Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..329c&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
This communication presents the CFHTLS Strong Lensing Legacy Survey (SL2S). Thanks to the unsurpassed combined depth, area and image quality of the Canada-France-Hawaii Legacy Survey it is becoming possible to uncover a large statistically well-defined sample of strong gravitational lenses which spans the dark halo mass spectrum predicted by the concordance model from galaxy to cluster haloes. We describe the innovative technical efforts concerning the development of several automated procedures to find strong lenses of various mass regimes in CFHTLS images. A preliminary sample of 40 strong lensing candidates has been discovered in the CFHTLS T0002 release covering an effective field of view of 28 deg^2. These strong lensing systems consist mainly of gravitational arc systems with splitting angles between 2 and 15 arcsec. Interestingly, this sample shows that it is possible to uncover for the first time a large population of strong lenses from galaxy groups with typical halo mass of about 1013h-1M_&sun;. The SL2S project main scientific aims are (i) to determine the dark matter halo mass spectrum (ii) to constrain the dark matter halo evolution (iii) and to quantify their influence on galaxy and galaxy-group formation and evolution.
Cabanac Remi A.
Fort Bernard
Gavazzi Raphael
Sl2S Team
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