A Search for the Earliest Luminous Quasars

Details A Search for the Earliest Luminous Quasars A Search for the Earliest Luminous Quasars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7226g&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #72.26; Bulletin of the American Astronomical Society, V

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Luminous quasars at z > 6 are powerful probes of early structure formation and reionization. Optical panoramic surveys such as SDSS and PQ are limited to redshifts less than 6.5 by the CCD technology, and IR surveys are needed in order to push to higher redshifts. We conducted a search for z > 6.5 quasars using the early data release from UKIDSS matched to the SDSS and PQ. We selected candidates using multi-color selection in i,z,Y,J,H and K bands and further refined our candidate list with deeper imaging from P200+LFC. The surviving 18 candidates were followed up spectroscopically with Keck+NIRSPEC or LRIS. All turned out to be brown dwarfs, which was not surprising: the probability of finding such a quasar in the 27.3 square degrees of the EDR is < 10%. However the experience gained in this pilot project has allowed us to refine our technique for the extended search with the UKIDSS DR1 which is already underway.

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