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dc.contributor.authorBall, David
dc.contributor.authorSironi, Lorenzo
dc.contributor.authorÖzel, Feryal
dc.date.accessioned2020-02-01T01:29:41Z
dc.date.available2020-02-01T01:29:41Z
dc.date.issued2019-10-11
dc.identifier.citationDavid Ball et al 2019 ApJ 884 57en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab3f2e
dc.identifier.urihttp://hdl.handle.net/10150/636855
dc.description.abstractElectron acceleration during magnetic reconnection is thought to play a key role in time-variable high-energy emission from astrophysical systems. By means of particle-in-cell simulations of transrelativistic reconnection, we investigate electron injection and acceleration mechanisms in low-β electron–proton plasmas. We set up a diversity of density and field structures (e.g., X-points and plasmoids) by varying the guide field strength and choosing whether to trigger reconnection or let it spontaneously evolve. We show that the number of X-points and plasmoids controls the efficiency of electron acceleration, with more X-points leading to a higher efficiency. Using on-the-fly acceleration diagnostics, we also show that the nonideal electric fields associated with X-points play a critical role in the first stages of electron acceleration. As a further diagnostic, we include two populations of test particles that selectively experience only certain components of electric fields. We find that the out-of-plane component of the parallel electric field determines the hardness of the high-energy tail of the electron energy distribution. These results further our understanding of electron acceleration in this regime of magnetic reconnection and have implications for realistic models of black hole accretion flows.en_US
dc.description.sponsorshipNational Science Foundation (NSF) [AST-1715061, ACI1657507]; Chandra award [TM6-17006X]; United States Department of Energy (DOE) [DE-SC0016542]; National Aeronautics & Space Administration (NASA) [NNX-17AG21G]en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectaccretionen_US
dc.subjectaccretion disksen_US
dc.subjectgalaxies: jetsen_US
dc.subjectmagnetic reconnectionen_US
dc.subjectradiation mechanisms: nonthermalen_US
dc.subjectX-rays: binariesen_US
dc.titleThe Mechanism of Electron Injection and Acceleration in Transrelativistic Reconnectionen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Astronen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume884
dc.source.issue1
dc.source.beginpage57
refterms.dateFOA2020-02-01T01:29:42Z


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