Other
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.9803h&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #98.03; Bulletin of the American Astronomical Society, Vol. 31, p.1517
Other
Scientific paper
The NASA/ISO Key Project on AGN seeks to better understand the spectral energy distributions, particularly in the infrared, of a wide variety of AGN spanning a large range in redshift. The cornerstone of the project is a set observations of 72 AGN with the Infrared Space Observatory (ISO). Photometry with the ISOPHOT instrument spanning 3 - 200 μm is supplemented by ground-based near-IR, optical, and sub-mm photometry, as well as literature data from radio to X-rays. Our sources include radio-loud and quiet quasars, strong X-ray and UV emitters, PG quasars, BALQSOs and red quasars, among other subclasses. While the majority of sources in the sample are at relatively low redshifts, 9 have z > 0.9, with the most distant, 1202-0727, at z = 4.7. This radio-quiet quasar is an unusual object (Wilkes et al. 1999, in ``The Universe as Seen by ISO,'' ESA SP-427, 845), with an IR luminosity 1016 L&sun; , high even if gravitationally lensed (Omont et al. 1996, Nat, 382, 428). Much of the luminosity is emitted in the rest-frame near and mid-IR, which if thermal, represents a large mass of hot (1000K) dust. New sub-mm observations with the JCMT, coupled with ISO data, indicate that the two next-highest redshift AGN in the sample (z = 3.9 and z = 4.3) have similar features. The sub-mm fluxes are up to a factor 5 lower than expected based on scaling a median AGN SED (Elvis et al. 1994, ApJS, 95, 1) to near/mid-IR fluxes. While this is not as extreme as for 1202-0727, it is suggestive of similar rest-frame near-IR excesses. Additionally, the sub-mm slopes are flatter than expected (α ≲ 1 for fν ν α ). If thermal emission dominates in all of these sources, the temperature range of the dust is broad, similar to inferred range of 50-1000K in 1202-0727. See also Wilkes et al. (this meeting) for another Key Project subsample. NASA grant NAG5-3363 is acknowledged.
Elvis Martin S.
Hooper Eric J.
Impey Chris David
Lonsdale Colin J.
Malkan Matthew A.
No associations
LandOfFree
Infrared Excesses in Luminous High-z Quasars from the U.S. ISO Key Project on AGN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Infrared Excesses in Luminous High-z Quasars from the U.S. ISO Key Project on AGN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared Excesses in Luminous High-z Quasars from the U.S. ISO Key Project on AGN will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1746446