J/ApJ/908/154ivo://CDS.VizieR/J/ApJ/908/154doi:10.26093/cds/vizier.19080154CDSRigby J.R.Florian M.Acharyya A.Bayliss M.Gladders M.D.Sharon K.,Brammer G.Momcheva I.LaMassa S.Bian F.Dahle H.Johnson T.,Kewley L.Murray K.Whitaker K.Wuyts E.2026-07-02T11:58:11Z2024-03-11T08:44:20ZCDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyspectroscopyultraviolet-astronomyinfrared-astronomygravitational-lensingFor the extremely bright lensed galaxy SDSSJ1723+3411 at z=1.3293, we analyze spatially integrated MMT, Keck, and Hubble Space Telescope spectra that fully cover the rest-frame wavelength range of 1400-7200{AA}. We also analyze near-IR spectra from Gemini that cover H{alpha} for a portion of the lensed arc. We report fluxes for 42 detected emission lines, and upper limits for an additional 22. This galaxy has extreme emission-line ratios and high equivalent widths that are characteristic of extreme emission-line galaxies. We compute strong emission-line diagnostics from both the rest-frame optical and rest-frame ultraviolet (UV), to constrain physical conditions and test the spectral diagnostics themselves. We tightly determine the nebular physical conditions using the most reliable diagnostics, and then compare to results from other diagnostics. We find disappointing performance from the UV-only diagnostics: they either are unable to measure the metallicity or dramatically underestimate it; they overestimate the pressure; and the UV diagnostic of ionization parameter has a strong metallicity dependence in this regime. Based on these results, we suggest that upcoming James Webb Space Telescope (JWST) spectroscopic surveys of galaxies in the reionization epoch should invest the additional integration time to capture the optical [OII] and [OIII] emission lines, and not rely solely on the rest-frame UV emission lines. We make available the spectra; they represent one of the highest-quality emission-line spectral atlases of star-forming galaxies available beyond the local universe, and will aid the planning of observations with JWST.2021ApJ...908..154Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/908/154CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)J/ApJ/795/165 : Line ratios in z~2-3 galaxies KBSS-MOSFIRE (Steidel+, 2014)J/ApJ/814/L6 : CIII emission in near & far star-forming galax (Rigby+, 2015)J/ApJ/822/42 : z~3.3 star-forming galaxies NIR spectra (Onodera+, 2016)J/ApJ/817/118 : SFR-M_*_ relation from ZFOURGE (Tomczak+, 2016)J/AJ/155/104 : MEGaSaURA. I. The sample and the spectra (Rigby+, 2018)J/A+A/641/A118 : Mean rest-UV spectra of Lya emitters at z>3 (Feltre+, 2020)J/ApJS/247/12 : Strong lens models for 37 clusters from SGAS (Sharon+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/908/154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/908/154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/908/154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/908/154https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/908/154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/908/154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticalInfrareddefaultJ/ApJ/908/154/fig7keck*Keck/ESI spectrum of SGAS 1723recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3000.8/16233] Wavelength (vacuum) in Angstroms0.1nmem.wldoubleFlux? Flux (f-lambda) in erg/s/cm2/{AA} (1)cW.m**-2.nm**-1phot.fluxdoublenullablee_Flux? Flux uncertaintycW.m**-2.nm**-1stat.error;phot.fluxdoublenullableCFlux? Flux continuum fit (not for composite spectrum)cW.m**-2.nm**-1phot.flux;spect.continuumdoublenullableJ/ApJ/908/154/fig7mmt*MMT Blue Channel spectrum of SGAS J1723recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3000.8/16233] Wavelength (vacuum) in Angstroms0.1nmem.wldoubleFlux? Flux (f-lambda) in erg/s/cm2/{AA} (1)cW.m**-2.nm**-1phot.fluxdoublenullablee_Flux? Flux uncertaintycW.m**-2.nm**-1stat.error;phot.fluxdoublenullableCFlux? Flux continuum fit (not for composite spectrum)cW.m**-2.nm**-1phot.flux;spect.continuumdoublenullableJ/ApJ/908/154/fig7g102*HST/WFC-3 G102 grism spectrum of S1723, from both roll anglesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[7475/17613] Wavelength (vacuum) in Angstroms0.1nmem.wlfloatFlux? Flux (f-lambda) in erg/s/cm2/{AA}cW.m**-2.nm**-1phot.fluxdoublenullablee_Flux? Flux uncertaintycW.m**-2.nm**-1stat.error;phot.fluxdoublenullableCFluxFlux continuum fitcW.m**-2.nm**-1phot.flux;spect.continuumdoubleFlux-cFlux minus continuum fitcW.m**-2.nm**-1phot.flux;spect.continuum;arith.diffdoubleJ/ApJ/908/154/fig7g141*HST/WFC-3 G141 grism spectrum of S1723, from both roll anglesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[7475/17613] Wavelength (vacuum) in Angstroms0.1nmem.wlfloatFlux? Flux (f-lambda) in erg/s/cm2/{AA}cW.m**-2.nm**-1phot.fluxdoublenullablee_Flux? Flux uncertaintycW.m**-2.nm**-1stat.error;phot.fluxdoublenullableCFluxFlux continuum fitcW.m**-2.nm**-1phot.flux;spect.continuumdoubleFlux-cFlux minus continuum fitcW.m**-2.nm**-1phot.flux;spect.continuum;arith.diffdoubleJ/ApJ/908/154/fig7comp*Composite convenience spectrum for SDSS J1723+3411 (comprised of portions of the MMT, ESI, and WFC3 spectra)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3000.8/16233] Wavelength (vacuum) in Angstroms0.1nmem.wldoubleFlux? Flux (f-lambda) in erg/s/cm2/{AA} (1)cW.m**-2.nm**-1phot.fluxdoublenullablee_Flux? Flux uncertaintycW.m**-2.nm**-1stat.error;phot.fluxdoublenullableJ/ApJ/908/154/fig8Combined high-resolution GNIRS spectra for S1723recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[15000.85/15499.83] Wavelength (vacuum) barycentric-corrected in Angstroms0.1nmem.wldoubleFlux[-4.1e-17/4.9e-16] Flux (f-lambda) in erg/s/cm2/{AA} (1)cW.m**-2.nm**-1phot.fluxdoublee_Flux[3.9e-18/1.1e-16] Flux uncertaintycW.m**-2.nm**-1stat.error;phot.fluxdouble