Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/4553
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSigl, G-
dc.contributor.authorSchramm, D. N-
dc.contributor.authorBhattacharjee, P-
dc.date.accessioned2009-06-16T16:16:51Z-
dc.date.available2009-06-16T16:16:51Z-
dc.date.issued1994-09-
dc.identifier.citationAstroparticle Physics, Vol. 2, No. 4, pp. 401 - 414en
dc.identifier.issn0927-6505-
dc.identifier.urihttp://hdl.handle.net/2248/4553-
dc.description.abstractIn this paper we show that the conventional diffusive shock acceleration mechanism for cosmic rays associated with relativistic astrophysical shocks in active galactic nuclei (AGNs) has severe difficulties to explain the highest energy cosmic ray events. We show that protons above around 2 x 10/sup20 eV could have marginally been produced by this mechanism in an AGN or a rich galaxy cluster not further away than around 100 Mpc. However, for the highest energy Fly's Eye and Yakutsk events this is inconsistent with the observed arrival directions. Galactic and intergalactic magnetic fields appear unable to alter the direction of such energetic particles by more than a few degrees. We also discuss some other options for these events associated with relativistic particles including pulsar acceleration of high nuclei. At the present stage of knowledge the concept of topological defects left over from the early universe as the source for such events appears to be a promising option. Such sources are discussed and possible tests of this hypothesis are proposed.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urihttp://arxiv.org/abs/astro-ph/9403039en
dc.relation.urihttp://dx.doi.org/10.1016/0927-6505(94)90029-9en
dc.rights© Elsevieren
dc.subjectActive Galactic Nucleien
dc.subjectCosmic Raysen
dc.subjectGalactic Clustersen
dc.subjectParticle Accelerationen
dc.subjectProtonsen
dc.subjectPulsarsen
dc.subjectRelativistic Particlesen
dc.subjectShock Wave Propagationen
dc.subjectDiffusivityen
dc.subjectInterplanetary Magnetic Fieldsen
dc.titleOn the origin of highest energy cosmic raysen
dc.typeArticleen
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
On the origin of highest energy cosmic rays217 kBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.