Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..253b&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Observational astronomy is characterized by an increasing number of large surveys from which catalogs of several tens of millions of celestial objects are extracted. For this reason, astronomical image analysis should be performed with fast automatic tools such as SExtractor (Bertin & Arnouts 1996). We present here an optimization of the extraction parameters of SExtractor from simulated images (using SkyMaker by E. Bertin). We implemented it on deep multiband images of the cluster of galaxies Abell 85 obtained with the MegaPrime/MegaCam imaging facility at the CFHT. Using the optimized parameters, we reach both a completeness and a reliability of 90% at i=24.5, which means a gain of 0.5 to 1 magnitude in galaxy extraction. Moreover, we introduce here two filters to reduce artefacts. This should allow to derive its galaxy luminosity function (GLF) deeply.
Boué Gwenaël
Durret Florence
Mamon Gary
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