Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2001b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #20.01; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The Palomar-QUEST Survey is undertaking a search for very high-redshift quasars. The survey currently covers 15,000 square degrees a minimum of two times in each of 2 filter sets: Johnson UBRI and Gunn rizz. A single scan reaches a depth of mag 20.8 in Johnson I and 19.6 in Gunn z. We have coadded data over our entire survey area in order to find quasars with Gunn z past mag 20. The coadd typically includes four passes in each filter set. We are searching for objects that are bright only in Johnson I and Gunn z, our reddest filters. This will yield quasars with redshift greater than roughly 5.8. Specifically, we target objects with Gunn i-z > 2.2 and Johnson R-I > 3.0. L and T dwarfs have similar optical colors to high-redshift quasars; to remove these we obtain follow-up data in the J band, where the dwarfs are very bright but the quasars are faint. Furthermore, we use an artificial neural network to separate point-like from extended objects.
Currently we are conducting a systematic quasar search over more than 10,000 square degrees of our survey area.
Baltay Charles
Bauer Anne
Djorgovski Stanislav G.
Donalek Ciro
Ellman Nancy
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