Distortion of Ultra-high-energy sky by Galactic Magnetic Field

Abstract

We investigate the deflections of UHE protons by Galactic magnetic field(GMF) using four conventional GMF models in order to discuss the positional correlation between the arrival distribution of UHECRs and their sources. UHE protons coming from the direction around the Galactic center are highly deflected above $8^{\circ }$ by the dipole magnetic field during their propagation in Galactic space. However, in bisymmetric spiral field models, there are directions with the deflection angle below $1^{\circ }$. One of these directions is toward Centaurus A, the nearest radio-loud active galactic nuclei that is one of possible candidates of UHECR sources. On the other hand, UHE protons arriving from the direction of the anti-Galactic center are less deflected, especially in bisymmetric spiral field models. Thus, the northern hemisphere, not including the Galactic center, is suitable for the studies of correlation with sources. The dependence on model parameters is also investigated. The deflection angles of UHE protons are dependent on the pitch angle of the spiral field. We also investigate distortion of the supergalactic plane by GMF. Since the distortion in the direction around Galactic center strongly depends on the GMF model, we can obtain information on GMF around Galactic center if Pierre Auger Observatory finds the significant positional correlation around the supergalactic plane.

9 pages, 6 figures, submitted to ApJ

References in corpus (3)

• Towards unravelling the structural distribution of ultra-high-energy cosmic ray sources
• Estimation Prospects of the Source Number Density of Ultra-high-energy Cosmic Rays
• Astrophysical interpretation of the medium scale clustering in the ultra-high energy sky

Cited by in corpus (6)

• Simulations of ultra-high Energy Cosmic Rays in the local Universe and the origin of Cosmic Magnetic Fields
• Propagation of UHE Protons through Magnetized Cosmic Web
• Cross-Correlation between UHECR Arrival Distribution and Large-Scale Structure
• Implications to Sources of Ultra-high-energy Cosmic Rays from their Arrival Distribution
• The Centaurus A Ultrahigh-Energy Cosmic Ray Excess and the Local Extragalactic Magnetic Field
• Filaments of Galaxies as a Clue to the Origin of Ultra-High-Energy Cosmic Rays