J/ApJ/869/123ivo://CDS.VizieR/J/ApJ/869/123doi:10.26093/cds/vizier.18690123CDSSteidel C.C.Bogosavljevic M.Shapley A.E.Reddy N.A.Rudie G.C.,Pettini M.Trainor R.F.Strom A.L.2021-03-01T10:50:48Z2019-12-30T11:56:21ZCDS support team

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

cds-question@unistra.frsurveysgalaxiesspectroscopyredshiftedtwo-color-diagramsultraviolet-astronomyvisible-astronomysloan-photometryline-intensitiesintergalactic-mediumWe present results of a deep spectroscopic survey quantifying the statistics of the escape of ionizing radiation from star-forming galaxies at z~3. We measure the ratio of ionizing to non-ionizing UV flux density <f_900_/f_1500_>_obs_, where f_900_ is the mean flux density evaluated over the range [880,910]{AA}. We quantify the emergent ratio of ionizing to non-ionizing UV flux density by analyzing high signal-to-noise ratio composite spectra formed from subsamples with common observed properties and numbers sufficient to reduce the statistical uncertainty in the modeled IGM+CGM correction to obtain precise values of <f_900_/f_1500_>_out_, including a full-sample average <f_900_/f_1500>_out_=0.057{+/-}0.006. We show that <f_900_/f_1500_>_out_ increases monotonically with W_{lambda}_(Ly{alpha}), inducing an inverse correlation with UV luminosity as a by-product. We fit the composite spectra using stellar spectral synthesis together with models of the ISM in which a fraction f_c_ of the stellar continuum is covered by gas with column density N_HI_. We show that the composite spectra simultaneously constrain the intrinsic properties of the stars (L_900_/L_1500_)_int_ along with f_c_, N_HI_, E(B-V), and f_esc,abs_, the absolute escape fraction of ionizing photons. We find a sample-averaged f_esc,abs_=0.09{+/-}0.01, with subsamples falling along a linear relation <f_esc,abs_>~0.75[W_{lambda}_(Ly{alpha})/110{AA}]. Using the far-UV luminosity function, the distribution function n(W(Ly{alpha})), and the relationship between W_{lambda}_(Ly{alpha}) and <f_900_/f_1500_>_out_, we estimate the total ionizing emissivity of z~3 star-forming galaxies with M_uv_<=-19.5, which exceeds the contribution of quasi-stellar objects by a factor of ~3, and accounts for ~50% of the total {epsilon}LyC at z~3 estimated using indirect methods.2018ApJ...869..123Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/869/123CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/116 : Spectrophotometric Standards (Massey+ 1988)J/ApJ/592/728 : Lyman break galaxies at redshift z~3 (Steidel+, 2003)J/ApJ/667/79 : Ly{alpha} emission-line galaxies at z=3.1 (Gronwall+, 2007)J/ApJ/671/1227 : Ly{alpha} galaxies at z~4.5 (Dawson+, 2007)J/A+A/498/13 : Lyman-{alpha} emitters from redshifts z~2-3 (Nilsson+, 2009)J/ApJ/725/394 : High-redshift Ly{alpha} emitters (Hu+, 2010)J/ApJ/736/18 : Lyman-continuum emission at z~3 in SSA22 field (Nestor+,2011)J/ApJ/779/65 : Photometry of LBGs, LAEs and GNBs at z~2.85 (Mostardi+, 2013)J/ApJ/765/47 : Lyman-break galaxies and LAEs at z~3 (Nestor+, 2013)J/ApJ/795/165 : Line ratios in z~2-3 galaxies KBSS-MOSFIRE (Steidel+,2014)J/ApJ/803/34 : z~4-10 galaxies from HST legacy fields (Bouwens+, 2015)J/ApJ/810/71 : UV mag of candidate galaxies at 3~<z~<8.5 (Finkelstein+,2015)J/ApJ/810/107 : Lyman break galaxies and LAEs HST photometry (Mostardi+,2015)J/ApJS/221/2 : Keck+Magellan survey for LLSs. III. (Prochaska+, 2015)J/ApJ/828/21 : ZFIRE v1.0 data release (Nanayakkara+, 2016)J/MNRAS/465/302 : Lyman continuum leaking AGN in SSA22 field (Micheva+, 2017)J/MNRAS/465/316 : Lyman continuum LAEs and LBGs in SSA22 field (Micheva+, 2017)J/A+A/611/A95 : Diffuse ionized gas in the Antennae galaxy (Weilbacher+,2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/869/123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/869/123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/869/123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/869/123https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/869/123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/869/123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/869/123/table2 (The final Keck Lyman Continuum Spectroscopic (KLCS) sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/869/123/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/869/123/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/869/123/table2?GETtext/xml+votable180.050000true15.83887513.26341110.0055555555555555566/0 4947 5063 5272 5274 8552 8553 8912 8914 11424 17749 18366 19397https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/869/123?format=asciiUVOpticaldefaultJ/ApJ/869/123/table2The final Keck Lyman Continuum Spectroscopic (KLCS) sampleSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSAS-LBGField+Slit based object namemeta.id;meta.maincharprimaryn_SAS-LBGFlag on SAS-LBG (1)meta.notecharRAJ2000[1/22] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[0/52] Degree of Declination (J2000)pos.eq.dec;meta.mainzsys[2.7/3.6] Galaxy systemic redshiftsrc.redshift;pos.heliocentricfloatRmag[23.2/26] {R}-band AB magnitudemagphot.mag;em.opt.Rfloat(G-R)[0.04/1.2] G-{R} color, AB magnitude(s)magphot.color;em.opt.B;em.opt.Rfloat(Un-G)[1.25/3.79] U_n_-G color, AB magnitude(s)magphot.color;em.opt;em.optfloat(G-R)0[-0.05/1.1] Corrected G-{R} color index (2)magphot.color;em.opt.B;em.opt.RfloatEWLya[-34.8/153.4] Rest-frame equivalent width, Ly{alpha}, in Angstrom units (3)0.1nmspect.line.eqWidthfloatF900[-0.04/0.2] UV flux density at 900{AA}uJyphot.flux;em.UVfloate_F900[0.005/0.03] Uncertainty in F900uJystat.errorfloatF1500[0.1/1.6] UV flux density at 900{AA}uJyphot.flux;em.UVfloate_F1500[0.008/0.03] Uncertainty in F1500uJystat.errorfloatF900/F1500[-0.09/0.6] Observed F900/F1500 flux density ratiophot.flux;arith.ratiofloate_F900/F1500[0.006/0.2] Propagated uncertainty in F900/F1500stat.errorfloatLyCDisplay the Lyman continuum (LyC) detection data for this galaxy (link to Table 3)meta.ref.urlcharpPDisplay data from Steidel+, 2003, J/ApJ/592/728 and Mostardi+, 2013, J/ApJ/779/65 within 3.2"meta.ref.urlintnullableJ/ApJ/869/123/table3Objects with individual Lyman continuum (LyC) detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSAS-LBGField+Slit based object namemeta.id;meta.maincharf_SAS-LBGObject flag(s) (1)meta.codecharzsys[2.8/3.5] Galaxy systemic redshiftsrc.redshift;pos.heliocentricfloatLyC[0.3/1.5] UV luminosity, in units of L*_uv_ at z=3 (2)phys.luminosity;em.UVfloatF900/F1500[0.05/0.6] Observed F900/F1500 flux density ratiophot.flux;arith.ratiofloate_F900/F1500[0.01/0.1] Propagated uncertainty in F900/F1500 (includes systematic error)stat.errorfloat