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https://hdl.handle.net/2440/12408
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Type: | Journal article |
Title: | Contribution of nuclei accelerated by gamma-ray pulsars to cosmic rays in the Galaxy |
Author: | Bednarek, W. Protheroe, R. |
Citation: | Astroparticle Physics, 2002; 16(4):397-409 |
Publisher: | Elsevier Science BV |
Issue Date: | 2002 |
ISSN: | 0927-6505 |
Statement of Responsibility: | W. Bednarek and R. J. Protheroe |
Abstract: | We consider the galactic population of gamma-ray pulsars as possible sources of cosmic rays at and just above the 'knee' in the observed cosmic ray spectrum at 1015–1016 eV. We suggest that iron nuclei may be accelerated in the outer gaps of pulsars, and then suffer partial photo-disintegration in the non-thermal radiation fields of the outer gaps. As a result, protons, neutrons, and surviving heavier nuclei are injected into the expanding supernova remnant. We compute the spectra of nuclei escaping from supernova remnants into the interstellar medium, taking into account the observed population of radio pulsars. Our calculations, which include a realistic model for acceleration and propagation of nuclei in pulsar magnetospheres and supernova remnants, predict that heavy nuclei accelerated directly by gamma-ray pulsars could contribute about 20% of the observed cosmic rays in the knee region. Such a contribution of heavy nuclei to the cosmic ray spectrum at the knee can significantly increase the average value of lnA with increasing energy as is suggested by recent observations. |
Keywords: | Cosmic rays Spectrum and mass composition Pulsars Cosmic ray acceleration Astrophysics (astro-ph) |
Description: | Copyright © 2002. Astroparticle Physics. All rights reserved. Printed in U.S.A. Submitted to Cornell University’s online archive www.arXiv.org in 2002 by Ray Protheroe. Post-print sourced from www.arxiv.org. |
DOI: | 10.1016/S0927-6505(01)00124-4 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/523319/description#description |
Published version: | http://dx.doi.org/10.1016/s0927-6505(01)00124-4 |
Appears in Collections: | Aurora harvest 7 Physics publications |
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hdl_12408.pdf | 268.41 kB | Publisher's post-print | View/Open |
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