Show simple item record

dc.contributor.authorNarayan, Ramesh
dc.contributor.authorKumar, Pawan
dc.contributor.authorTchekhovskoy, Alexander
dc.date.accessioned2016-08-04T20:19:22Z
dc.date.issued2011
dc.identifier.citationNarayan, Ramesh, Pawan Kumar, and Alexander Tchekhovskoy. 2011. “Constraints on Cold Magnetized Shocks in Gamma-Ray Bursts.” Monthly Notices of the Royal Astronomical Society 416 (3) (August 8): 2193–2201. doi:10.1111/j.1365-2966.2011.19197.x.en_US
dc.identifier.issn0035-8711en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:27804415
dc.description.abstractWe consider a model in which the ultra-relativistic jet in a gamma-ray burst (GRB) is cold and magnetically accelerated. We assume that the energy flux in the outflowing material is partially thermalized via internal shocks or a reverse shock, and we estimate the maximum amount of radiation that could be produced in such magnetized shocks. We compare this estimate with the available observational data on prompt γ-ray emission in GRBs. We find that, even with highly optimistic assumptions, the magnetized jet model is radiatively too inefficient to be consistent with observations. One way out is to assume that much of the magnetic energy in the post-shock, or even pre-shock, jet material is converted to particle thermal energy by some unspecified process, and then radiated. This can increase the radiative efficiency sufficiently to fit observations. Alternatively, jet acceleration may be driven by thermal pressure rather than magnetic fields. In this case, which corresponds to the traditional fireball model, sufficient prompt GRB emission could be produced either from shocks at a large radius or from the jet photosphere closer to the center.en_US
dc.description.sponsorshipAstronomyen_US
dc.language.isoen_USen_US
dc.publisherOxford University Press (OUP)en_US
dc.relation.isversionofdoi:10.1111/j.1365-2966.2011.19197.xen_US
dc.relation.hasversionhttps://arxiv.org/abs/1105.0003en_US
dash.licenseOAP
dc.subjectacceleration of particlesen_US
dc.subjectMHDen_US
dc.subjectradiation mechanisms: non-thermalen_US
dc.subjectrelativistic processesen_US
dc.subjectshock wavesen_US
dc.subjectgamma-ray burst: generalen_US
dc.titleConstraints on cold magnetized shocks in gamma-ray burstsen_US
dc.typeJournal Articleen_US
dc.description.versionAccepted Manuscripten_US
dc.relation.journalMonthly Notices of the Royal Astronomical Societyen_US
dash.depositing.authorNarayan, Ramesh
dc.date.available2016-08-04T20:19:22Z
dc.identifier.doi10.1111/j.1365-2966.2011.19197.x*
dash.contributor.affiliatedNarayan, Ramesh


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record