The Clowes-Campusano LQG Survey. I.

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.