J/ApJ/702/506ivo://CDS.VizieR/J/ApJ/702/506CDSHaberzettl L.Williger G.M.Lauroesch J.T.Haines C.P.Valls-Gabaud D.,Harris K.A.Koekemoer A.M.Loveday J.Campusano L.E.Clowes R.G.,Dave R.Graham M.J.Sochting I.K.CDS support team

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

cds-question@unistra.frgalaxiesvisible-astronomyredshiftedsurveysultraviolet-astronomysloan-photometryThe nature of galaxy structures on large scales is a key observational prediction for current models of galaxy formation. The Sloan Digital Sky Survey (SDSS) and the 2dF galaxy survey have revealed a number of structures on 40-150h^-1^Mpc scales at low redshifts, and some even larger ones. To constrain galaxy number densities, luminosities, and stellar populations in large structures at higher redshift, we have investigated two sheet-like structures of galaxies at z=0.8 and 1.3 spanning 150h^-1^ comoving Mpc embedded in large quasar groups (LQGs) extending over at least 200h^-1^Mpc. We present first results of an analysis of these sheet-like structures using two contiguous 1{deg} Galaxy Evolution Explorer (GALEX) fields (FUV and NUV) cross-correlated with optical data from the SDSS. We derive a sample of 462 Lyman break galaxy (LBG) candidates coincident with the sheets. Using the GALEX and SDSS data, we show that the overall average spectral energy distribution of a LBG galaxy at z~1 is flat (in f_{lambda}_) in the rest-frame wavelength range from 1500{AA} to 4000{AA}, implying evolved populations of stars in the LBGs. From the luminosity functions we get indications for overdensities in the two LQGs compared to their foreground regions.2009ApJ...702..506Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/702/506CatalogResearchIsServedByTAP VizieR generic servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)J/A+A/533/A142 : UV-to-IR fluxes of Hickson compact groups (Bitsakis+, 2011)J/MNRAS/403/683 : GALEX Arecibo SDSS survey (GASS) (Catinella+, 2010)J/ApJ/697/1410 : Lyman break galaxies at z~1.8-2.8 (Ly+, 2009)J/MNRAS/392/19 : The 2dF-SDSS QSO survey (Croom+, 2009)J/MNRAS/380/986 : Lyman-break galaxies from GALEX (Burgarella+, 2007)J/AJ/133/1780 : GALEX/SDSS quasar catalog (Trammell+, 2007)J/MNRAS/249/218 : Group of quasars (Clowes+, 1991)http://www.sdss.org/ : SDSS web sitehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/702/506https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/702/506http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/702/506https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/702/506https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/702/506http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/702/506GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVOpticaldefault