The structure of a Quasi-Keplerian accretion disk around magnetized stars

dc.contributor.authorHabumugisha, Isaac
dc.contributor.authorJurua, Edward
dc.contributor.authorTessema, Solomon B
dc.contributor.authorAnguma, Simon Katrini
dc.date.accessioned2020-07-26T20:30:23Z
dc.date.available2020-07-26T20:30:23Z
dc.date.issued2018-06-04
dc.description.abstractIn this paper, we present the complete structure of a quasi-Keplerian thin accretion disk with an internal dynamo around a magnetized neutron star. We assume a full quasi-Keplerian disk with the azimuthal velocity deviating from the Keplerian fashion by a factor of ξ (0 < ξ < 2). In our approach, we vertically integrate the radial component of the momentum equation to obtain the radial pressure gradient equation for a thin quasi-Keplerian accretion disk. Our results show that, at large radial distance, the accretion disk behaves in a Keplerian fashion. However, close to the neutron star, pressure gradient force (PGF) largely modifies the disk structure, resulting into sudden dynamical changes in the accretion disk. The corotation radius is shifted inward (outward) for ξ > 1 (for ξ < 1), and the position of the inner edge with respect to the new corotation radius is also relocated accordingly, as compared to the Keplerian model. The resulting PGF torque couples with viscous torque (when ξ < 1) to provide a spin-down torque and a spin-up torque (when ξ > 1) while in the advective state. Therefore, neglecting the PGF, as has been the case in previous models, is a glaring omission. Our result has the potential to explain the observable dynamic consequences of accretion disks around magnetized neutron stars.en_US
dc.identifier.citationHabumugisha, I., Jurua, E., Tessema, S. B., & Simon, A. K. (2018). The Structure of a Quasi-Keplerian Accretion Disk around Magnetized Stars. The Astrophysical Journal, 859(2), 147.en_US
dc.identifier.urihttps://dir.muni.ac.ug/handle/20.500.12260/346
dc.language.isoenen_US
dc.publisherThe American Astronomical Societyen_US
dc.subjectAccretionen_US
dc.subjectAccretion disksen_US
dc.subjectDynamo – starsen_US
dc.subjectNeutron – X-raysen_US
dc.titleThe structure of a Quasi-Keplerian accretion disk around magnetized starsen_US
dc.typeArticleen_US

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