AAS Meeting #193 - Austin, Texas, January 1999
Session 20. Radio Galaxies and Quasars I
Oral, Wednesday, January 6, 1999, 10:00-11:30am, Room 6 (A and B)

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[20.04] Radio--X-ray Spectral Energy Distributions of High-redshift Quasars Observed with ISO

B.J. Wilkes, E. J. Hooper (SAO), K. McLeod (Wellesley), M. Elvis (SAO), C. D. Impey (UofA), C. Lonsdale (IPAC), M. A. Malkan (UCLA), J. McDowell (SAO)

Over the past decade studies of the spectral energy distributions (SEDs) of quasars have become widespread largely due to technological advances which facilitate deeper observations over wider wavelength ranges. Our understanding of the energy generation mechanisms at work has correspondingly increased. The ISO satellite has provided important new observational capability in the far-infrared (IR), with nearly simultaneous coverage from 3--200 \mum. Observations with ISO extend the IRAS database, which covers 12-100 \mum in 4 bands, in wavelength range, spatial resolution and to somewhat deeper flux levels. This has allowed observations to be made of a larger proportion of the quasar population and extension to high redshift (z) for the first time.

Our program has obtained photometry with ISOPHOT in 8 bands from 5 to 200 \mum for 72 quasars and Seyfert galaxies having a wide variety of properties. The sample includes subsets which are X-ray, optically and IR selected and covers a wide range of redshift. This paper will present preliminary analysis of the 9 high redshift quasars (1

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