Magnetic fields and quasi-periodic oscillations of black hole radiation

Details Magnetic fields and quasi-periodic oscillations of black hole radiation Magnetic fields and quasi-periodic oscillations of black hole radiation

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astbu..66..320p&link_type=abstract

Astrophysical Bulletin, Volume 66, Issue 3, pp.320-324

Physics

Physical Data And Processes, Black Hole Physics

Scientific paper

Various relations are found between the key parameters of black holes and active galactic nuclei. Some have a statistical property, others follow from the theoretical consideration of the evolution of these objects. In this paper we use a recently discovered empirical relation between the characteristic frequency of quasi-periodic oscillations of radiation ν br of black holes, their masses and matter accretion rates to determine the magnetic field strength B H at the black hole event horizon. Since the characteristic frequency can be determined from observations, the use of a new relation for the estimations of magnetic field B H can yield more definite results, since we are decreasing the number of the unknown or poorly-determined parameters of objects (it especially concerns the accretion rate Ṁ). The typical values which we have found are B H ≃ 108G for the stellar mass black holes, and B H ≃ 104G for the supermassive black holes. Besides, we demonstrate that if the linear polarization of an object is caused by the radiation of a magnetized accretion disk, then the degree of observable polarization is p ˜ ν {/br -1/2}.

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