Results 11 to 20 of about 4,193,433 (326)

Role of line-of-sight cosmic ray interactions in forming the spectra of distant blazars in TeV gamma rays and high-energy neutrinos [PDF]

open access: yes, 2011
Active galactic nuclei (AGN) can produce both gamma rays and cosmic rays. The observed high-energy gamma-ray signals from distant blazars may be dominated by secondary gamma rays produced along the line of sight by the interactions of cosmic-ray protons ...
Beacom, John F.   +3 more
core   +2 more sources

First Detection of sub-PeV Diffuse Gamma Rays from the Galactic Disk: Evidence for Ubiquitous Galactic Cosmic Rays beyond PeV Energies. [PDF]

open access: yesPhysical Review Letters, 2021
We report, for the first time, the long-awaited detection of diffuse gamma rays with energies between 100 TeV and 1 PeV in the Galactic disk. Particularly, all gamma rays above 398 TeV are observed apart from known TeV gamma-ray sources and compatible ...
M. Amenomori   +94 more
semanticscholar   +1 more source

Early Gamma-Ray Afterglow from Gamma-Ray Bursts [PDF]

open access: goldProceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), 2023
Katsuaki Asano
openalex   +2 more sources

Very high-energy gamma-ray emission beyond 10 TeV from GRB 221009A [PDF]

open access: yesScience Advances, 2023
The highest-energy gamma-rays from gamma-ray bursts (GRBs) have important implications for their radiation mechanism. Here we report the detection of gamma-rays up to 13 teraelectronvolts from the brightest GRB 221009A by the Large High Altitude Air ...
Z. Cao   +278 more
semanticscholar   +1 more source

Gamma-Ray Bursts [PDF]

open access: yesScience, 2012
Stellar Explosions Stars that are born with masses greater than eight times that of the Sun end their lives in luminous explosions known as supernovae. Over the past decade, access to improved sky surveys has revealed rare types of supernovae that are much more luminous than any of those that were known before.
Gehrels, Neil, Meszaros, Peter
openaire   +3 more sources

Peta–electron volt gamma-ray emission from the Crab Nebula [PDF]

open access: yesScience, 2021
High-energy photons from the Crab Nebula The Crab Nebula contains a pulsar that excites the surrounding gas to emit high-energy radiation. The combination of the pulsar's youth and nearby location makes the nebula the brightest gamma-ray source in the ...
Z. Cao   +270 more
semanticscholar   +1 more source

Precision imaging of 4.4 MeV gamma rays using a 3-D position sensitive Compton camera [PDF]

open access: yesScientific Reports, 2018
Imaging of nuclear gamma-ray lines in the 1–10 MeV range is far from being established in both medical and physical applications. In proton therapy, 4.4 MeV gamma rays are emitted from the excited nucleus of either 12C* or 11B* and are considered good ...
A. Koide   +10 more
semanticscholar   +1 more source

Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow. [PDF]

open access: yesScience, 2021
Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events.
H. Abdalla   +237 more
semanticscholar   +1 more source

Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A [PDF]

open access: yes, 2017
On 2017 August 17, the gravitational-wave event GW170817 was observed by the Advanced LIGO and Virgo detectors, and the gamma-ray burst (GRB) GRB 170817A was observed independently by the Fermi Gamma-ray Burst Monitor, and the Anticoincidence Shield for ...
B. Abbott   +499 more
semanticscholar   +1 more source

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