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The iron $K_alpha$-line as a tool for an evaluation of black hole parameters
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The iron Kα-line as a tool for an evaluation of
black hole parameters
A.F. Zakharov
Institute of Theoretical and Experimental Physics, Moscow
Astro Space Center of Lebedev Physics Institute, Moscow, Russia
Abstract. Recent X-ray observations of microquasars and Seyfert galaxies reveal broad emission
lines in their spectra, which can arise in the innermost parts of accretion disks. Simulations indicate
that at low inclination angle the line is measured by a distant observer as characteristic two-peak
profile. However, at high inclination angles ( 850) two additional peaks arise. This phenomenon
was discovered by Matt et al. (1993) using the Schwarzschild black hole metric to analyze such
effect. They assumed that the effect is applicable to a Kerr metric far beyond the range of parameters
that they exploited. We check and confirm their hypothesis about such a structure of the spectral line
shape for the Kerr metric case. We use no astrophysical assumptions about the physical structure of
the emission region except the assumption that the region should be narrow enough. Positions and
heights of these extra peaks drastically depend on both the radial coordinate of the emitting region
(annuli) and the inclination angle. It was found that these extra peaks arise due to gravitational lens
effect in the strong gravitational field, namely they are formed by photons with some number of
revolutions around black hole. This conclusion is based only on relativistic calculations without any
assumption about physical parameters of the accretion disc like X-ray surface emissivity etc. We
discuss how analysis of the iron spectral line shapes could give an information about an upper limit
of magnetic field near black hole horizon.
SIGNATURES OF HIGHLY INCLINATED ACCRETION DISKS
NEAR GBHCS AND AGNS
More than ten years ago it was predicted that profiles of lines emitted by AGNs and
X-ray binary systems
1
could have
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