Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112..909s&link_type=abstract
Astronomical Journal v.112, p.909
Astronomy and Astrophysics
Astronomy
3
Galaxies: Active, Quasars: General, Radiation Mechanisms: Thermal
Scientific paper
The possibility that radio-quiet active galactic nuclei (AGN) are those that have misdirected anisotropic radio-x-ray emission is considered and ruled out. Rather it is argued that they are systems with fundamentally different physics. Arguments are also presented that the so-called radio- quiet quasi-stellar objects (QSOs) are not self-absorbed nonthermal sources. Both radio-quiet AGN and QSOs are probably compact thermal (CT) systems in which, lacking any better alternative hypothesis, thermal accretion is the predominant luminosity production mechanism. The terms radio loud and radio quiet should be reconsidered (or at least defined consistently) because some objects have sufficient radio emission to be classified by some definitions as radio loud, yet they are best described as CT from an analysis of their spectral distribution, with essentially no significant luminosity produced by nonthermal processes. Estimates of the intrinsic far-mid-infrared spectral slope of CT sources and the efficiency of relativistic particle acceleration in these objects are also made. CT sources are expected to have relatively flat [F(ν) is proportional to ν^-1^, νFν is proportional to ν^0^] infrared spectra in general agreement with observation.
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