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4 years ago
Title: Ultrahigh-energy photons up to 1.4 petaelectronvolts from 12 γ-ray Galactic sources
Link: https://www.nature.com/articles/s41586-021-03498-z
Description: The extension of the cosmic-ray spectrum beyond 1 petaelectronvolt (PeV; 1015 electronvolts) indicates the existence of the so-called PeVatrons—cosmic-ray factories that accelerate particles to PeV energies. We need to locate and identify such objects to find the origin of Galactic cosmic rays1. The principal signature of both electron and proton PeVatrons is ultrahigh-energy (exceeding 100 TeV) γ radiation. Evidence of the presence of a proton PeVatron has been found in the Galactic Centre, according to the detection of a hard-spectrum radiation extending to 0.04 PeV (ref. 2). Although γ-rays with energies slightly higher than 0.1 PeV have been reported from a few objects in the Galactic plane3,4,5,6, unbiased identification and in-depth exploration of PeVatrons requires detection of γ-rays with energies well above 0.1 PeV. Here we report the detection of more than 530 photons at energies above 100 teraelectronvolts and up to 1.4 PeV from 12 ultrahigh-energy γ-ray sources with a stati
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4 years ago
Title: Semi-analytical model of extensive air showers using branching processes
Link: https://doi.org/10.1016/j.astropartphys.2021.102585
Description:
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4 years ago
Title: First detection of sub-PeV diffuse gamma rays from the Galactic disk
Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.141101
Description:
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4 years ago
Title: First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
Link: https://iopscience.iop.org/article/10.3847/2041-8213/abe4de
Description:
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4 years ago
Title: First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
Link: https://iopscience.iop.org/article/10.3847/2041-8213/abe71d
Description:
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4 years ago
Title: Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer
Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.041104
Description:
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