5 papers
Electron Firehose Instabilities in High- ICM shocks
Sunjung Kim, Ji-Hoon Ha, Dongsu Ryu +1
The preacceleration of electrons through reflection and shock drift acceleration (SDA) is essential for the diffusive shock acceleration (DSA) of nonthermal electrons in collisionl…
Gamma-ray and Neutrino Emissions due to Cosmic-Ray Protons Accelerated at Intracluster Shocks in Galaxy Clusters
Ji-Hoon Ha, Dongsu Ryu, Hyesung Kang
We examine the cosmic-ray protons (CRp) accelerated at collisionless shocks in galaxy clusters using cosmological structure formation simulations. We find that in the intracluster…
Propagation of ultra-high-energy cosmic rays in the magnetized cosmic web
Jihyun Kim, Dongsu Ryu, Soonyoung Roh +2
A high concentration of ultra-high-energy cosmic ray (UHECR) events, called a hotspot, was reported by the Telescope Array (TA) experiment, but its origin still remains unsolved. O…
A Diffusive Shock Acceleration Model for Protons in Weak Quasi-parallel Intracluster Shocks
Dongsu Ryu, Hyesung Kang, Ji-Hoon Ha
Low sonic Mach number shocks form in the intracluster medium (ICM) during the formation of the large-scale structure of the universe. Nonthermal cosmic-ray (CR) protons are expecte…
Electron Preacceleration in Weak Quasi-perpendicular Shocks in High-beta Intracluster Medium
Hyesung Kang, Dongsu Ryu, Ji-Hoon Ha
Giant radio relics in the outskirts of galaxy clusters are known to be lit up by the relativistic electrons produced via diffusive shock acceleration (DSA) in shocks with low sonic…