Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..119c&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
9
Accretion Disks, Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Ultraviolet Radiation, Continuous Radiation, X Ray Absorption, X Ray Sources
Scientific paper
The origin of the UV-bump is looked for in the framework of the model of a black hole fuelled by accretion. It is emitted by a medium of large optical thickness and large spatial covering factor. Assuming that the X-ray source is located near the black hole, the absence of hard X-ray absorption constrains this medium to be a flat extended structure, most likely identified with a disk. The 'cold blob model' is ruled out and it is shown that the UV-bump cannot be produced in a radial accretion flow. This does not exclude however that a large fraction of the accretion flow is radial. It is then argued that the disk does not only emit the optical-UV continuum, but should also contribute to the line emission, in particular to the line wings. This picture leads to strong constraints, since models based on fitting both the continuum and the lines can be used to determine the central mass and the accretion rate. They lead to the result that the disk does not necessarily draw the whole mass rate required to fuel the black hole at the bolometric luminosity.
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