THE CLOWES-CAMPUSANO LARGE QUASAR GROUP SURVEY. I. GALEX SELECTED SAMPLE OF LYMAN BREAK GALAXIES AT z {approx} 1

Journal Article · Tue Sep 01 04:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/702/1/506; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21333810

Haberzettl, L; Williger, G M; Lauroesch, J T ^[1]; Haines, C P ^[2]; Valls-Gabaud, D ^[3]; Harris, K A; Clowes, R G ^[4]; Koekemoer, A M ^[5]; Loveday, J ^[6]; Campusano, L E ^[7]; Dave, R ^[8]; Graham, M J ^[9]

---

1. Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292 (United States)
2. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT (United Kingdom)
3. GEPI, CNRS UMR 8111, Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon Cedex (France)
4. Institute for Astrophysics, University of Central Lancashire, Preston PR1 2HE (United Kingdom)
5. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
6. Astronomy Centre, University of Sussex, Falmer, Brighton BN1 9QH (United Kingdom)
7. Departamento de AstronomIa, Universidad de Chile, Casilla 36-D, Santiago (Chile)
8. Department of Astronomy, University of Arizona, 933N Cherry Ave., Tucson, AZ 85721 (United States)
9. CACR, California Institute of Technology, Pasadena, CA 91125 (United States)

The 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 40-150 h{sup -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 150 h{sup -1} comoving Mpc embedded in large quasar groups (LQGs) extending over at least 200 h{sup -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 {approx} 1 is flat (in f{sub {lambda}}) in the rest-frame wavelength range from 1500 A to 4000 A, 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. Similar conclusions come from the calculation of the 2-point correlation function, showing a 2{sigma} overdensity for the LBGs in the z {approx} 0.8 LQG on scales of 1.6 to 4.8 Mpc, indicating similar correlation scales for our LBG sample as their z {approx} 3 counterparts.

• OSTI ID: 21333810
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 702; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CORRELATION FUNCTIONS
DISTANCE
ENERGY SPECTRA
GALACTIC EVOLUTION
GALAXIES
LUMINOSITY
QUASARS
RED SHIFT
STARS
UNIVERSE