J/ApJ/662/15ivo://CDS.VizieR/J/ApJ/662/15doi:10.26093/cds/vizier.16620015CDSIzotov Y.I.Thuan T.X.Stasinska G.2017-07-03T14:25:38Z2009-12-08T10:46:05ZCDS support team

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

cds-question@unistra.frh-ii-regionschemical-abundancesline-intensitiesWe determine the primordial helium mass fraction Yp using 93 spectra of 86 low-metallicity extragalactic HII regions. This sample constitutes the largest and most homogeneous high-quality data set in existence for the determination of Yp. For comparison, and to improve the statistics in our investigation of systematic effects affecting the Yp determination, we have also considered a sample of 271 low-metallicity HII regions selected from Data Release 5 of the Sloan Digital Sky Survey. Although this larger sample shows more scatter, it gives results that are consistent at the 2{sigma} level with our original sample. We have considered known systematic effects that may affect the ^4^He abundance determination.2007ApJ...662...15Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/662/15CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/602/200 : HII regions abundances in blue compact galaxies (Izotov+ 2004)J/ApJS/170/251 : Multiplet table for ^4^He (Drake+, 2007)http://www.sdss.org/ : SDSS Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/662/15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/662/15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/662/15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/662/15https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/662/15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/662/15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/662/15/sample1 (HeBCD sample list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/662/15/sample1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/662/15/sample1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/662/15/sample1?GETtext/xml+votable180.050000true146.007917-0.6422220.005555555555555556Cone search capability for table J/ApJ/662/15/sample2 (SDSS DR5 sample list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/662/15/sample2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/662/15/sample2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/662/15/sample2?GETtext/xml+votable180.050000true147.475590.616290.0055555555555555566/38 1700 2109 2258 4096 4181 4730 4758 4891 5026 5082 5100 5109 5203 5223 5246 5290 5295 5359 5366 5407 5419 5440 5487 5504 5531 5534 5545 5556 5590 5592 5623 5624 5637 5661 5669 5704 5706 5731 5750 5764 5825 5927 5940 5967 5971 5998 6005 6010 6011 6046 6075 6085 6114 6128 6361 6385 6396 6402 6470 6496 6619 6649 6995 7172 7185 7190 7208 7243 7251 7252 7259 7261 7265 7266 7272 7281 7315 7328 7381 7431 7512 7518 7524 7532 7878 7926 7946 8028 8328 8359 8416 8657 8914 9039 9052 9075 9144 9182 9190 9208 9388 9512 9606 9644 9855 9880 9949 9952 9989 10104 10106 10312 10348 10388 10433 10441 10472 10475 10516 10561 10587 10640 10666 10689 10690 10769 10823 10837 10881 10888 10905 10912 10961 10965 10970 10976 11006 11009 11031 11033 11090 11101 11115 11132 11137 11168 11177 11178 11180 11198 11234 11239 11246 11247 11269 11283 11302 11326 11341 11380 11382 11389 11403 11404 11428 11433 11434 11782 11825 11846 11907 11928 12383 17242 17260 17491 17558 17601 17748 17771 17858 17867 18002 18011 18013 18027 18098 18099 18198 18235 18388 18785 18792 18793 18858 19327 19417 19702 19754 19756 19828 19858 20002 20388 21877 21970 22828 22890 23078 23204 24696 25344 25594 25843 25851 25938 25947 25959 25979 25980 26010 26162 26178 26180 26205 26253 26256 26302 26342 26353 26362 26390 26392 26551 26555 26964 26971 26992 27047 27053 27079 27199 27243 27260 27332 27333 27337 27409 27431 27446 27457 27494 27513 27516 27575 27581 27604 27654 27657 27665 27668 27697 27732 27735 27765 27770 27772 27854 27855 27884 28077 28180 28335 28511 28585 28598 28631 28643 31316 31396 32440 36756 36766 36767 36775 36779 36785 36808 43754 49016 49101https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/662/15?format=asciiOpticaldefaultJ/ApJ/662/15/sample1HeBCD sample listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainr_Pos[as*] Reference for position (1)meta.ref;pos.framecharSNameSimbad namemeta.idcharNameNamemeta.id;meta.maincharprimarySimbadSimbad column added by the CDScharNEDSimbad column added by the CDScharJ/ApJ/662/15/sample2SDSS DR5 sample listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS name (mjd-plate-fiber) (G1)meta.id;meta.maincharprimaryRAJ2000? Right ascension in decimal degrees (J2000) (1)degpos.eq.ra;meta.mainnullableDEJ2000? Declination in decimal degrees (J2000) (1)degpos.eq.dec;meta.mainnullablez? Redshiftsrc.redshiftfloatnullableSDSSDisplay the SDSS data for this spectrummeta.ref.urlcharJ/ApJ/662/15/propProperties of HII regions: emission lines fluxes and equivalent widths, abundances and physical parameterse_YUncertainty in Ystat.error;pos.cartesian.yfloatNII-6583? The [NII] 6583 emission line flux (1)phot.fluxfloatnullableOII-7320? The [OII] 7320 emission line flux (1)phot.fluxfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identification (G1)meta.id;meta.maincharOII-3727? The [OII] 3727 emission line flux (1)phot.fluxfloatnullablee_OII-3727? Error in OII-3727stat.errorfloatnullableH12-3750? The H12 3750 emission line flux (1)phot.fluxfloatnullablee_H12-3750? Error in H12-3750stat.errorfloatnullableH11-3771? The H11 3771 emission line flux (1)phot.fluxfloatnullablee_H11-3771? Error in H11-3771stat.errorfloatnullableH10-3797? The H10 3797 emission line flux (1)phot.fluxfloatnullablee_H10-3797? Error in H10-3797stat.errorfloatnullableH9-3835? The H9 3835 emission line flux (1)phot.fluxfloatnullablee_H9-3835? Error in H9-3835stat.errorfloatnullableH8+HeIThe H8+HeI 3889 emission line flux (1)phot.fluxfloate_H8+HeIError in H8+HeIstat.errorfloatHd-4102The H{delta} 4102 emission line flux (1)phot.fluxfloate_Hd-4102Error in Hd-4102stat.errorfloatHg-4340The H{gamma} 4340 emission line flux (1)phot.fluxfloate_Hg-4340Error in Hg-4340stat.errorfloatOIII-4363The [OIII] 4363 emission line flux (1)phot.fluxfloate_OIII-4363Error in OIII-4363stat.errorfloatHeI-4471The HeI 4471 emission line flux (1)phot.fluxfloate_HeI-4471Error in HeI-4471stat.errorfloatHeII-4686? The HeII 4686 emission line flux (1)phot.fluxfloatnullablee_HeII-4686? Error in HeII-4686stat.errorfloatnullableHb-4861The H{beta} 4861 emission line flux (1)phot.fluxfloate_Hb-4861Error in Hb-4861stat.errorfloatOIII-4959The [OIII] 4959 emission line flux (1)phot.fluxfloate_OIII-4959Error in OIII-4959stat.errorfloatOIII-5007? The [OIII] 5007 emission line flux (1)phot.fluxfloatnullablee_OIII-5007? Error in OIII-5007stat.errorfloatnullableHeI-5876The HeI 5876 emission line flux (1)phot.fluxfloate_HeI-5876Error in HeI-5876stat.errorfloatHa-6563The H{alpha} 6563 emission line flux (1)phot.fluxfloate_Ha-6563Error in Ha-6563stat.errorfloate_NII-6583? Error in NII-6583stat.errorfloatnullableHeI-6678The HeI 6678 emission line flux (1)phot.fluxfloate_HeI-6678Error in HeI-6678stat.errorfloatSII-6717The [SII] 6717 emission line flux (1)phot.fluxfloate_SII-6717Error in SII-6717stat.errorfloatSII-6731The [SII] 6731 emission line flux (1)phot.fluxfloate_SII-6731Error in SII-6731stat.errorfloatHeI-7065The HeI 7065 emission line flux (1)phot.fluxfloate_HeI-7065Error in HeI-7065stat.errorfloate_OII-7320? Error in OII-7320stat.errorfloatnullableOII-7330? The [OII] 7330 emission line flux (1)phot.fluxfloatnullablee_OII-7330? Error in OII-7330stat.errorfloatnullableWOII-3727? The [OII] 3727 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WOII-3727? Error in OII-37270.1nmstat.errorfloatnullableWH12-3750? The H12 3750 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WH12-3750? Error in H12-37500.1nmstat.errorfloatnullableWH11-3771? The H11 3771 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WH11-3771? Error in H11-37710.1nmstat.errorfloatnullableWH10-3797? The H10 3797 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WH10-3797? Error in H10-37970.1nmstat.errorfloatnullableWH9-3835? The H9 3835 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WH9-3835? Error in H9-38350.1nmstat.errorfloatnullableWH8+HeIThe H8+HeI 3889 equivalent width (2)0.1nmspect.line.eqWidthfloate_WH8+HeIError in H8+HeI0.1nmstat.errorfloatWHd-4102The H{delta} 4102 equivalent width (2)0.1nmspect.line.eqWidth;em.line.Hdeltafloate_WHd-4102Error in Hd-41020.1nmstat.errorfloatWHg-4340The H{gamma} 4340 equivalent width (2)0.1nmspect.line.eqWidth;em.line.Hgammafloate_WHg-4340Error in Hg-43400.1nmstat.errorfloatWOIII-4363The [OIII] 4363 equivalent width (2)0.1nmspect.line.eqWidth;em.line.OIIIfloate_WOIII-4363Error in OIII-43630.1nmstat.errorfloatWHeI-4471The HeI 4471 equivalent width (2)0.1nmspect.line.eqWidthfloate_WHeI-4471Error in HeI-44710.1nmstat.errorfloatWHeII-4686? The HeII 4686 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WHeII-4686? Error in HeII-46860.1nmstat.errorfloatnullableWHb-4861The H{beta} 4861 equivalent width (2)0.1nmspect.line.eqWidth;em.line.Hbetafloate_WHb-4861Error in Hb-48610.1nmstat.errorfloatWOIII-4959The [OIII] 4959 equivalent width (2)0.1nmspect.line.eqWidth;em.line.OIIIfloate_WOIII-4959Error in OIII-49590.1nmstat.errorfloatWOIII-5007? The [OIII] 5007 equivalent width (2)0.1nmspect.line.eqWidth;em.line.OIIIfloatnullablee_WOIII-5007? Error in OIII-50070.1nmstat.errorfloatnullableWHeI-5876The HeI 5876 equivalent width (2)0.1nmspect.line.eqWidthfloate_WHeI-5876Error in HeI-58760.1nmstat.errorfloatWHa-6563The H{alpha} 6563 equivalent width (2)0.1nmspect.line.eqWidth;em.line.Halphafloate_WHa-6563Error in Ha-65630.1nmstat.errorfloatWNII-6583? The [NII] 6583 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WNII-6583? Error in NII-65830.1nmstat.errorfloatnullableWHeI-6678The HeI 6678 equivalent width (2)0.1nmspect.line.eqWidthfloate_WHeI-6678Error in HeI-66780.1nmstat.errorfloatWSII-6717The [SII] 6717 equivalent width (2)0.1nmspect.line.eqWidthfloate_WSII-6717Error in SII-67170.1nmstat.errorfloatWSII-6731The [SII] 6731 equivalent width (2)0.1nmspect.line.eqWidthfloate_WSII-6731Error in SII-67310.1nmstat.errorfloatWHeI-7065The HeI 7065 equivalent width (2)0.1nmspect.line.eqWidthfloate_WHeI-7065Error in HeI-70650.1nmstat.errorfloatWOII-7320? The [OII] 7320 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WOII-7320? Error in OII-73200.1nmstat.errorfloatnullableWOII-7330? The [OII] 7330 equivalent width (2)0.1nmspect.line.eqWidthfloatnullablee_WOII-7330? Error in OII-73300.1nmstat.errorfloatnullable(O/H)1The O/H abundance ratio (3)phys.abundfloate_(O/H)1Uncertainty in (O/H)1stat.errorfloat(O/H)2The O/H abundance ratio (4)phys.abundfloate_(O/H)2Uncertainty in (O/H)2stat.errorfloat(N/H)1The N/H abundance ratio (3)phys.abundfloate_(N/H)1Uncertainty in (N/H)1stat.errorfloat(N/H)2The N/H abundance ratio (4)phys.abundfloate_(N/H)2Uncertainty in (N/H)2stat.errorfloatYThe He mass fractionphys.abundfloatEWHbThe H{beta} equivalent width in Angstroms0.1nmspect.line.eqWidth;em.line.HbetaintTeOIIIElectron temperature in the O III regionKphys.temperature;phys.electronfloate_TeOIIIUncertainty in TeOIIIKstat.errorfloatTeHe+Electron temperature in the He+ regionKphys.temperature;phys.electronfloate_TeHe+Uncertainty in TeHe+Kstat.errorfloatNeElectron densitycm**-3phys.density;phys.electronintE_NeUpper limit uncertainty in Necm**-3stat.error;stat.maxinte_NeLower limit uncertainty in Necm**-3stat.errorinttauOptical depth at 3889 Angstromsphys.absorption.opticalDepthfloatE_tauUpper limit uncertainty in taustat.error;stat.maxfloate_tauLower limit uncertainty in taustat.errorfloatDHa/HaFraction of H{alpha} emission due to collisional excitationmeta.notefloatICFThe ionization correction factorarith.factorfloatchi2The {chi}^2^_min_ of the best solutionstat.fit.chi2double