Probing Milky Way's Brown Dwarfs using CFHTLS

Details Probing Milky Way's Brown Dwarfs using CFHTLS Probing Milky Way's Brown Dwarfs using CFHTLS

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..461d&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

We present the results of our ongoing search for field Brown Dwarfs in CFHTLS data. The aim of this survey is the identification of a large sample of cool brown dwarfs to find and study the coolest brown dwarfs. This will also allow to determine the statistics of the brown dwarfs galactic population. To achieve this goal we create optimised object catalogs, using a new version of Sextractor to perform PSF-fitting photometry in dual image mode between the i' and z' images. We then select Brown Dwarf candidates using their extremely red i'-z' color, and obtain follow-up J-band photometry to discriminate them from z=6 quasars. After analysing 235 square degrees of CFHTLS Very Wide and Deep images, we found over 500 new early L to early T dwarfs and several late T dwarfs, as well as the first z>6 quasars outside the SDSS survey. We have obtained spectra of the most interesting candidates.

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