The iron Kα lines as a tool for magnetic field estimations in non-flat accretion flows |
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| Authors: | AF Zakharov Z Ma Y Bao |
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| Institution: | aNational Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;bRussian Scientific Centre – Institute of Theoretical and Experimental Physics, Department of Astrophysics, B. Cheremushkinskaya, 25, 117259, Moscow, Russia;cAstro Space Centre of Lebedev Physics Institute, Moscow, Russia;dDepartment of Mechanics, Zhongshan University, Guangzhou 510275, China |
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| Abstract: | Observations of AGNs and microquasars by ASCA, RXTE, Chandra and XMM-Newton indicate the existence of broad X-ray emission lines of ionized heavy elements in their spectra. Such spectral lines were discovered also in X-ray spectra of neutron stars and X-ray afterglows of GRBs. Recently, Zakharov et al. MNRAS 342 (2003) 1325] described a procedure to estimate an upper limit of the magnetic fields in regions from which X-ray photons are emitted. The authors simulated typical profiles of the iron Kα line in the presence of magnetic field and compared them with observational data in the framework of the widely accepted accretion disk model. Here we further consider typical Zeeman splitting in the framework of a model of non-flat accretion flows, which is a generalization of previous consideration into non-equatorial plane motion of particles emitting X-ray photons. Using perspective facilities of space borne instruments (e.g., Constellation-X mission) a better resolution of the blue peak structure of iron Kα line will allow to evaluate the magnetic fields with higher accuracy. |
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| Keywords: | Black hole physics Magnetic fields Zeeman effect accretion Line: profiles X-rays Black hole Zeeman effect Seyfert galaxies: MCG-6-30-15 |
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