Results 1 to 10 of about 1,321 (200)
Evolved Pulsar Wind Nebulae [PDF]
Universe, 2023 Based on the expected population of core collapse supernova remnants and the huge number of detected pulsars in the Galaxy, still representing only a fraction of the real population, pulsar wind nebulae are likely to constitute one of the largest classes
Barbara Olmi
doaj +4 more sources
Proton Acceleration with Relativistic Electromagnetic Shock. [PDF]
Adv Sci (Weinh)New Ion Acceleration Mechanism! A novel cosmic‐ray proton acceleration mechanism is proposed, where relativistic electromagnetic shocks accelerate protons transversely. Hamiltonian analysis yields a scaling law linking the proton energy to the minimum longitudinal thickness of the shock.
Xiao T +5 more
europepmc +2 more sources
Pulsar Wind Nebulae and Unidentified Galactic Very High Energy Sources [PDF]
J, 2022 The riddle of the origin of Cosmic Rays (CR) has been an open question for over a century. Gamma ray observations above 100 MeV reveal the sites of cosmic ray acceleration to energies where they are unaffected by solar modulation; recent evidence ...
Omar Tibolla +2 more
doaj +2 more sources
GeV Gamma-Ray Emission from Pulsar Wind Nebula HESS J1356-645 with Fermi-Large Area Telescope
The Astrophysical Journal, 2023 HESS J1356-645 is considered to be a pulsar wind nebula (PWN) associated with the pulsar PSR J1357-6429. We reanalyze the GeV gamma-ray emission in the direction of HESS J1356-645 with more than 13 yr of Fermi-Large Area Telescope data.
Xi Liu +4 more
doaj +1 more source
Why (Still) Studying Turbulence in Fluids and Plasmas?
Perspectives of Earth and Space Scientists, Volume 4, Issue 1, December 2023., 2023 Abstract Turbulence, a captivating and intricate phenomenon, continues to attract researchers across diverse scientific disciplines. Despite considerable efforts, turbulence remains a fascinating challenge and stands as one of the unsolved enigmas in classical physics.
Tommaso Alberti +2 more
wiley +1 more source
Gamma-ray pulsar halos in the Galaxy
Frontiers in Astronomy and Space Sciences, 2022 Pulsar halos are extended gamma-ray structures generated by electrons and positrons escaping from pulsar wind nebulae (PWNe), considered a new class of gamma-ray sources.
Kun Fang
doaj +1 more source
Journal of Geophysical Research: Space Physics, Volume 128, Issue 2, February 2023., 2023 Abstract We present long‐term density trends of the Earth's upper atmosphere at altitudes between 71 and 116 km, based on atmospheric occultations of the Crab Nebula observed with X‐ray astronomy satellites, ASCA, RXTE, Suzaku, NuSTAR, and Hitomi. The combination of the five satellites provides a time period of 28 years from 1994 to 2022.
Satoru Katsuda +11 more
wiley +1 more source
A search for runaway stars in 12 Galactic supernova remnants
Astronomische Nachrichten, Volume 342, Issue 3, Page 553-577, March 2021., 2021 Runaway stars can result from core‐collapse supernovae in multiple stellar systems. If the supernova disrupts the system, the companion is ejected with its former orbital velocity. A clear identification of a runaway star can yield the time and place of the explosion, as well as orbital parameters of the pre‐supernova binary system.
Oliver Lux +3 more
wiley +1 more source
The contribution of Galactic TeV pulsar wind nebulae to Fermi large area telescope diffuse emission
Communications Physics, 2022 Cosmic Rays (CRs) with energy below 1 PeV are believed to originate in the Milky Way, but recent gamma-ray observations by Fermi Large Area Telescope challenge the interpretation of CR diffusion mechanisms across the galaxy.
Vittoria Vecchiotti +2 more
doaj +1 more source
Supernova remnants in nearby galaxies
Astronomische Nachrichten, Volume 341, Issue 2, Page 156-162, February 2020., 2020 Abstract Supernova remnants (SNRs) are the aftermath of stellar explosions, which inject large amounts of energy into the interstellar medium (ISM), carving out new structures and transferring kinetic energy to the ISM. They also act as recycling centers, which return elements processed in stars to the ISM, and cosmic particle accelerators.
Manami Sasaki
wiley +1 more source