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M. K. Nordhaus (NOAO/RPI), R. F. Green (KPNO), A. Dey (NOAO), D. Norman (CTIO), K. Brand (NOAO), S. Croom (AAO), S. Warren (Imperial Coll.), P.B. Hall (York), M. I. Brown (Princeton), B. Jannuzi (NOAO), P. Smith (Arizona), M. G. Smith (NOAO), G. Tiede (BGSU), P. J. Green (SAO), D. Eisenstein (Arizona), C. Kochanek (OSU)
When determining the contribution of QSOs to the universal energy budget over the optical-infrared window as a function of cosmic time, a fuller census of accreting objects must include the impact of dust in the host galaxy, in the circumnuclear torus, and in intervening absorbers. Samples of QSOs are isolated using the general fact that QSO spectral energy distributions differ from those of stars. Using the UV-excess selection method, red objects may fall outside of the color selection limits or onto the stellar locus causing them to be excluded from surveys. We use the unique optical and IR deep imaging data provided in the Bootes field of the NOAO Deep Wide-Field Survey to select our quasar candidates. Drawing from a K-limited color-outlier sample with 169 spectroscopic redshifts, we derive an estimate for the fraction of moderately reddened quasars.
Nordhaus’ research was supported by the NOAO/KPNO Research Experiences for Undergraduates (REU) Program which is funded by the National Science Foundation through Scientific Program Order No. 3 (AST-0243875) of the Cooperative Agreement No. AST-0132798 between the Association of Universities for Research in Astronomy (AURA) and the NSF.
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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.