J/ApJ/863/92ivo://CDS.VizieR/J/ApJ/863/92doi:10.26093/cds/vizier.18630092CDSBecker G.D.Davies F.B.Furlanetto S.R.Malkan M.A.Boera E.,Douglass C.2021-01-25T12:36:47Z2019-09-16T13:18:55ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryintergalactic-mediumvisible-astronomyThe observed scatter in intergalactic Ly{alpha} opacity at z<~6 requires large-scale fluctuations in the neutral fraction of the intergalactic medium (IGM) after the expected end of reionization. Post-reionization models that explain this scatter invoke fluctuations in either the ionizing ultraviolet background (UVB) or IGM temperature. These models make very different predictions, however, for the relationship between Ly{alpha} opacity and local density. Here, we test these models using Ly{alpha}-emitting galaxies (LAEs) to trace the density field surrounding the longest and most opaque known Ly{alpha} trough at z<6. Using deep Subaru Hyper Suprime-Cam narrowband imaging, we find a highly significant deficit of z~5.7 LAEs within 20h^-1^Mpc of the trough. The results are consistent with a model in which the scatter in Ly{alpha} opacity near z~6 is driven by large-scale UVB fluctuations, and disfavor a scenario in which the scatter is primarily driven by variations in IGM temperature. UVB fluctuations at this epoch present a boundary condition for reionization models, and may help shed light on the nature of the ionizing sources.2018ApJ...863...92Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/863/92CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/176/301 : Subaru/XMM-Newton deep survey IV. (SXDS) (Ouchi+, 2008)J/ApJ/793/115 : UV-continuum slopes beta for z~4-8 galaxies (Bouwens+, 2014)J/MNRAS/442/946 : z~5.7 C IV absorption systems (Diaz+, 2014)J/MNRAS/445/1745 : Giant Gemini GMOS survey. I. (Worseck+, 2014)J/ApJ/803/34 : z~4-10 galaxies from HST legacy fields (Bouwens+, 2015)J/MNRAS/449/4204 : WFC3/UVIS quasar-stacked spectrum at z=~2.4 (Lusso+, 2015)J/AJ/155/131 : z~5 QSO luminosity function from the CFHTLS (McGreer+, 2018)J/PASJ/70/S10 : GOLDRUSH I. UV magnitudes (Ono+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/863/92https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/863/92http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/863/92https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/863/92https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/863/92http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/863/92GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/863/92/table2 (Properties of Ly{alpha}-emitting galaxy (LAE) candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/863/92/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/863/92/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/863/92/table2?GETtext/xml+votable180.050000true26.46438755.981594440.0055555555555555566/18197 18199 18205 18240 18242 18243 18248 18249https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/863/92?format=asciiOpticaldefaultJ/ApJ/863/92/table2Properties of Ly{alpha}-emitting galaxy (LAE) candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDLAE identifier (JHHMMSS+DDMMSS); <[BDF2018] JHHMMSS+DDMMSS> in Simbadmeta.id;meta.maincharRAJ2000[1] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[5/6] Degree of Declination (J2000)pos.eq.dec;meta.mainNB816[21.7/26] NB816 magnitude, AB mag (1)magphot.mag;em.opt.IfloatFr2[-0.2/0.5] r2 flux, erg/s/cm2/{AA}cW.m**-2.nm**-1phot.fluxfloate_Fr2[0.006/0.04] r2 flux errorcW.m**-2.nm**-1stat.errorfloatFi2[-0.06/1.1] i2 flux, erg/s/cm2/{AA}cW.m**-2.nm**-1phot.fluxfloate_Fi2[0.01/0.05] i2 flux errorcW.m**-2.nm**-1stat.errorfloatFNB816[0.1/7.2] NB816 flux, erg/s/cm2/{AA} (1)cW.m**-2.nm**-1phot.fluxfloate_FNB816[0.01/0.1] NB816 flux errorcW.m**-2.nm**-1stat.errorfloatlogLya[42.4/44.2] log Ly{alpha} luminosity, in erg/s units (2)log(1e-07W)phys.luminosity;em.UVfloatE_logLya[0.002/0.1] log Ly{alpha} luminosity, upper errorlog(1e-07W)stat.error;stat.maxfloate_logLya[0.002/0.08] log Ly{alpha} luminosity, lower errorlog(1e-07W)stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar