Clustering Evolution from a deep, wide-area I-band Galaxy Survey

Details Clustering Evolution from a deep, wide-area I-band Galaxy Survey Clustering Evolution from a deep, wide-area I-band Galaxy Survey

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.1903p&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #19.03; Bulletin of the American Astronomical Society, Vol. 29, p.1241

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present our analyses a catalog of 710,000 galaxies with IAB <= 24. The catalog is derived from a CCD imaging survey performed at the KPNO 4m telescope which covers a contiguous 4(deg) x 4(deg) region. This area is an order of magnitude larger than that of previous contiguous surveys to comparable depth (I = 23.5). The large contiguous area enables us to constrain the topology, frequency, and distribution of large-scale ( ~ 40h(-1) Mpc) structure up to z~1. Immediate products of the survey are objectively derived catalogues of distant galaxies and clusters. We will report constraints on number counts (spanning 12 magnitudes from the same homogeneous data) and on the n-point angular correlation functions. We find evidence for mild galaxy evolution (about 1 mag of brightening or a doubling of the density by I=23 relative to an Omega_o = 1 no evolution model). We also observe evidence for evolution of the spatial correlation function (via Limber's equation). At low redshift (I <= 19), we find good agreement with the APM omega (theta ) values. If the redshift dependence of xi (r) is expressed as xi (r,z) = ({r / r_o})(-gamma ) (1 + z)(-(3+epsilon )) , we find r_o ~ 4h(-1) Mpc, gamma = 0.75+/-0.05, and -1 <= epsilon <= 0 for I >= 20. We will also present estimates of the higher moments of the angular distribution (N=3,4,5) on scales up to 1 degree.

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