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Title:
The DEEP2 Galaxy Redshift Survey: Clustering of Galaxies in Early Data
Authors:
Coil, Alison L.; Davis, Marc; Madgwick, Darren S.; Newman, Jeffrey A.; Conselice, Christopher J.; Cooper, Michael; Ellis, Richard S.; Faber, S. M.; Finkbeiner, Douglas P.; Guhathakurta, Puragra; Kaiser, Nick; Koo, David C.; Phillips, Andrew C.; Steidel, Charles C.; Weiner, Benjamin J.; Willmer, Christopher N. A.; Yan, Renbin
Affiliation:
AA(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411.), AB(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411.), AC(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411.), AD(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411.), AE(Department of Astronomy, California Institute of Technology, MS 105-24, Pasadena, CA 91125.), AF(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411.), AG(Department of Astronomy, California Institute of Technology, MS 105-24, Pasadena, CA 91125.), AH(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, 477 Clark Kerr Hall, University of California, Santa Cruz, CA 95064.), AI(Princeton University Observatory, Peyton Hall, Ivy Lane, Princeton, NJ 08544-1001.), AJ(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, 477 Clark Kerr Hall, University of California, Santa Cruz, CA 95064.; Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada.), AK(Institute for Astronomy, 2680 Woodlawn Drive, University of Hawaii, Honolulu, HI 96822.), AL(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, 477 Clark Kerr Hall, University of California, Santa Cruz, CA 95064.), AM(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, 477 Clark Kerr Hall, University of California, Santa Cruz, CA 95064.), AN(Department of Astronomy, California Institute of Technology, MS 105-24, Pasadena, CA 91125.), AO(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, 477 Clark Kerr Hall, University of California, Santa Cruz, CA 95064.), AP(University of California Observatories/Lick Observatory, Department of Astronomy and Astrophysics, 477 Clark Kerr Hall, University of California, Santa Cruz, CA 95064.; On leave from Observatório Nacional, Rio de Janeiro, Brazil.), AQ(Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720-3411.)
Publication:
The Astrophysical Journal, Volume 609, Issue 2, pp. 525-538. (ApJ Homepage)
Publication Date:
07/2004
Origin:
UCP
ApJ Keywords:
Galaxies: Distances and Redshifts, Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Statistics, Cosmology: Large-Scale Structure of Universe, Surveys
DOI:
10.1086/421337
Bibliographic Code:
2004ApJ...609..525C

Abstract

We measure the two-point correlation function ξ(rp,π) in a sample of 2219 galaxies between z=0.7 and 1.35 to a magnitude limit of RAB=24.1 from the first season of the DEEP2 Galaxy Redshift Survey. From ξ(rp,π) we recover the real-space correlation function, ξ(r), which we find can be approximated within the errors by a power law, ξ(r)=(r/r0)-γ, on scales ~0.1-10 h-1 Mpc. In a sample with an effective redshift of zeff=0.82, for a ΛCDM cosmology we find r0=3.53+/-0.81 h-1 Mpc (comoving) and γ=1.66+/-0.12, while in a higher redshift sample with zeff=1.14 we find r0=3.12+/-0.72 h-1 Mpc and γ=1.66+/-0.12. These errors are estimated from mock galaxy catalogs and are dominated by the cosmic variance present in the current data sample. We find that red, absorption-dominated, passively evolving galaxies have a larger clustering scale length, r0, than blue, emission-line, actively star-forming galaxies. Intrinsically brighter galaxies also cluster more strongly than fainter galaxies at z~=1. Our results imply that the DEEP2 galaxies have an effective bias b=0.96+/-0.13 if σ8DM=1 today or b=1.19+/-0.16 if σ8DM=0.8 today. This bias is lower than that predicted by semianalytic simulations at z~=1, which may be the result of our R-band target selection. We discuss possible evolutionary effects within our survey volume, and we compare our results with galaxy-clustering studies at other redshifts, noting that our star-forming sample at z~=1 has selection criteria very similar to the Lyman break galaxies at z~=3 and that our red, absorption-line sample displays a clustering strength comparable to the expected clustering of the Lyman break galaxy descendants at z~=1. Our results demonstrate that galaxy-clustering properties as a function of color, spectral type, and luminosity seen in the local universe were largely in place by z~=1.
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