Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...198...16k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 198, no. 1-2, June 1988, p. 16-32.
Astronomy and Astrophysics
Astronomy
12
Accretion Disks, Active Galactic Nuclei, Quasars, X Ray Sources, Black Holes (Astronomy), Infrared Sources (Astronomy), Spectral Energy Distribution, Synchrotron Radiation, X Ray Spectra
Scientific paper
The radio to X-ray properties of the quasar III Zw 2 are investigated, and the physical conditions in several parts of the nucleus are derived. The accretion disk has a large thickness in the central part (maximum relative thickness 0.8) and probably extends to 0.2 pc, thus hiding a certain part (30 percent) of the broad-line-region clouds. A very compact X-ray source (about 3 Schwarzschild radii) radiating near the Eddington limit is fed by soft disk photons, which are scattered by the inverse Compton effect up to X-ray energies. Due to the disk thickness the X-rays show a moderate degree of beaming. The accretion rate on the 5 x 10 to the 7th solar mass central black hole is that high that the accretion process cannot have lasted longer than 20 million years. Finally, observations of a rapid X-ray absorption feature in III Zw 2 are interpreted as photoabsorption due to a fast infalling (about 0.5c), hot (10 to the 6th K) cloud near the innermost radius (10 to the 14th m) it can reach before being dissolved.
de Korte Piet A. J.
Kaastra Jelle S.
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