The Galactic Magnetic Field and Ultrahigh-Energy Cosmic Ray Deflections

Abstract

Our understanding of the Galactic magnetic field (GMF) has increased considerably in recent years, while at the same time remaining far from adequate. By way of illustration, the Jansson and Farrar (2012) (JF12) GMF model is described, emphasizing how it is constrained and which features are robust or likely to change, as modelling and constraining data improve. The most urgent requirements for the next phase of modelling are a more realistic model for the relativistic electron distribution (in order to reduce the systematic error associated with interpreting synchrotron data) and a better theoretical understanding of the origin of the large-scale coherent field (in order to develop a better phenomenological parameterization of the field). Even in its current stage of development, the JF12 model allows some important conclusions about UHECR deflections in the GMF to be formulated.

Invited chapter in a volume devoted to ultrahigh energy cosmic rays, of Comptes Rendus Physique XX (2014), ed. A. Letessier-Selvon.; 11 pages, 10 figures

References in corpus (6)

• Radio observational constraints on Galactic 3D-emission models
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• Rotation Measures of Extragalactic Sources Behind the Southern Galactic Plane: New Insights into the Large-Scale Magnetic Field of the Inner Milky Way
• Antisymmetry in the Faraday Rotation Sky Caused by a Nearby Magnetized Bubble
• Galactic Dynamos and Galactic Winds
• Magnetic fields and star formation in spiral galaxies

Cited by in corpus (12)

• Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8\times 10^{18}$ eV
• Features of the energy spectrum of cosmic rays above $2.5\times 10^{18}$ eV using the Pierre Auger Observatory
• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• The Coherent Magnetic Field of the Milky Way
• The Imprint of Large Scale Structure on the Ultra-High-Energy Cosmic Ray Sky
• Magnetic Deflections of Ultra-High Energy Cosmic Rays from Centaurus A
• The Nuclear Window to the Extragalactic Universe
• Progress in the Global Modeling of the Galactic Magnetic Field
• Constraints on UHECR sources and extragalactic magnetic fields from directional anisotropies
• Search for magnetically-induced signatures in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory
• Galactic halo bubble magnetic fields and UHECR deflections
• Modification of the Dipole in Arrival Directions of Ultra-high-energy Cosmic Rays due to the Galactic Magnetic Field