Infrared Properties of High Redshift and X-ray Selected AGN Samples

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dc.creatorWilkes, Belinda J.
dc.creatorHooper, Eric J.
dc.creatorMcLeod, Kim K.
dc.creatorElvis, Martin S.
dc.creatorHughes, David H.
dc.creatorImpey, Chris D.
dc.creatorKuraszkiewicz, Joanna K.
dc.creatorLonsdale, Carol S.
dc.creatorMalkan, Matt A.
dc.creatorMcDowell, Jonathan C.
dc.date2000-01-27
dc.date.accessioned2026-07-07T01:51:56Z
dc.date.available2026-07-07T01:51:56Z
dc.descriptionThe NASA/ISO Key Project on active galactic nuclei (AGN) seeks to better understand the broad-band spectral energy distributions (SEDs) of these sources from radio to X-rays, with particular emphasis on infrared properties. The ISO sample includes a wide variety of AGN types and spans a large redshift range. Two subsamples are considered herein: 8 high-redshift (1 < z < 4.7) quasars; and 22 hard X-ray selected sources. The X-ray selected AGN show a wide range of IR continuum shapes, extending to cooler colors than the optical/radio sample of Elvis et al. (1994). Where a far-IR turnover is clearly observed, the slopes are < 2.5 in all but one case so that non-thermal emission remains a possibility. The highest redshift quasars show extremely strong, hot IR continua requiring ~ 100 solar masses of 500 - 1000 Kelvin dust with ~ 100 times weaker optical emission. Possible explanations for these unusual properties include: reflection of the optical light from material above/below a torus; strong obscuration of the optical continuum; or an intrinsic deficit of optical emission.
dc.description8 pages, 3 figures (2 color), to be published in the Springer Lecture Notes of Physics Series as part of the proceedings for "ISO Surveys of a Dusty Universe," a workshop held at Ringberg Castle, Germany, November 8 - 12, 1999. Requires latex style files for this series: cl2emult.cls, cropmark.sty, lnp.sty, sprmindx.sty, subeqnar.sty (included with submission)
dc.identifierhttps://arxiv.org/abs/astro-ph/0001488
dc.identifierhttp://arxiv.org/abs/astro-ph/0001488
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/460
dc.subjectAstrophysics
dc.titleInfrared Properties of High Redshift and X-ray Selected AGN Samples
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