Zobrazeno 1 - 10
of 316
pro vyhledávání: '"Kohta, Murase"'
Publikováno v:
The Astrophysical Journal Letters, Vol 961, Iss 2, p L34 (2024)
Recent observations of high-energy neutrinos by IceCube and gamma rays by the Fermi Large Area Telescope (LAT) and the MAGIC telescope have suggested that neutrinos are produced in gamma-ray opaque environments in the vicinity of supermassive black h
Externí odkaz:
https://doaj.org/article/7c88a3195af741b7a5a21bcd3e09dea5
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 162 (2024)
AT 2022cmc is a recently documented tidal disruption event that exhibits a luminous jet, accompanied by fast-declining X-ray and long-lasting radio and millimeter emission. Motivated by the distinct spectral and temporal signatures between the X-ray
Externí odkaz:
https://doaj.org/article/b9cee90c43ee429998e14a16a4e3f0fd
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 44 (2024)
The detection of high-energy neutrino signals from the nearby Seyfert galaxy NGC 1068 provides us with an opportunity to study nonthermal processes near the center of supermassive black holes. Using the IceCube and latest Fermi-LAT data, we present g
Externí odkaz:
https://doaj.org/article/c14897af8b714d19a33fb7d3d9061f6c
Autor:
Ke Fang, Kohta Murase
Publikováno v:
The Astrophysical Journal Letters, Vol 957, Iss 1, p L6 (2023)
High-energy neutrino and γ -ray emission has been observed from the Galactic plane, which may come from individual sources and/or diffuse cosmic rays. We evaluate the contribution of these two components through the multimessenger connection between
Externí odkaz:
https://doaj.org/article/5003279a294c448981615edb3b7173c5
Detecting High-energy Neutrino Minibursts from Local Supernovae with Multiple Neutrino Observatories
Autor:
Ali Kheirandish, Kohta Murase
Publikováno v:
The Astrophysical Journal Letters, Vol 956, Iss 1, p L8 (2023)
Growing evidence from multiwavelength observations of extragalactic supernovae (SNe) has established the presence of dense circumstellar material in Type II SNe. Interaction between the SN ejecta and the circumstellar material should lead to diffusiv
Externí odkaz:
https://doaj.org/article/9c9403e0cf9f4bafa52467e2ec6b7b9a
Publikováno v:
The Astrophysical Journal Letters, Vol 954, Iss 2, p L49 (2023)
The recent detection of high-energy neutrinos by IceCube in the direction of the nearby Seyfert/starburst galaxy NGC 1068 implies that radio-quiet active galactic nuclei can accelerate cosmic-ray ions. Dedicated multimessenger analyses suggest that t
Externí odkaz:
https://doaj.org/article/f471c07cb7d545689a2a90b6c37bc34b
Publikováno v:
The Astrophysical Journal Letters, Vol 947, Iss 1, p L14 (2023)
The detection of the hyper-bright gamma-ray burst (GRB) 221009A enables us to explore the nature of the GRB emission and the origin of very high-energy gamma rays. We analyze the Fermi Large Area Telescope (Fermi-LAT) data of this burst and investiga
Externí odkaz:
https://doaj.org/article/53bf006cd7674fb882ca563c3b12e2d4
Publikováno v:
Nature Communications, Vol 12, Iss 1, Pp 1-11 (2021)
The origins of the soft gamma-ray and high-energy neutrino backgrounds remain unknown. Here, the authors show radiatively inefficient accretion flows of low-luminosity active galactic nuclei can produce the soft gamma ray and high energy neutrino bac
Externí odkaz:
https://doaj.org/article/4cedad3099ac4b3fa1b6b641cb29f4db
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 188 (2023)
A fraction of merging galaxy clusters host diffuse radio emission in their central region, termed a giant radio halo (GRH). The most promising mechanism of GRHs is the reacceleration of nonthermal electrons and positrons by merger-induced turbulence.
Externí odkaz:
https://doaj.org/article/fe14c358c2e14807810f2a772d31be8c
Publikováno v:
The Astrophysical Journal, Vol 954, Iss 2, p 194 (2023)
Gamma-ray flares of blazars may be accompanied by high-energy neutrinos due to interactions of high-energy cosmic rays in the jet with photons, as suggested by the detection of the high-energy neutrino IceCube-170922A during a major gamma-ray flare f
Externí odkaz:
https://doaj.org/article/54b8d98fb26e4b0e966b23510109fbc8