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High-energy neutrino and gamma-ray transients from trans-relativistic supernova shock breakouts
Kazumi Kashiyama, Kohta Murase, Shunsaku Horiuchi +2
Relativistic shocks that accompany supernovae (SNe) produce X-ray burst emissions as they break out in the dense circumstellar medium around the progenitors. This phenomenon is som…
Galaxy Clusters as Reservoirs of Heavy Dark Matter and High-Energy Cosmic Rays: Constraints from Neutrino Observations
Kohta Murase, John F. Beacom
Galaxy Clusters (GCs) are the largest reservoirs of both dark matter and cosmic rays (CRs). Dark matter self-annihilation can lead to a high luminosity in gamma rays and neutrinos,…
Gamma-Ray and Neutrino Backgrounds as Probes of the High-Energy Universe: Hints of Cascades, General Constraints, and Implications for TeV Searches
Kohta Murase, John F. Beacom, Hajime Takami
Recent observations of isotropic diffuse backgrounds by Fermi and IceCube allow us to get more insight into distant very-high-energy (VHE) and ultra-high-energy (UHE) gamma-ray/neu…
IceCube Non-detection of GRBs: Constraints on the Fireball Properties
Hao-Ning He, Ruo-Yu Liu, Xiang-Yu Wang +3
The increasingly deep limit on the neutrino emission from gamma-ray bursts (GRBs) with IceCube observations has reached the level that could put useful constraints on the fireball…
Variable Gamma-ray Emission Induced by Ultra-High Energy Neutral Beams: Application to 4C +21.35
Charles D. Dermer, Kohta Murase, Hajime Takami
The flat spectrum radio quasar (FSRQ) 4C +21.35 (PKS 1222+216) displays prominent nuclear infrared emission from ~1200 K dust. A 70 -- 400 GeV flare with ~10 min variations during…
The survival of nuclei in jets associated with core-collapse supernovae
Shunsaku Horiuchi, Kohta Murase, Kunihito Ioka +1
Heavy nuclei such as nickel-56 are synthesized in a wide range of core-collapse supernovae (CCSN), including energetic supernovae associated with gamma-ray bursts (GRBs). Recent st…