A 12 m ISOCAM survey of the ESO-Sculptor field^*,**

Data reduction and analysis

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

Abstract

We present a detailed reduction of a mid-infrared 12 μm (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 5σ), is presented above an integrated flux density of 0.24 . Star/galaxy separation is performed by a detailed study of colour-colour diagrams. The catalogue is complete to 1  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 μm flux density is derived by fitting optical colours from a multi-band 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 faint galaxy counts are presented and analysed per galaxy type with the evolutionary code PÉGASE.3.