Other
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop..347n&link_type=abstract
NOAO Proposal ID #2003A-0347
Other
Scientific paper
Currently there is only a rudimentary understanding of the conditions that trigger quasar activity. A better understanding of quasars will come with techniques that involve a variety of methods for studying quasar cluster environments over a range of redshifts. The Deep Lens Survey has used weak lensing techniques to detected clusters out to z=0.67. The survey provides information about dark matter content, galaxy colors, distribution and redshifts are available for these newly discovered clusters and the environment of any quasars they may host. However, there are only about 10 quasars currently known in the entire 28 sq. deg. survey. None of the potential information provided by the DLS about quasar environments can be exploited until we identify quasars in these fields. We propose to use ISPI on the Blanco 4m to obtain NIR data that can be combined with the BVRz' data from the DLS to select a sample of quasar candidates to J=21.0 and K_s=18.5 using the K excess and other color selection methods. These methods will be more efficient and less biased that other optical selection methods. Verification of these candidates will then require spectral observations.
Loomba Dinesh
Norman Dara
Smith Malcolm
van der Bliek Nicole
Wittman David
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