Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-06-25
The Astrophysical Journal, Volume 701 (2009), Issue 1, pp. 635-641
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
7 pages, 7 figures. Accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/701/1/635
Future X-ray instrumentation is expected to allow us to significantly improve the constraints derivedfrom the Fe K lines in AGN, such as the black-hole angular momentum (spin) and the inclination angle of the putative accretion disk. We consider the possibility that measurements of the persistent, time-averaged Fe K line emission from the disk could be supplemented by the observation of a localized flare, or "hotspot", orbiting close to the black hole. Although observationally challenging, such measurements would recover some of the information loss that is inherent to the radially-integrated line profiles. We present calculations for this scenario to assess the extent to which, in principle, black-hole spin may be measured. We quantify the feasibility of this approach using realistic assumptions about likely measurement uncertainties.
Dovciak Michael
Karas Vladimir
Murphy Kendrah D.
Yaqoob Tahir
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