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Title:
The ESO-Sculptor faint galaxy redshift survey: The photometric sample
Authors:
Arnouts, S.; de Lapparent, V.; Mathez, G.; Mazure, A.; Mellier, Y.; Bertin, E.; Kruszewski, A.
Affiliation:
AA(CNRS, Institut d'Astrophysique de Paris, 98 bis, Boulevard Arago, F-75014 Paris, France), AB(CNRS, Institut d'Astrophysique de Paris, 98 bis, Boulevard Arago, F-75014 Paris, France), AC(Observatoire Midi-Pyrenees, Laboratoire d'Astrophysique de Toulouse, URA 285, 14, avenue Edouard Belin, F-31400 Toulouse, France), AD(Laboratoire d'Astronomie Spatiale, B.P. No. 8, F-13376 Marseille Cedex 12, France), AE(CNRS, Institut d'Astrophysique de Paris, 98 bis, Boulevard Arago, F-75014 Paris, France and Observatoire Midi-Pyrenees, Laboratoire d'Astrophysique de Toulouse, URA 285, 14, avenue Edouard Belin, F-31400 Toulouse, France), AF(CNRS, Institut d'Astrophysique de Paris, 98 bis, Boulevard Arago, F-75014 Paris, France and European Southern Observatory, Casilla 19001, Santiago, Chile), AG(Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw, Poland)
Publication:
A & A Supplement series, Vol. 124, July 1997, 163-182. (A&AS Homepage)
Publication Date:
07/1997
Origin:
A&AS
Astronomy Keywords:
GALAXIES: REDSHIFTS, PHOTOMETRY, COSMOLOGY: OBSERVATIONS
DOI:
10.1051/aas:1997187
Bibliographic Code:
1997A&AS..124..163A

Abstract

We present the photometric sample of a faint galaxy survey carried out in the southern hemisphere, using CCD imaging at the 3.60 m and NTT-3.5 m telescopes at La Silla (ESO). The survey area is a continuous strip of 0.2 deg X 1.53 deg located at high galactic latitude (bII ~ -83 deg) in the Sculptor constellation. The photometric survey provides total magnitudes in the bands B, V (Johnson) and R (Cousins) to limiting magnitudes of 24.5, 24.0, 23.5 respectively. To these limits, the catalog contains about 9500, 12150, 13000 galaxies in B, V, R bands respectively and is the first large digital multi-colour photometric catalog at this depth. This photometric survey also provides the entry catalog for a fully-sampled redshift survey of ~700 galaxies with R <= 20.5 \cite[(Bellanger et al. 1995a).]{Bellan95a} In this paper, we describe the photometric observations and the steps used in the data reduction. The analysis of objects and the star-galaxy separation with a neural network are performed using SExtractor, a new photometric software developed by \cite[E. Bertin (1996).]{Bertin96} By application of SExtractor to simulated frames and comparison of multiple measurements, we estimate that the photometric accuracy of our catalog is ~0.05m for R <= 22. Then, we use a method to obtain a homogeneous photometric scale over the whole survey using the overlapping regions of neighbouring CCDs. The differential galaxy number counts in B, V, R are in good agreement with previously published CCD studies and confirm the evidence for significant evolution at faint magnitudes as compared to a standard non evolving model (by factors 3.6, 2.6, 2.1). The galaxy colour distributions B-R, B-V of our sample show a blueing trend of ~0.5m between 21 < R < 23.5 in contrast to the V-R colour distribution where no significant evolution is observed. Based on observations collected at the European Southern Observatory, La Silla, Chile.
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