Brown Dwarf Candidates in the Deep Lens Survey

Details Brown Dwarf Candidates in the Deep Lens Survey Brown Dwarf Candidates in the Deep Lens Survey

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7808t&link_type=abstract

American Astronomical Society Meeting 210, #78.08; Bulletin of the American Astronomical Society, Vol. 39, p.186

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Scientific paper

M, L, and T dwarfs make up a substantial fraction of nearby galactic objects, but most are known from shallow, large-area surveys. By combining Deep Lens Survey (DLS) deep pencil-beam optical (BVRz') data with 0.8 sq. deg. of J=21.4 survey data, and another 1.9 sq. deg. of J observations targeting very red (R-z' > 3.5) objects, we detect 11.5 very faint red objects per sq. deg., of which only 2 per sq. deg. have measured z'-J > 2 (Vega), consistent with brown dwarfs, including two objects with measured proper motion. The DLS fields lie at high galactic latitude, and the median J depth is sufficient to detect dwarfs as late as T6 out at the scale height of the thin disk, which may help confirm the distribution of ultracool dwarfs in the galaxy. Future follow-up spectra might also reveal differences in metallicity or age between nearby dwarfs and these very distant field dwarfs.

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