NOAO >   Observing Info >   Approved Programs >   2007A-0526

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Proposal Information for 2007A-0526


PI: Lutz Haberzettl, U. Louisville, lghabe01@louisville.edu
Address: Dept. of Physics & Astronomy, 102 Natural Sciences Bldg. University of Louisville, Louisville, KY 40292, USA

CoI: Gerard Williger, University of Louisville
CoI: James T. Lauroesch, University of Louisville
CoI: Olga Kuhn, Steward Observatory
CoI: Matthew Graham, Caltech

Title: Probing large-scale galaxy sheets at z=0.8

Abstract: Galaxy structures on large scales are one of the main pillars for the current models of galaxy formation. The SDSS and 2dF galaxy surveys have revealed a number of structures on 30-50 Mpc scales, and some even bigger structures. What is the nature of such large structures at higher redshift? To address this question, we have discovered and investigated two sheet-like structures of galaxies at z=0.8 and 1.2 toward a large quasar group (LQG), over 30^\prime, spanning at least 30 Mpc (comoving, (Lambda)CDM, h=0.7). Full spectroscopic redshift surveys over large areas in this z range are prohibitive. Instead, we propose to trace and probe these sheets to even larger scales (150 Mpc) with two contiguous 1 deg^2 fields observed in J and K using FLAMINGOS on the KPNO 2.1 m telescope, which we have just imaged with GALEX in the NUV and FUV bands. By combining the FLAMINGOS images proposed here with our GALEX data, we will be able to measure the photometric redshifts of the filaments at z=0.8 with high precision. This method constitutes the most efficient way to trace filaments at z~1, and hence to constrain both hierarchical formation theory and galaxy-quasar relations at that epoch.


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