Tidal disruption and magnetic flux capture: powering a jet from a quiescent black hole

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Tidal disruption and magnetic flux capture: powering a jet from a quiescent black hole

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dc.contributor.author Kelley, L. Z.
dc.contributor.author Tchekhovskoy, A.
dc.contributor.author Narayan, Ramesh
dc.date.accessioned 2016-08-03T20:03:01Z
dc.date.issued 2014
dc.identifier.citation Kelley, L. Z., A. Tchekhovskoy, and R. Narayan. 2014. “Tidal Disruption and Magnetic Flux Capture: Powering a Jet from a Quiescent Black Hole.” Monthly Notices of the Royal Astronomical Society 445 (4) (October 31): 3919–3938. doi:10.1093/mnras/stu2041. en_US
dc.identifier.issn 0035-8711 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:27801833
dc.description.abstract The transient Swift J1644+57 is believed to have been produced by an unlucky star wandering too close to a supermassive black hole (BH) leading to a tidal disruption event. This unusual flare displayed highly super-Eddington X-ray emission which likely originated in a relativistic, collimated jet. This presents challenges to modern accretion and jet theory as upper limits of prior BH activity, which we obtain from the radio afterglow of this event, imply that both the pre-disruption BH and stellar magnetic fluxes fall many orders of magnitude short of what is required to power the observed X-ray luminosity. We argue that a pre-existing, “fossil” accretion disc can contain a sufficient reservoir of magnetic flux and that the stellar debris stream is capable of dragging this flux into the BH. To demonstrate this, we perform local, 3D magnetohydrodynamic simulations of the disc–stream interaction and demonstrate that the interface between the two is unstable to mixing. This mixing entrains a sufficient amount of fossil disc magnetic flux into the infalling stellar debris to power the jet. We argue that the interaction with the fossil disc can have a pronounced effect on the structure and dynamics of mass fallback and likely the resulting transient. Finally, we describe possible ramifications of these interactions on unresolved problems in tidal disruption dynamics, in particular, the efficiency of debris circularization, and effects of the disruption on the preexisting black hole system. Animations online: http://goo.gl/T84tLs en_US
dc.description.sponsorship Astronomy en_US
dc.language.iso en_US en_US
dc.publisher Oxford University Press (OUP) en_US
dc.relation.isversionof doi:10.1093/mnras/stu2041 en_US
dc.relation.hasversion https://arxiv.org/abs/1410.0366 en_US
dash.license OAP
dc.subject MHD en_US
dc.subject stars:black holes en_US
dc.subject galaxies: jets en_US
dc.subject quasars: supermassive black holes en_US
dc.subject galaxies: kinematics and dynamics en_US
dc.title Tidal disruption and magnetic flux capture: powering a jet from a quiescent black hole en_US
dc.type Journal Article en_US
dc.description.version Accepted Manuscript en_US
dc.relation.journal Monthly Notices of the Royal Astronomical Society en_US
dash.depositing.author Narayan, Ramesh
dc.date.available 2016-08-03T20:03:01Z

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