J/MNRAS/472/772ivo://CDS.VizieR/J/MNRAS/472/772doi:10.26093/cds/vizier.74720772CDSMatthee J.Sobral D.Darvish B.Santos S.Mobasher B.,Paulino-afonso A.Rottgering H.Alegre L.2024-08-17T20:21:12Z2020-08-11T09:49:28ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyredshiftedline-intensitiesultraviolet-astronomyWe present spectroscopic follow-up of candidate luminous Ly{alpha} emitters (LAEs) at z=5.7-6.6 in the SA22 field with VLT/X-SHOOTER. We confirm two new luminous LAEs at z=5.676 (SR6) and z=6.532 (VR7), and also present HST follow-up of both sources. These sources have luminosities L_Ly {alpha}_~=3x10^43^erg/s, very high rest-frame equivalent widths of EW_0_>=200{AA} and narrow Ly{alpha} lines (200-340km/s). VR7 is the most UV-luminous LAE at z>6.5, with M_1500_=-22.5, even brighter in the UV than CR7. Besides Ly{alpha}, we do not detect any other rest-frame UV lines in the spectra of SR6 and VR7, and argue that rest-frame UV lines are easier to observe in bright galaxies with low Ly{alpha} equivalent widths. We confirm that Ly{alpha} line widths increase with Ly{alpha} luminosity at z=5.7, while there are indications that Ly{alpha} lines of faint LAEs become broader at z=6.6, potentially due to reionization. We find a large spread of up to 3 dex in UV luminosity for >L* LAEs, but find that the Ly{alpha} luminosity of the brightest LAEs is strongly related to UV luminosity at z=6.6. Under basic assumptions, we find that several LAEs at z~=6-7 have Ly{alpha} escape fractions >=100 per cent, indicating bursty star formation histories, alternative Ly{alpha} production mechanisms, or dust attenuating Ly{alpha} emission differently than UV emission. Finally, we present a method to compute {xi}_ion_, the production efficiency of ionizing photons, and find that LAEs at z~=6-7 have high values of log_10_({xi}_ion_/Hz/erg)~=25.51+/-0.09 that may alleviate the need for high Lyman-Continuum escape fractions required for reionization.2017MNRAS.472..772Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/472/772CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/498/13 : Lyman-{alpha} emitters from redshifts z~2-3 (Nilsson+, 2009)J/A+A/628/A3 : LAE z~3-7 luminosity functions (de La Vieuville+, 2019)J/ApJ/706/762 : LAEs at z~4.5 in the LALA Cetus field (Wang+, 2009)J/MNRAS/403/L54 : Ly{alpha} emitters (LAE) in A1689-7.1 (Matsuda+, 2010)J/ApJ/736/31 : HETDEX pilot survey. II. 1.9<z<3.8 LAEs (Blanc+, 2011)J/ApJ/738/136 : LAEs between 0.19<z<1.25 with GALEX grism (Cowie+, 2011)J/ApJ/743/9 : z=3.1 LAEs morphological properties (Gronwall+, 2011)J/ApJ/744/110 : LAE galaxies between 2.1=<z<=3.1 (Ciardullo+, 2012)J/ApJ/751/29 : Ly{alpha} profiles of LAEs at z=3.1 (Yamada+, 2012)J/ApJ/753/95 : LAE galaxies in the ECDF-S at z~2.1 and z~3.1 (Bond+, 2012)J/ApJ/765/47 : Lyman-break galaxies and LAEs at z~3 (Nestor+, 2013)J/ApJ/779/65 : Photometry of LBGs, LAEs & GNBs at z~2.85 (Mostardi+, 2013)J/ApJ/810/107 : Lyman break galaxies & LAEs HST photometry (Mostardi+, 2015)J/ApJ/813/78 : Spitzer z=4.5 & z=5.7 LAEs properties (Finkelstein+, 2015)J/ApJ/845/172 : LAE candidates around bright Ly{alpha} blobs (Badescu+ 2017)J/MNRAS/465/316 : Lyman continuum LAEs and LBGs in SSA22 field (Micheva+ 2017(J/MNRAS/468/1123 : LAE among star-forming galaxies at z=2.5 (Shimakawa+, 2017)J/ApJ/863/92 : LAE cand. at z~5.7 in QSO J0148+0600 field (Becker+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/472/772https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/472/772http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/472/772https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/472/772https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/472/772http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/472/772GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/472/772/tableb1 (Candidate LAEs at z=5.7 from Santos et al. (2016MNRAS.463.1678S))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/772/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/772/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/772/tableb1?GETtext/xml+votable180.050000true334.95733750.806637780.005555555555555556Cone search capability for table J/MNRAS/472/772/tableb2 (Candidate LAEs at z=6.6 from Matthee et al. (2015MNRAS.451..400M))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/772/tableb2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/772/tableb2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/772/tableb2?GETtext/xml+votable180.050000true334.734816670.135367780.0055555555555555565/4759 6814 6/17677 17679 17688 17690 19030 19033-19035 19056-19057 19060 27245 27247 27344https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/472/772?format=asciiUVdefaultJ/MNRAS/472/772/tableb1Candidate LAEs at z=5.7 from Santos et al. (2016MNRAS.463.1678S)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName, ID_NB_1meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainFNB816NB816 line flux1e-20W.m**-2phot.flux;spect.linefloatLLyaLyman{alpha} luminosityphys.luminosity;em.UVfloatEW0Equivalent width0.1nmspect.line.eqWidthintl_EW0[0/1] Limit flag on EW0meta.code.errorcharBibCodeReference bibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharJ/MNRAS/472/772/tableb2Candidate LAEs at z=6.6 from Matthee et al. (2015MNRAS.451..400M)l_EW0[0/1] Limt flag on EW0meta.code.errorcharBibCodeReference bibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainFNB921NB921 line flux1e-20W.m**-2phot.flux;spect.linefloatLLyaLy{alpha} luminosityphys.luminosity;em.UVfloatEW0Equivalent width0.1nmspect.line.eqWidthint