20 citations · 32 across the 9 of their papers we have counts for
9 papers
Unravelling Turbulence and Magnetic Fields in Galaxy Clusters with SKA and XRISM
Kohei Kurahara, Takuya Akahori, Amit Seta +5
This chapter proposes a research framework to quantitatively investigate non-thermal components in the Intracluster Medium (ICM) of galaxy clusters, which are critical ingredients…
Cosmological simulation of a radio synchrotron bridge between pre-merging galaxy clusters
Kosuke Nishiwaki, Gianfranco Brunetti, Franco Vazza +1
Radio bridges are diffuse synchrotron emission observed between merging galaxy clusters. Recent radio observations have reported both detections and non-detections of radio bridges…
Hadronic origin of the very high-energy gamma-ray emission from the low-luminosity AGN in NGC 4278
Asahi Shoji, Yutaka Fujita, Norita Kawanaka +2
The Large High Altitude Air Shower Observatory has detected very high-energy (VHE) gamma rays from NGC 4278, which is known to host a low-luminosity active galactic nucleus (AGN).…
Low injection rate of cosmic-ray protons in the turbulent reacceleration model of radio halos in galaxy clusters
Kosuke Nishiwaki, Katsuaki Asano
A giant radio halo (RH) is a diffuse synchrotron emission observed on the scale of megaparsecs (Mpc), typically found in the central region of merging galaxy clusters. Its large si…
Efficiency of turbulent reacceleration by solenoidal turbulence and its application to the origin of radio mega halos in cluster outskirts
Kosuke Nishiwaki, Gianfranco Brunetti, Franco Vazza +1
Recent radio observations with Low-Frequency Array (LOFAR) discovered diffuse emission extending beyond the scale of classical radio halos. The presence of such mega halos indicate…
High-energy neutrino constraints on cosmic-ray re-acceleration in radio halos of massive galaxy clusters
Kosuke Nishiwaki, Katsuaki Asano, Kohta Murase
A fraction of merging galaxy clusters host diffuse radio emission in their central region, termed as a giant radio halo (GRH). The most promising mechanism of GRHs is the re-accele…
Non-thermal emissions from a head-tail radio galaxy in 3D magnetohydrodynamic simulations
Takumi Ohmura, Katsuaki Asano, Kosuke Nishiwaki +2
We present magnetohydrodynamic simulations of a jet-wind interaction in a galaxy cluster and the radio to gamma-ray and the neutrino emissions from this "head-tail galaxy". Our sim…
Statistical Properties of Radio Halos in Galaxy Clusters and Origin of Seed Electrons for Reacceleration
Kosuke Nishiwaki, Katsuaki Asano
One of the most promising mechanisms for producing radio halos (RHs) in galaxy clusters is the reacceleration of cosmic-ray electrons by turbulences. However, the origin of the see…
Particle Reacceleration by Turbulence and Radio Constraints on Multi-Messenger High-Energy Emission from the Coma Cluster
Kosuke Nishiwaki, Katsuaki Asano, Kohta Murase
Galaxy clusters are considered to be gigantic reservoirs of cosmic rays (CRs). Some of the clusters are found with extended radio emission, which provides evidence for the existenc…