Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pobeo..86..153j&link_type=abstract
Publications of the Astronomical Observatory of Belgrade, vol. 86, pp. 153-160
Astronomy and Astrophysics
Astronomy
Scientific paper
A broad emission line Fe Kα at 6.4 keV with asymmetric profile (a narrow bright blue peak and a wide faint red wing) has been observed in a number of type 1 Active Galactic Nuclei (AGN). In some cases the line width corresponds to one third of speed of light, indicating that its emitters rotate with relativistic velocities. Therefore, the line is probably produced in a very compact region near the central black hole (BH) of AGN and can provide us some essential information about the plasma conditions and the space-time geometry in vicinity of the BH. The X-ray radiation of AGN, in the line, as well as in the continuum, has rapid and irregular variability. This variability could be due to disk instability, resulting in perturbations of the disk emissivity, or it could be caused by some external effects, such as gravitational microlensing (especially in the case of gravitationally lensed quasars) and absorption. Here we present a short overview and main results of our recent investigations of the Fe Kα spectral line and X-ray continuum variability.
Jovanovic Pedja
Popovic Luka C.
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