Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011201k&link_type=abstract
American Astronomical Society Meeting 210, #112.01; Bulletin of the American Astronomical Society, Vol. 39, p.236
Astronomy and Astrophysics
Astronomy
Scientific paper
We report near-infrared KPNO 2.1m SQIID photometry of 45 Sloan Digital Sky Survey (SDSS) quasars ranging in redshifts from z = 1.867 to 4.250. Combining our JHKs photometry with reported optical magnitudes, we model the spectral energy distribution as a power law of the form fν proportional to να and compute the spectral index, α, for each quasar. We find an average spectral index of <α> = -0.55, close to the traditionally adopted value of -0.5, but also find a large spread in values from α = 0.17 to -1.77. We also see some evidence for evolution with redshift of the form α = 0.15 z - 0.96. Applying this evolution to quasar luminosity functions, such as those of Richards et al. (2006, AJ, 131, 2766) which utilizes the SDSS 3DR quasar catalog, we find that the drop in space densities from the peak at z ≈ 2.5 to higher redshifts is less pronounced compared to using an average spectral index α = -0.5 when computing quasar K-corrections. This project was funded by an NSF ADVANCE Fellowship.
Bursick Shelly
Kennefick Julia D.
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