Constraining magnetization of gamma-ray bursts outflows using prompt emission fluence

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dc.contributor.authorPe'er, Asaf
dc.contributor.funderSeventh Framework Programme
dc.contributor.funderNational Aeronautics and Space Administration
dc.date.accessioned2018-09-24T12:36:58Z
dc.date.available2018-09-24T12:36:58Z
dc.date.issued2017
dc.description.abstractConsidered here is the acceleration and heating of relativistic outflow by local magnetic energy dissipation process in Poynting-flux dominated outflow. Adopting the standard assumption that the reconnection rate scales with the Alfven speed, I show here that the fraction of energy dissipated as thermal photons cannot exceed (13 (gamma) over cap -14)(-1) = 30% (for adiabatic index (gamma) over cap = 4/3) of the kinetic energy at the photosphere. Even in the most radiatively efficient scenario, the energy released as non-thermal photons during the prompt phase is at most equal to the kinetic energy of the outflow. These results imply that calorimetry of the kinetic energy that can be done during the afterglow phase could be used to constrain the magnetization of gamma-ray bursts (GRB) outflows. I discuss the recent observational status and its implications on constraining the magnetization in GRB outflows.en
dc.description.sponsorshipNational Aeronautics and Space Administration (NNX12AO83G).en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid200
dc.identifier.citationAsaf, P. (2017) 'Constraining magnetization of gamma-ray bursts outflows using prompt emission fluence', Astrophysical Journal, 850(2), 200 (8pp). doi: 10.3847/1538-4357/aa974een
dc.identifier.doi10.3847/1538-4357/aa974e
dc.identifier.endpage8
dc.identifier.issn0004-637X
dc.identifier.issued2
dc.identifier.journaltitleAstrophysical Journalen
dc.identifier.startpage1
dc.identifier.urihttps://hdl.handle.net/10468/6877
dc.identifier.volume850
dc.language.isoenen
dc.publisherIOP Publishing Ltden
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/618499/EU/Transient-Sky/TRANSIENT-SKY
dc.relation.urihttp://iopscience.iop.org/article/10.3847/1538-4357/aa974e/meta
dc.rights© 2017, The American Astronomical Society. All rights reserved.en
dc.subjectStarsen
dc.subjectGamma-ray bursten
dc.subjectGeneralen
dc.subjectMagnetic reconnectionen
dc.subjectMagnetohydrodynamics (MHDen
dc.subjectPlasmasen
dc.subjectRadiation mechanismsen
dc.subjectNon-thermalen
dc.subjectRadiation mechanismsen
dc.subjectThermalen
dc.titleConstraining magnetization of gamma-ray bursts outflows using prompt emission fluenceen
dc.typeArticle (peer-reviewed)en
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