Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..129b&link_type=abstract
In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc
Astronomy and Astrophysics
Astronomy
14
Accretion Disks, Active Galactic Nuclei, Continuous Radiation, Infrared Astronomy, Quasars, Radio Observation, Blazars, Near Infrared Radiation, Nonthermal Radiation, Thermal Emission
Scientific paper
Observations from the IR through radio are reviewed insofar as they pertain to the possible existence of accretion disks (ADs). The most important question is whether the near-IR component extends into the optical to soften the hard AD component, as required by recent studies fitting quasar continua with AD models. A nonthermal IR power law is usually invoked for this purpose. The competing model for the IR, thermal emission from dust, does not fit the bill since dust spectra cut off sharply at about 1 micron. I argue that the current observational situation poses serious problems for the nonthermal model, while strongly supporting the dust model. The observations discussed here that bear on this problem include measurements of variability, source sizes, IR and submillimeter spectral shapes, molecular emission lines, polarization, mid-IR spectra, and the radio continuum.
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