Accretion and Emission Processes in AGN: the UV-X Connection

Details Accretion and Emission Processes in AGN: the UV-X Connection Accretion and Emission Processes in AGN: the UV-X Connection

2000-03-08

arxiv.org/abs/astro-ph/0003108v1

Astronomy and Astrophysics

Astrophysics

18 pages, 2 figures, to appear in proc. "AGN in their Cosmic Environment", Eds. B. Rocca-Volmerange & H. Sol, EDPS Conf. Serie

Scientific paper

The main characteristics of the average spectrum of radio quiet AGN in the UV and X-ray range are reviewed, and the emission mechanisms are discussed in the framework of accretion disk models, in particular the ``irradiated cold relativistic disk". It is shown that some problems arise in confronting the predictions of the model to the observations. We propose an alternative model in terms of a hot disk surrounded by a cold Compton thick medium. Finally we mention problems with remote regions of the accretion disk.

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