Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20925207t&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #252.07; Bulletin of the American Astronomical Society,
Other
Scientific paper
High-redshift QSOs (z > 5.4) are crucial to understanding the early Universe. Using color selection in the Rz'J filters, we can identify QSO candidates down to z'=23.0 (Vega) in Deep Lens Survey (DLS) field F1, and distinguish them from other populations of objects, such as late M stars and L and T brown dwarfs. We present color results for 0.8 sq. deg. surveyed to J=21.4, along with targeted J observations searching another 1.9 sq. deg. for objects redder than R-z'=3.1. The color selection reduces the number of z > 5.4 QSO candidates from 65 per sq. deg. to only 6 per sq. deg., where we expect 2 QSOs per sq. deg. based on the bright-end luminosity function from SDSS. Follow-up spectroscopy of these targets is ongoing. We also find 20 objects with colors consistent with L & T brown dwarfs, including two with measured proper motions; based on density estimates from other surveys, we would expect 10-15 L & T dwarfs in these high galactic latitude fields. We would also be sensitive to any very bright redshift 7 QSOs in our J fields, as well as possible thick disk or even halo brown dwarfs.
Deep Lens Survey Team
Dell'Antonio Ian
Loomba Dinesh
McGraw Jason
Thompson Dana
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