J/MNRAS/477/2817ivo://CDS.VizieR/J/MNRAS/477/2817doi:10.26093/cds/vizier.74772817CDSSobral D.Matthee J.Darvish B.Smail I.Best P.N.Alegre L.,Rottgering H.Mobasher B.Paulino-Afonso A.Stroe A.Oteo I.2024-08-18T20:19:07Z2021-06-28T14:20:28ZCDS support team

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

cds-question@unistra.frgalaxiesultraviolet-astronomyredshiftedphotometryline-intensitiesDeep narrow-band surveys have revealed a large population of faint Ly{alpha} emitters (LAEs) in the distant Universe, but relatively little is known about the most luminous sources (L_Lya_>~10^42.7^erg/s; L_Lya>~L^*^_Lya_). Here we present the spectroscopic follow-up of 21 luminous LAEs at z~2-3 found with panoramic narrow-band surveys over five independent extragalactic fields (=~4x10^6^Mpc^3^ surveyed at z~2.2 and z~3.1). We use WHT/ISIS, Keck/DEIMOS, and VLT/X-SHOOTER to study these sources using high ionization UV lines. Luminous LAEs at z~2-3 have blue UV slopes ({beta}=-2.0^+0.3^_-0.1_) and high Ly{alpha} escape fractions (50^+20^_-15_ per cent) and span five orders of magnitude in UV luminosity (M_UV_=~-19 to -24). Many (70 per cent) show at least one high ionization rest-frame UV line such as CIV, NV, CIII], HeII or OIII], typically blue-shifted by =~100-200km/s relative to Ly{alpha}. Their Ly{alpha} profiles reveal a wide variety of shapes, including significant blue-shifted components and widths from 200 to 4000km/s. Overall, 60+/-11 per cent appear to be active galactic nucleus (AGN) dominated, and at L_Lya_>10^43.3^erg/s and/or M_UV_<-21.5 virtually all LAEs are AGNs with high ionization parameters (logU=0.6+/-0.5) and with metallicities of =~0.5-1Z_{sun}_. Those lacking signatures of AGNs (40+/-11 per cent) have lower ionization parameters (logU=-3.0^+1.6^_-0.9_ and log{xi}_ion_=25.4+/-0.2) and are apparently metal-poor sources likely powered by young, dust-poor 'maximal' starbursts. Our results show that luminous LAEs at z~2-3 are a diverse population and that 2xL^*^_Lya_ and 2*M_UV_^*^ mark a sharp transition in the nature of LAEs, from star formation dominated to AGN dominated.2018MNRAS.477.2817Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/477/2817CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/477/2817https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/477/2817http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/477/2817https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/477/2817https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/477/2817http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/477/2817GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/477/2817/table2 (Our spectroscopic luminous LAEs, ranked by redshift and then by Ly{alpha} luminosity of the parent sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/2817/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/2817/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/2817/table2?GETtext/xml+votable180.050000true217.618958333.55805560.0055555555555555566/9147 9150 10513 11252 17679 17690 19030 19034 19038 27256https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/477/2817?format=asciiUVdefaultJ/MNRAS/477/2817/table2Our spectroscopic luminous LAEs, ranked by redshift and then by Ly{alpha} luminosity of the parent sampleSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintspShow the spectrummeta.ref.urlcharIDName (ID_SMD_Paper_final)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainzspLya? Ly{alpha} spectroscopic redshift (z_spec_Lya)src.redshift;pos.heliocentricdoublenullableE_zspLya? Error on zspLya (upper value) (z_spec_Lya_up)stat.error;stat.maxdoublenullablee_zspLya? Error on zspLya (lower value) (z_spec_Lya_down)stat.errordoublenullableMUVAbsolute UV magnitude (AB) (MUV)magphys.magAbsdoubleE_MUVError on MUV (upper value) (MUV_err_up)magstat.error;stat.maxdoublee_MUVError on MUV (lower value) (MUV_err_down)magstat.errordoublebetaRest frame UV beta slope (f_lambda_{prop.to}lambda^beta^) (Beta)spect.indexdoubleE_betaError on beta (upper value) (Beta_err_up)stat.error;stat.maxdoublee_betaError on beta (lower value) (Beta_err_down)stat.errordoubleClassClassification (Table_flag)src.classcharNBAp2Narrow-band magnitude (NB_AP2)magphot.magfloate_NBAp2rms uncertainty on NBAP2 (NB_ERR_AP2)magstat.errordoubleBBAp2Broad-band magnitude (BB_AP2)magphot.magfloate_BBAp2rms uncertainty on BBAP2 (BB_ERR_AP2)magstat.errordoublelinefluxLine flux (lineflux)phot.fluxdoubleE_linefluxError on lineflux (upper value) (lineflux_err_up)stat.error;stat.maxdoublee_linefluxError on lineflux (lower value) (lineflux_err_down)stat.errordoubleEW0Equivalent width (EW_0)0.1nmspect.line.eqWidthdoubleE_EW0Error on EW0 (upper value) (EW_0_err_up)0.1nmstat.error;stat.maxdoublee_EW0Error on EW0 (lower value) (EW_0_err_down)0.1nmstat.errordoublelogLLyaLy{alpha} luminosity (Lya_lum)log(1e-07W)phys.luminosity;em.UVfloatE_logLLyaError on EW0 (upper value) (Lya_lum_err_up)log(1e-07W)stat.error;stat.maxdoublee_logLLyaError on EW0 (lower value) (Lya_lum_err_down)log(1e-07W)stat.errordoubleFWHMLya? Ly{alpha} FWHM (FWHM_Lya)km/sspect.line.widthdoublenullableE_FWHMLya? Error on FWHMLya (upper value) (FWHM_Lya_up)km/sstat.error;stat.maxdoublenullablee_FWHMLya? Error on FWHMLya (lower value) (FWHM_Lya_down)km/sstat.errordoublenullableFileNameName of the spectrum file in subdirectory spmeta.id;meta.filechar