Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
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
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
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 in 2002 by Ray Protheroe. Post-print sourced from
DOI: 10.1016/S0927-6505(01)00124-4
Description (link):
Published version:
Appears in Collections:Aurora harvest 7
Physics publications

Files in This Item:
File Description SizeFormat 
hdl_12408.pdf268.41 kBPublisher's post-printView/Open

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