Hunting for z'-dropout z > 6.5 Quasars in the SWIRE Legacy Fields

Details Hunting for z'-dropout z > 6.5 Quasars in the SWIRE Legacy Fields Hunting for z'-dropout z > 6.5 Quasars in the SWIRE Legacy Fields

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50622w&link_type=abstract

Spitzer Proposal ID #50622

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Scientific paper

A total of 13 quasars at 6 < z < 6.43 have been successfully detected by the Sloan Digital Sky Survey (SDSS) and Canada-France High-z Quasar Survey (CFHQS) using an i'-dropout technique. We propose to extend the search for quasars to z > 6.5 by targeting z'-dropout sources using deep z-band imaging from the Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) combined with IR imaging from the Spitzer SWIRE Legacy Survey. Extrapolation from the quasar luminosity function suggests that there will be 13 quasars at z > 6, and 2 quasars at z > 8 within the 50 square degrees of the SpARCS/SWIRE fields that are brighter than the SWIRE detection limit. Very high redshift quasars are required as targets for The James Webb Space Telescopes's scientific goal of studying 'The End of the Dark Ages: First Light and Reionization', and the work proposed here would develop techniques which could be applied to a Spitzer Warm Mission Survey for high-redshift quasars. Successful detection of high redshift quasars will require careful matching of the optical and Spitzer catalogs, efficient star-galaxy separation, and extensive modelling of Spitzer colors to distinguish as efficiently as possible between quasars and other extremely red optical-IR 'contaminating' sources e.g., cool stars and dusty galaxies. We also propose to search for 'Y' dwarfs, the coolest, and as yet undiscovered, class of brown dwarf.

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