Pitch-angle diffusion and Bohm-type approximations in diffusive shock acceleration

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dc.contributor.author Riordan, John Daniel
dc.contributor.author Pe’er, Asaf
dc.date.accessioned 2019-04-10T11:46:22Z
dc.date.available 2019-04-10T11:46:22Z
dc.date.issued 2019-02-27
dc.identifier.citation Riordan, J. D. and Pe’er, A. (2019) ‘Pitch-angle diffusion and Bohm-type approximations in diffusive shock acceleration’, Astrophysical Journal, 873(1), 13 (12pp). doi: 10.3847/1538-4357/aaffd2 en
dc.identifier.volume 873 en
dc.identifier.issued 1 en
dc.identifier.startpage 1 en
dc.identifier.endpage 12 en
dc.identifier.issn 0004-637X
dc.identifier.uri http://hdl.handle.net/10468/7742
dc.identifier.doi 10.3847/1538-4357/aaffd2 en
dc.description.abstract The problem of accelerating cosmic rays is one of fundamental importance, particularly given the uncertainty in the conditions inside the acceleration sites. Here we examine diffusive shock acceleration in arbitrary turbulent magnetic fields, constructing a new model that is capable of bridging the gap between the very weak (δB/B 0 Lt 1) and the strong turbulence regimes. To describe the diffusion we provide a quantitative analytical description of the "Bohm exponent" in each regime. We show that our results converge to the well known quasi-linear theory in the weak turbulence regime. In the strong regime, we quantify the limitations of the Bohm-type models. Furthermore, our results account for the anomalous diffusive behavior which has been noted previously. Finally, we discuss the implications of our model in the study of possible acceleration sites in different astronomical objects. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher IOP Publishing on behalf of the American Astronomical Society en
dc.relation.uri https://iopscience.iop.org/article/10.3847/1538-4357/aaffd2/meta
dc.rights © 2019, American Astronomical Society. All rights reserved. en
dc.subject Acceleration of particles en
dc.subject Cosmic rays en
dc.subject Methods: numerical en
dc.subject Scattering en
dc.subject Turbulence en
dc.title Pitch-angle diffusion and Bohm-type approximations in diffusive shock acceleration en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Asaf Pe’er, Physics, University College Cork, Cork, Ireland. T: +353-21-490-3000 E: a.peer@ucc.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Seventh Framework Programme en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Astrophysical Journal en
dc.internal.IRISemailaddress a.peer@ucc.ie en
dc.identifier.articleid 13 en
dc.relation.project info:eu-repo/grantAgreement/EC/FP7::SP3::PEOPLE/618499/EU/Transient-Sky/TRANSIENT-SKY en
dc.identifier.eissn 1538-4357

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