X-Rays from Active Galactic Nuclei
نویسندگان
چکیده
منابع مشابه
Unification of Active Galactic Nuclei at X-rays and soft gamma-rays
The unification of X-ray and radio selected BL Lacs has been an outstanding problem in the blazar research in the past years. Recent investigations have shown that the gap between the two classes can be filled with intermediate objects and that apparently all differences can be explained by mutual shifts of the peak frequencies of the synchrotron and inverse Compton component of the emission. W...
متن کاملThe innermost regions of Active Galactic Nuclei – from radio to X-rays
1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany [email protected] 2 Astrophysics Science Division, Code 662, NASA’s Goddard Space Flight Center, Greenbelt Road, Greenbelt, MD 20771, USA mkadler, tueller, [email protected] 3 Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany [email protected]...
متن کاملX-ray absorption in Active Galactic Nuclei
We review some of the main physical and statistical properties of the X-ray absorber in AGNs. In particular, we review the distribution of the absorbing column density inferred from X-ray observations of various AGN samples. We discuss the location of the X-ray absorber and the relation with the dust absorption at optical and infrared wavelengths. Finally, we shortly review the recent findings ...
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The properties of the absorption in type 2, narrow line AGNs are reviewed by focusing on the X-ray indicators. I discuss the properties of the cold absorbing medium (the putative torus) and of the reprocessed components, as well as their implications for the unified model. The relation between optical classification and X-ray absorption is examined. The case of “fossil” AGNs, whose type 2 class...
متن کاملNaked active galactic nuclei
In this paper we report the discovery of a new class of active galactic nucleus in which although the nucleus is viewed directly, no broad emission lines are present. The results are based on a survey for AGN in which a sample of about 800 quasars and emission line galaxies were monitored yearly for 25 years. Among the emission line galaxies was the expected population of Seyfert 2 galaxies wit...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1983
ISSN: 1539-2996
DOI: 10.1017/s1539299600005499