Galactic gamma-ray bursters - an alternative source of cosmic rays at all energies

Authors
Citation
A. Dar et R. Plaga, Galactic gamma-ray bursters - an alternative source of cosmic rays at all energies, ASTRON ASTR, 349(1), 1999, pp. 259-266
Citations number
83
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
349
Issue
1
Year of publication
1999
Pages
259 - 266
Database
ISI
SICI code
0004-6361(199909)349:1<259:GGB-AA>2.0.ZU;2-4
Abstract
We propose a new hypothesis for the origin of the major part of non-solar h adronic cosmic rays (CRs) at all energies: highly relativistic, narrowly co llimated jets from the birth or collapse of neutron stars (NSs) in our Gala xy accelerate ambient disk and halo matter to CR energies and disperse it i n hot spots which they form when they stop in the Galactic halo. Such event s are seen as cosmological gamma-ray bursts (GRBs) in other galaxies when t heir beamed radiation happens to point towards Earth. This source of CRs is located in the Galactic halo. It therefore explains the absence of the Gre isen-Zatsepin-Kuz'min cutoff in the spectrum of the ultra-high energy CRs. The position in energy of the "ankle" in the CR energy spectrum is shown to arise in a natural way. Moreover, an origin of lower energy CRs in the Gal actic halo naturally accounts for the high degree of isotropy of CRs around 100 TeV from airshower observations, and the small galactocentric gradient of low-energy CRs derived from gamma-ray observations.