys.temperature.electron;phys.electronintTau5Optical depth in He I 3889 emission line derived from five HeI emission lines (TAU5)phys.absorption.opticalDepthfloatY5Weighted mean He mass fraction derived from derived from five HeI emission lines (Y5)phys.mass;arith.ratiofloatTHE6Electron temperature for HeII ion derived from six HeI emission lines (THE6)Kphys.temperature.electron;phys.electronintneHE6Electron number density for HeII ion derived from six HeI emission lines (NEHE6)cm**-3phys.densityintTau6Optical depth in in He I 3889 emission line derived from six HeI emission lines (TAU6)phys.absorption.opticalDepthfloatY6Weighted mean He mass fraction derived from derived from six HeI emission lines (Y6)phys.mass;arith.ratiofloatO+/H+The O+/H+ abundance ratio (OP)phys.abunddoublee_O+/H+Error of O+/H+ abundance ratio (EOP)stat.error;phys.abunddoubleO2+/H+The O2+/H+ abundance ratio (O2P)phys.abunddoublee_O2+/H+Error of O2+/H+ abundance ratio (EO2P)stat.error;phys.abunddoubleO3+/H+The O3+/H+ abundance ratio (O3P)phys.abunddoublee_O3+/H+Error of O3+/H+ abundance ratio (EO3P)stat.error;phys.abunddoubleA(O)The total oxygen abundance 12+log(O/H) (O)phys.abundfloate_A(O)Error of total oxygen abundance 12+log(O/H) (EO)stat.errorfloatN+/H+The N+/H+ abundance ratio (NP)phys.abunddoublee_N+/H+Error of N+/H+ abundance ratio (ENP)stat.error;phys.abunddoubleICF(N)Ionisation correction factor ICF(N) of nitrogen (ICFN)arith.factorfloatlog(N/O)The logarithm of N/O abundance ratio (NO)phys.abundfloate_log(N/O)Error of log(N/O) abundance ratio (ENO)stat.errorfloatNe2+/H+The Ne2+/H+ abundance ratio (NE2P)phys.abunddoublee_Ne2+/H+Error of Ne2+/H+ abundance ratio (ENE2P)stat.error;phys.abunddoubleICF(NE)Ionisation correction factor ICF(Ne) of neon (ICFNE)arith.factorfloatlog(NE/O)The logaritm of Ne/O abundance ratio (NEO)phys.abundfloate_log(NE/O)Error of log of Ne/O abundance ratio (ENEO)stat.errorfloatS+/H+The S+/H+ abundance ratio (SP)phys.abunddoublee_S+/H+Error of S+/H+ abundance ratio (ESP)stat.error;phys.abunddoubleS2+/H+6312The S2+/H+ abundance ratio derived from [SIII]631.2 emission line (S2P6312)phys.abunddoublee_S2+/H+6312Error of S2+/H+ abundance ratio derived from [SIII]631.2 emission line (ES2P6312)stat.errordoubleICF(S)Ionisation correction factor ICF(S) of sulfur (ICFS)arith.factorfloatlog(S/O6312)The logarithm of S/O abundance ratio using [SIII]631.2 emission line (SO6312)phys.abundfloate_log(S/O6312)Error of log of S/O abundance ratio using [SIII]631.2 emission line (ESO6312)stat.errorfloatS2+/H+9069The S2+/H+ abundance ratio derived from [SIII]906.9 emission line (S2P9069)phys.abunddoublee_S2+/H+9069Error of S2+/H+ abundance ratio using [SIII]906.9 emission line (ES2P9069)stat.errordoublelog(S/O9069)The logarithm of S/O abundance ratio using [SIII]906.9 emission line (SO9069)phys.abundfloate_log(S/O9069)Error of log of S/O abundance ratio using [SIII]906.9 emission line (ESO9069)stat.errorfloatS2+/H+9531The S2+/H+ abundance ratio derived from [SIII]953.1 emission line (S2P9531)phys.abunddoublee_S2+/H+9531Error of S2+/H+ abundance ratio using [SIII]953.1 emission line (ES2P9531)stat.errordoublelog(S/O9531)The logarithm of S/O abundance ratio using [SIII]953.1 emission line (SO9531)phys.abundfloate_log(S/O9531)Error of log(S/O9531) abundance ratio using [SIII]953.1 emission line (ESO9531)stat.errorfloate_Cl2+/H+Error of Cl2+/H+ abundance ratio (ECL2P)stat.error;phys.abunddoubleICF(Cl)Ionisation correction factor ICF(Cl) of chlorine (ICFCL)arith.factorfloatlog(Cl/O)The logarithm of Cl/O abundance ratio (CLO)phys.abundfloate_log(Cl/O)Error of log(Cl/O) abundance ratio (ECLO)stat.errorfloatAr2+/H+The Ar2+/H+ abundance ratio (AR2P)phys.abunddoublee_Ar2+/H+Error of Ar2+/H+ abundance ratio (EAR2P)stat.error;phys.abunddoubleAr3+/H+The Ar3+/H+ abundance ratio (AR3P)phys.abunddoublee_Ar3+/H+Error of Ar3+/H+ abundance ratio (EAR3P)stat.error;phys.abunddoubleICF(Ar)Ionisation correction factor ICF(Ar) of argon (ICFAR)arith.factorfloatlog(Ar/O)The logarithm of Ar/O abundance ratio (ARO)phys.abundfloate_log(Ar/O)Error of log(Ar/O) abundance ratio (EARO)stat.errorfloatFe2+/H+4658The Fe2+/H+ abundance ratio derived from [FeIII]465.8 emission line (FE2P466)phys.abunddoublee_Fe2+/H+4658Error of Fe2+/H+ abundance ratio derived from [FeIII]465.8 emission line (EFE2P466)stat.errordoubleICF(Fe4658)Ionisation correction factor ICF(Fe) using [FeIII]465.8 emission line (ICFFE466)arith.factorfloatlog(Fe/O)4658The logarithm of Fe/O abundance ratio using [FeIII]465.8 emission line (FEO466)phys.abundfloate_log(Fe/O)4658Error of log of Fe/O abundance ratio using [FeIII]465.8 emission line (EFEO466)stat.errorfloatFe2+/H+The Fe2+/H+ abundance ratio derived from [FeIII]498.8 emission line (FE2P499)phys.abunddoublee_Fe2+/H+Error of Fe2+/H+ abundance ratio derived from [FeIII]498.8 emission line (EFE2P499)stat.error;phys.abunddoubleICF(Fe4998)Ionisation correction factor ICF(Fe) of iron (ICFFE499)arith.factorfloatlog(Fe/O)4998The logarithm of Fe/O abundance ratio using [FeIII]499.8 emission line (FEO499)phys.abundfloate_log(Fe/O)4998Error of log(Fe/O) abundance ratio using [FeIII]499.8 emission line (EFEO499)stat.errorfloatNameName of the galaxy (Name)meta.id;meta.mainchar