J/ApJ/844/171ivo://CDS.VizieR/J/ApJ/844/171doi:10.26093/cds/vizier.18440171CDSYang H.Malhotra S.Gronke M.Rhoads J.E.Leitherer C.Wofford A.,Jiang T.Dijkstra M.Tilvi V.Wang J.2018-05-16T07:07:01Z2018-04-12T17:27:26ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyredshiftedextinctionvisible-astronomyultraviolet-astronomyline-intensitiesWe studied Lyman-{alpha} (Ly{alpha}) escape in a statistical sample of 43 Green Peas with HST/COS Ly{alpha} spectra. Green Peas are nearby star-forming galaxies with strong [OIII]{lambda}5007 emission lines. Our sample is four times larger than the previous sample and covers a much more complete range of Green Pea properties. We found that about two-thirds of Green Peas are strong Ly{alpha} line emitters with rest-frame Ly{alpha} equivalent width >20{AA}. The Ly{alpha} profiles of Green Peas are diverse. The Ly{alpha} escape fraction, defined as the ratio of observed Ly{alpha} flux to intrinsic Ly{alpha} flux, shows anti-correlations with a few Ly{alpha} kinematic features-both the blue peak and red peak velocities, the peak separations, and the FWHM of the red portion of the Ly{alpha} profile. Using properties measured from Sloan Digital Sky Survey optical spectra, we found many correlations-the Ly{alpha} escape fraction generally increases at lower dust reddening, lower metallicity, lower stellar mass, and higher [OIII]/[OII] ratio. We fit their Ly{alpha} profiles with the HI shell radiative transfer model and found that the Ly{alpha} escape fraction is anti-correlated with the best-fit N_HI_. Finally, we fit an empirical linear relation to predict f_esc_^Ly{alpha}^ from the dust extinction and Ly{alpha} red peak velocity. The standard deviation of this relation is about 0.3dex. This relation can be used to isolate the effect of intergalactic medium (IGM) scatterings from Ly{alpha} escape and to probe the IGM optical depth along the line of sight of each z>7 Ly{alpha} emission-line galaxy in the James Webb Space Telescope era.2017ApJ...844..171Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/844/171CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/ApJ/642/L13 : ECDFS MUSYC galaxies UBVRIzNB5000 photometry (Gawiser+, 2006)J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)J/ApJ/680/1072 : Ly{alpha}-emitting galaxies at 0.2<z<0.35 (Deharveng+, 2008)J/ApJ/706/762 : LAEs at z~4.5 in the LALA Cetus field (Wang+, 2009)J/ApJ/711/928 : Low-redshift Ly{alpha} galaxies from GALEX (Cowie+, 2010)J/ApJ/738/136 : LAEs between 0.19<z<1.25 with GALEX grism (Cowie+, 2011)J/A+A/531/A12 : Grid of Lya radiation transfer models (Schaerer+, 2011)J/A+A/561/A89 : Optical spectroscopy of 24 Ly-alpha emitters (Atek+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/844/171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/844/171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/844/171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/844/171https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/844/171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/844/171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/844/171/greenpeas (Green Pea galaxies line measurements from SDSS spectra and Ly{alpha} properties from HST/COS (tables 1-3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/844/171/greenpeas?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/844/171/greenpeas?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/844/171/greenpeas?GETtext/xml+votable180.050000true203.266416762.76769440.0055555555555555566/4394 4487 4515 4739 4806 4807 4984 5174 5263 5351 5715 5814 5950 6130 6164 6270 7259 7505 8328 8778 8969 9201 9743 9866 10601 10621 11275 11832 18019 18098 19410 22358 23048 25927 26313 26588 27911 28034 28468 28607 28641 31649 36801https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/844/171?format=asciiOpticalUVdefaultJ/ApJ/844/171/table4Ly{alpha} profile model parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name (HHMM+DDMM; J2000)meta.id;meta.maincharlogNHI[16/21] HI column density of the outflowing HI shelllog(cm**-2)phys.columnDensityfloate_logNHI[0.07/2] Negative uncertainty on logNHIlog(cm**-2)stat.errorfloatE_logNHI[0.07/1.6] Positive uncertainty on logNHIlog(cm**-2)stat.error;stat.maxfloatVexp[-171/270] Outflowing velocity of the HI shellkm/sphys.veloc.expansioninte_Vexp[1/26] Negative uncertainty on Vexpkm/sstat.errorintE_Vexp[1/44] Positive uncertainty on Vexpkm/sstat.error;stat.maxintlogT[3/5.7] Log of HI gas temperature (1)log(K)spect.line.intensity;em.line.HI;spect.linefloate_logT[0.1/1.3] Negative uncertainty on logTlog(K)stat.errorfloatE_logT[0.1/0.6] Positive uncertainty on logTlog(K)stat.error;stat.maxfloattau[0/4.9] Dust optical depthphys.absorption.opticalDepthfloate_tau[0/0.4] Negative uncertainty on taustat.errorfloatE_tau[0/1.2] Positive uncertainty on taustat.error;stat.maxfloatsigma[64/427] 1{sigma} width of the Gaussian profile of the intrinsic Ly{alpha} linekm/sspect.line.widthinte_sigma[2/29] Negative uncertainty on sigmakm/sstat.errorintE_sigma[2/31] Positive uncertainty on sigmakm/sstat.error;stat.maxintJ/ApJ/844/171/greenpeasGreen Pea galaxies line measurements from SDSS spectra and Ly{alpha} properties from HST/COS (tables 1-3)SimbadNameSimbad column added by the CDSmeta.idcharNotesNote(s) on Ly{alpha} (2)meta.notecharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name (HHMM+DDMM; J2000)meta.id;meta.maincharprimaryFitDisplay the best-fit parameters for this galaxy (table 4)meta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainzsp[0.09/0.4] Redshift, from SDSS optical spectrasrc.redshiftdoubleE(B-V)MW[0.007/0.09] Milky Way extinction, Schlafly & Finkbeiner (2011ApJ...737..103S)magphot.color.excessfloatE(B-V)[0/0.5] Dust extinctionmagphot.color.excessfloat12+log(O/H)[7.7/8.4] Gas metallicity, 12+log(O/H)phys.abundfloatlogM[7.8/10] Stellar masslog(solMass)phys.massfloatSFR[1.3/62.4] Star formation rate, from H{alpha} luminositysolMass/yrphys.SFRfloatRe[0.3/1.5] Half light radiuskpcphysfloatPIDHST/COS program identifiermeta.id;obsint[OII]3727[73/5172] Flux, [OII]37271e-20W.m**-2phot.fluxinte_[OII]3727[3/29] Error, [OII]37271e-20W.m**-2stat.errorint[OIII]4363[4/153] Flux, [OIII]43631e-20W.m**-2phot.fluxfloate_[OIII]4363[0.8/7] Error, [OIII]43631e-20W.m**-2stat.errorfloatHbeta[58/2909] Flux, Hbeta1e-20W.m**-2phot.fluxinte_Hbeta[2/15] Error, Hbeta1e-20W.m**-2stat.errorint[OIII]4959[123/4275] Flux, [OIII]49591e-20W.m**-2phot.fluxinte_[OIII]4959[1/15] Error, [OIII]49591e-20W.m**-2stat.errorint[OIII]5007[371/12949] Flux, [OIII]50071e-20W.m**-2phot.fluxinte_[OIII]5007[4/46] Error, [OIII]50071e-20W.m**-2stat.errorintHalpha[78/8855] Flux, Halpha1e-20W.m**-2phot.fluxinte_Halpha[4/57] Error, Halpha1e-20W.m**-2stat.errorintEW(Ha)[232/921] Restframe equivalent width, Halpha0.1nmspect.line.eqWidthint[OIII]/[OII][1.5/14.2] Extinction corrected [OIII]/[OII] ratio (1)phot.flux;arith.ratiofloatFlux(LyA)[-1.4/1524]? Flux, Lyman-alpha1e-19W.m**-2phot.fluxfloatnullablee_Flux(LyA)[0.6/10]? Error, LyA flux1e-19W.m**-2stat.errorfloatnullablelogL(LyA)[41/43.2]? log luminosity, LyA, in erg/s unitlog(1e-07W)phys.luminosity;em.UVfloatnullableEW(LyA)[3/165]? rest-frame equivalent width of LyA0.1nmspect.line.eqWidthfloatnullablefesc(LyA)[0.005/1.2]? LyA escape fractionstat.fit.paramfloatnullableV(blue-pk)[-427/-56]? Velocity of LyA blue-peakkm/sspect.dopplerVelocintnullablee_V(blue-pk)[13/88]? Error, V(blue-pk)km/sstat.errorintnullableV(red-pk)[67/568]? Velocity of LyA red-peakkm/sspect.dopplerVelocintnullablee_V(red-pk)[10/94]? Error, V(red-pk)km/sstat.errorintnullableFWHM(red)[160/435]? FWHM of the red portion of LyA profilekm/sspect.line.widthintnullablee_FWHM(red)[15/150]? Error, FWHM(red)km/sstat.errorintnullableSDSSDisplay the SDSS -DR7 (II/294) and -DR12 (V/147) data within 1"meta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlchar