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dc.contributor.authorLiang, Edison
Fu, Wen
Böttcher, Markus
dc.date.accessioned 2017-10-27T13:26:31Z
dc.date.available 2017-10-27T13:26:31Z
dc.date.issued 2017
dc.identifier.citation Liang, Edison, Fu, Wen and Böttcher, Markus. "Relativistic Shear Flow between Electron–Ion and Electron–Positron Plasmas and Astrophysical Applications." The Astrophysical Journal, 847, no. 2 (2017) IOP Publishing: https://doi.org/10.3847/1538-4357/aa8772.
dc.identifier.urihttps://hdl.handle.net/1911/97809
dc.description.abstract We present particle-in-cell simulation results of relativistic shear boundary layers between electron–ion and electron–positron plasmas and discuss their potential applications to astrophysics. Specifically, we find that in the case of a fast electron–positron spine surrounded by a slow-moving or stationary electron–ion sheath, lepton acceleration proceeds in a highly anisotropic manner due to electromagnetic fields created at the shear interface. While the highest-energy leptons still produce a beaming pattern (as seen in the quasi-stationary frame of the sheath) of order 1/Γ, where Γ is the bulk Lorentz factor of the spine, for lower-energy particles, the beaming is much less pronounced. This is in stark contrast to the case of pure electron–ion shear layers, in which anisotropic particle acceleration leads to significantly narrower beaming patterns than 1/Γ for the highest-energy particles. In either case, shear-layer acceleration is expected to produce strongly angle-dependent lepton (hence, emanating radiation) spectra, with a significantly harder spectrum in the forward direction than viewed from larger off-axis angles, much beyond the regular Doppler boosting effect from a co-moving isotropic lepton distribution. This may solve the problem of the need for high (and apparently arbitrarily chosen) minimum Lorentz factors of radiating electrons, often plaguing current blazar and GRB jet modeling efforts.
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title Relativistic Shear Flow between Electron–Ion and Electron–Positron Plasmas and Astrophysical Applications
dc.type Journal article
dc.citation.journalTitle The Astrophysical Journal
dc.citation.volumeNumber 847
dc.citation.issueNumber 2
dc.identifier.digital Liang_2017_ApJ_847_90
dc.type.dcmi Text
dc.identifier.doihttps://doi.org/10.3847/1538-4357/aa8772
dc.type.publication publisher version
dc.citation.articleNumber 90


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