Studying the distribution and the origin of Galactic cosmic rays by meter wavelength radio observation

Abstract

The origin, propagation and distribution of Galactic cosmic rays is one of the important fields of cosmic ray study even after more than 100 years since its discovery. Although great progress has been made, It is still far from the final answer. In recent years, joint observations of radio, optical, X-ray and γ -ray play an important role in understanding the Galactic cosmic rays. These observations provide a lot of evidences supporting that Galactic cosmic rays are mainly accelerated in the shock of supernova remnant through the mechanism of diffusive shock acceleration. Our knowledge about the distribu-tion and composition of Galactic cosmic rays is also improved by analyzing the high sensitivity diffuse γ -ray data of Fermi . Meterwave radio observation may promote the studies of Galactic cosmic rays distribution, propagation (absorption obser-vation of HII and planetary nebulae, high sensitivity and resolution meter wavelength sky survey) and origin (observation of supernova remnants shock region, scintillation and scattering observation of extragalactic point sources and pulsars, searching the lower energy counterparts of TeV γ -ray sources).