EDP Sciences
Free access
Volume 475, Number 3, December I 2007
Page(s) 791 - 799
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20065218

A&A 475, 791-799 (2007)
DOI: 10.1051/0004-6361:20065218

A 12 $\mathsf{\mu}$m ISOCAM survey of the ESO-Sculptor field

Data reduction and analysis
N. Seymour1, 2, B. Rocca-Volmerange1, 3, and V. de Lapparent1

1  Institut d'Astrophysique de Paris, UMR7095 CNRS / Univ. Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France
    e-mail: seymour@ipac.caltech.edu
2  Science Center, California Institute of Technology, Mail Code 220-6, 1200 East California Boulevard, Pasadena, CA 91125, USA
3  Université Paris-Sud, Bât. 121, 91405 Orsay Cedex, France

(Received 16 March 2006 / Accepted 24 May 2007 )

We present a detailed reduction of a mid-infrared 12 $\mu$m (LW10 filter) ISOCAM open time observation performed on the ESO-Sculptor Survey field (Arnouts et al. 1997, A&AS, 124, 163). A complete catalogue of 142 sources (120 galaxies and 22 stars), detected with high significance (equivalent to 5$\sigma$), is presented above an integrated flux density of 0.24 ${\rm mJy}$. Star/galaxy separation is performed by a detailed study of colour-colour diagrams. The catalogue is complete to 1 ${\rm mJy}$ and, below this flux density, the incompleteness is corrected using two independent methods. The first method uses stars and the second uses optical counterparts of the ISOCAM galaxies; these methods yield consistent results. We also apply an empirical flux density calibration using stars in the field. For each star, the 12 $\mu$m flux density is derived by fitting optical colours from a multi-band $\chi^2$ to stellar templates (BaSel-2.0) and using empirical optical-IR colour-colour relations. This article is a companion analysis to our 2007 paper (Rocca-Volmerange et al. 2007, A&A, 475, 801) where the $12~\hbox{$\mu {\rm m}$ }$ faint galaxy counts are presented and analysed per galaxy type with the evolutionary code PÉGASE.3.

Key words: infrared: galaxies -- Galaxy: evolution -- methods: data analysis -- catalogs -- galaxies: photometry

© ESO 2007