Issue |
A&A
Volume 384, Number 1, MarchII 2002
|
|
---|---|---|
Page(s) | 81 - 98 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20020007 | |
Published online | 15 March 2002 |
ESO Imaging Survey*
Exploring the optical/infrared imaging data of CDF-S: Point sources
1
European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching b. München, Germany
2
Observatoire de la Côte d'Azur, BP 229, 06304 Nice Cedex 4, France
3
Universidade Estadual de Feira de Santana, Campus Universitário, Feira de Santana, BA, Brazil
4
Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen, Denmark
5
Observatório Nacional, Rua Gen. José Cristino 77, Rio de Janerio R.J., Brazil
6
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching b. München, Germany
Corresponding author: E. Hatziminaoglou, ehatzimi@eso.org
Received:
16
August
2001
Accepted:
20
December
2001
This paper describes the methodology currently being implemented in
the EIS pipeline for analysing optical/infrared multi-colour data. The
aim is to identify different classes of objects as well as possible
undesirable features associated with the construction of colour
catalogues. The classification method used is based on the
-fitting of template spectra to the observed SEDs, as measured
through broad-band filters. Its main advantage is the simultaneous use
of all colours, properly weighted by the photometric errors. In
addition, it provides basic information on the properties of the
classified objects (e.g. redshift, effective temperature). These
characteristics make the
-technique ideal for handling large multi-band
datasets. The results are compared to the more traditional
colour-colour selection and, whenever possible, to model
predictions. In order to identify objects with odd colours, either
associated with rare populations or to possible problems in the
catalogue, outliers are searched for in the multi-dimensional colour
space using a nearest-neighbour criterion. Outliers with large
-values are individually inspected to further investigate
their nature. The tools developed are used for a preliminary analysis
of the multi-colour point source catalogue constructed from the
optical/infrared imaging data obtained for the Chandra Deep Field
South (CDF-S). These data are publicly available, representing the
first installment of the ongoing EIS Deep Public Survey.
Key words: surveys / quasars / stars: white dwarves / stars: low mass, brown dwarves
© ESO, 2002
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