Explanatory supplement of the ISOGAL-DENIS Point Source Catalogue ^*,**

¹ Institut d'Astrophysique de Paris, CNRS, 98 bis Bd Arago, 75014 Paris, France
² Physical Research Laboratory, Navarangpura, Ahmedabad 380009, India
³ Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA Leiden, The Netherlands
⁴ Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium
⁵ GEPI, Observatoire de Paris, 61 Av. de l'Observatoire, 75014 Paris, France
⁶ Laboratoire de radioastronomie millimétrique, École Normale Supérieure & Observatoire de Paris, France
⁷ Osservatorio Astrofisico di Arcetri, Largo E. Fermi, 5, 50125 Firenze, Italy

Corresponding author: F. Schuller, schuller@iap.fr

Received: 20 August 2002
Accepted: 13 March 2003

Abstract

We present version 1.0 of the ISOGAL–DENIS Point Source Catalogue (PSC), containing more than 100 000 point sources detected at 7 and/or 15 μm in the ISOGAL survey of the inner Galaxy with the ISOCAM instrument on board the Infrared Space Observatory (ISO). These sources are cross-identified, wherever possible, with near-infrared (0.8–2.2 μm) data from the DENIS survey. The overall surface covered by the ISOGAL survey is about 16 square degrees, mostly (95%) distributed near the Galactic plane (), where the source extraction can become confusion limited and perturbed by the high background emission. Therefore, special care has been taken aimed at limiting the photometric error to ~mag down to a sensitivity limit of typically mJy. The present paper gives a complete description of the entries and the information which can be found in this catalogue, as well as a detailed discussion of the data processing and the quality checks which have been completed. The catalogue is available at the Centre de Données Astronomiques de Strasbourg (via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/403/955) and also via the server at the Institut d'Astrophysique de Paris (http://www-isogal.iap.fr/). A more complete version of this paper, including a detailed description of the data processing, is available in electronic form through the ADS service and at http://www.edpsciences.org.