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Magnetic field and radius of innermost stable circular orbit near SMBH in AGNs

Magnetic fields in an accretion disk around the central black hole can modify the position of the innermost stable circular orbit (ISCO) radius and produces the difference for the classical Novikov-Thorne radius. We estimated the ISCO magnetic field strength on the base of polarimetric observations of the accretion disk radiation. This estimate can be obtained with taking into account the effect of Faraday rotation of the polarization plane at the length of the free path of photon between successive electron scattering events. In a result we presented the new method for real estimation of the ISCO radius in the accretion disk, i.e. in the nearest vicinity of a central black hole. Our estimations confirmed the V.P. Frolov, A.A. Shoom and C. Tzounis (2014) conclusion that magnetic field produces the effect in a result of which the innermost stable circular orbit becomes closer to the horizon of a black hole.

preprint2015arXivOpen access
M. Yu. PiotrovichYu. N. GnedinN. A. Silant'evT. M. NatsvlishviliS. D. Buliga
astro-ph.GAastro-ph.HE
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M. Yu. PiotrovichYu. N. GnedinN. A. Silant'evT. M. NatsvlishviliS. D. Buliga

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