AC2 - MHD processes near compact objects |
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Speaker |
Ikhsanov, Nazar |
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Coauthors |
N.G. Beskrovnaya |
| Talk Title |
Magnetic-levitation accretion by neutron stars |
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Abstract |
Quasi-spherical and Keplerian disk accretion scenarios encounter major difficulties explaining the origin and observed spin evolution of long-period X-ray pulsars. We show that these difficulties reflect an oversimplification of the scenarios in which the magnetic field of the accretion flow is neglected. We find that the accretion picture onto a neutron star which captures material from a magnetized wind differs from those previously suggested. It can be explained in terms of a dense non-Keplerian magnetic disk in which the material is confined by its intrinsic magnetic field. This scenario (a so called Magnetic-Levitation Accretion, MLA) is actively investigated for the case of a black hole for more than 40 years but has been applied to the case of a neutron star only recently. We find that a neutron star accreting material from the magnetically-levitating disk (MAGLEV-disk) brakes harder and the radius of its magnetosphere is significantly smaller than that evaluated in the traditional non-magnetic accretion flow scenarios. We show that the mass-transfer towards the neutron star in MLA scenario is governed by anomalous diffusion and the expected appearance of the MLA pulsar are in a good agreement with observations. |
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