Volume 405, Number 3, July III 2003
|Page(s)||1169 - 1176|
|Published online||30 June 2003|
Increasing the reliability of ISOCAM cross-identifications by use of a probability pattern*
Observatoire Astronomique de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France
2 ISO Data Centre, Science Operations and Data Systems Division, European Space Agency, Villafranca del Castillo, PO Box 50727, 28080 Madrid, Spain e-mail: firstname.lastname@example.org
3 CEA/DSM/DAPNIA Saclay, Service d'Astroph., L'Orme de Merisiers, Bat. 709, 91191 Gif-sur-Yvette, France e-mail: email@example.com
Corresponding author: S. Derriere, firstname.lastname@example.org
Accepted: 13 March 2003
The built-in play at the wheels of the ISOCAM instrument affects the accuracy of the astrometry of sources from the ISOCAM Parallel Catalogue. We present the results of different methods for cross-identifying ISOCAM sources with reference catalogues in the optical (USNO-A2.0) and in the near infrared (2MASS). For a sample of 7197 ISOCAM sources, the fraction having a real counterpart in the USNO and 2MASS catalogues was estimated to be 95% and 91% respectively. Using a nearest neighbor method for cross-identification, only 74% of the possible associations with USNO (79% with 2MASS) are retrieved. With the use of a so-called probability pattern to perform the associations, these values increase to 77% for USNO and 83% for 2MASS. In addition, the overall reliability of associations increases from 77 to 87% with USNO, and from 81 to 90% with 2MASS.
Key words: catalogs / astrometry / methods: data analysis / methods: statistical / infrared: general
© ESO, 2003
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