One of the methods of study of black holes in astrophysics is based onbroadening of the spectrum of radiation of ionized Iron atoms. The lineK$\alpha$ associated with Iron emission at 6.4 keV is very narrow. If such anion is revolving around a black hole, this line is effectively broadened as aresult of the Doppler and gravitational redshift effects. The profile of thebroaden spectrum contains information about the gravitational field of theblack hole. In the presence of a regular magnetic field in the vicinity of ablack holes the characteristics of the motion of charged ions are modified. Inparticular, their innermost stable circular orbits become closer to thehorizon. The purpose of this work is to study how this effect modifies thespectrum broadening of lines emitted by such an ion. Our final goal is toanalyze whether the change of the spectrum profiles can give us informationabout the magnetic field in the black hole vicinity.
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