Images of very high energy cosmic ray sources in the Galaxy: I. A source towards the Galactic Centre

Abstract

Recent analyses of the anisotropy of cosmic rays at $10^{18}$ eV (the AGASA and SUGAR data) show significant excesses from regions close to the Galactic Centre and Cygnus. Our aim is to check whether such anisotropies can be caused by single sources of charged particles. We investigate propagation of protons in two models of the Galactic regular magnetic field (with the irregular component included) assuming that the particles are injected by a short lived discrete source lying in the direction of the Galactic Centre. We show that apart from a prompt image of the source, the regular magnetic field may cause delayed images at quite large angular distances from the actual source direction. The image is strongly dependent on the time elapsed after ejection of particles and it is also very sensitive to their energy. For the most favourable conditions for particle acceleration by a young pulsar the predicted fluxes are two to four order of magnitudes higher than that observed. The particular numbers depend strongly on the Galactic magnetic field model adopted but it looks that a single pulsar in the Galactic Centre could be responsible for the observed excess.

arXiv comment20 pages, 7 figures, accepted to J. Phys. G

References in corpus (9)

• Ultra-High Energy Cosmic Rays from Young Neutron Star Winds
• Ultra high energy cosmic rays and the large scale structure of the galactic magnetic field
• The Anisotropy of Cosmic Ray Arrival Directions around 10${}^{18}$eV
• The Anisotropy of Cosmic Ray Arrival Direction around 10^18eV
• Southern Hemisphere Observations of a $10^{18}$eV Cosmic Ray Source Near the Direction of the Galactic Centre
• Origin of the highest energy cosmic rays observed
• Magnetic lensing of extremely high energy cosmic rays in a galactic wind
• Production of neutrons, neutrinos and gamma-rays by a very fast pulsar in the Galactic Center region
• Unusual diffuse X-ray source in the Galactic center region

Cited by in corpus (6)

• Astrophysical Origins of Ultrahigh Energy Cosmic Rays
• The AGASA/SUGAR Anisotropies and TeV Gamma Rays from the Galactic Center: A Possible Signature of Extremely High-energy Neutrons
• The last Gamma Ray Burst in our Galaxy? On the observed cosmic ray excess at particle energy 1 EeV
• Cosmic ray drift, the second knee and galactic anisotropies
• Decaying neutron propagation in the Galaxy and the Cosmic Ray anisotropy at 1 EeV
• Ultra high energy cosmic ray sources & experimental results