scholarly journals Cosmic-ray transport and gamma-ray emission in M31

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Audrey Do ◽  
Matthew Duong ◽  
Alex McDaniel ◽  
Collin O’Connor ◽  
Stefano Profumo ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Ray Emission

scholarly journals EDGE: a code to calculate diffusion of cosmic-ray electrons and their gamma-ray emission

2017 ◽  
Author(s):  
Ruben Lopez-Coto ◽  
Joachim Hahn ◽  
Jim Hinton ◽  
Robert D. Parsons ◽  
Francisco Salesa Greus ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Ray Emission

scholarly journals SEARCH FOR COSMIC-RAY-INDUCED GAMMA-RAY EMISSION IN GALAXY CLUSTERS

2014 ◽  
Vol 787 (1) ◽  
pp. 18 ◽  
Author(s):  
M. Ackermann ◽  
M. Ajello ◽  
A. Albert ◽  
A. Allafort ◽  
W. B. Atwood ◽  
...  
Keyword(s):  
Galaxy Clusters ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Gamma Ray Emission

scholarly journals Supernova remnants and the origin of cosmic rays

2013 ◽  
Vol 9 (S296) ◽  
pp. 305-314
Author(s):  
Jacco Vink
Keyword(s):  
Synchrotron Radiation ◽  
Cosmic Rays ◽  
Magnetic Fields ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Galactic Cosmic Rays ◽  
Long Time ◽  
Gamma Ray Emission

AbstractSupernova remnants have long been considered to be the dominant sources of Galactic cosmic rays. For a long time the prime evidence consisted of radio synchrotron radiation from supernova remnants, indicating the presence of electrons with energies of several GeV. However, in order to explain the cosmic ray energy density and spectrum in the Galaxy supernova remnant should use 10% of the explosion energy to accelerate particles, and about 99% of the accelerated particles should be protons and other atomic nuclei.Over the last decade a lot of progress has been made in providing evidence that supernova remnant can accelerate protons to very high energies. The evidence consists of, among others, X-ray synchrotron radiation from narrow regions close to supernova remnant shock fronts, indicating the presence of 10-100 TeV electrons, and providing evidence for amplified magnetic fields, gamma-ray emission from both young and mature supernova remnants. The high magnetic fields indicate that the condition for accelerating protons to >1015 eV are there, whereas the gamma-ray emission from some mature remnants indicate that protons have been accelerated.

scholarly journals MODELING THE GAMMA-RAY EMISSION IN THE GALACTIC CENTER WITH A FADING COSMIC-RAY ACCELERATOR

2016 ◽  
Vol 833 (2) ◽  
pp. 200 ◽  
Author(s):  
Ruo-Yu Liu ◽  
Xiang-Yu Wang ◽  
Anton Prosekin ◽  
Xiao-Chuan Chang
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Cosmic Ray ◽  
Gamma Ray Emission

scholarly journals Ultrahigh-energy diffuse gamma-ray emission from cosmic-ray interactions with the medium surrounding acceleration sources

2022 ◽  
Vol 105 (2) ◽  
Author(s):  
Pei-pei Zhang ◽  
Bing-qiang Qiao ◽  
Qiang Yuan ◽  
Shu-wang Cui ◽  
Yi-qing Guo
Keyword(s):  
Gamma Ray ◽  
Cosmic Ray ◽  
Ultrahigh Energy ◽  
Cosmic Ray Interactions ◽  
Gamma Ray Emission

scholarly journals Magnetic reconnection, Cosmic Ray Acceleration and Gamma-Ray emission around Black Holes and Relativistic Jets

2019 ◽  
Author(s):  
Elisabete De Gouveia Dal Pino ◽  
Rafael Alves Batista ◽  
Luis H.S. Kadowaki ◽  
Grzergorz Kowal ◽  
Tania E. Medina-Torrejon ◽  
...  
Keyword(s):  
Black Holes ◽  
Magnetic Reconnection ◽  
Gamma Ray ◽  
Cosmic Ray ◽  
Relativistic Jets ◽  
Cosmic Ray Acceleration ◽  
Gamma Ray Emission

scholarly journals Fermi Large Area Telescope observation of high-energy solar flares: constraining emission scenarios

2015 ◽  
Vol 11 (S320) ◽  
pp. 51-56
Author(s):  
Nicola Omodei ◽  
Melissa Pesce-Rollins ◽  
Vahè Petrosian ◽  
Wei Liu ◽  
Fatima Rubio da Costa ◽  
...  
Keyword(s):  
Solar Flares ◽  
Gamma Ray ◽  
Solar Energetic Particle ◽  
Cosmic Ray ◽  
Impulsive Phase ◽  
High Energy ◽  
Solar Energetic Particle Event ◽  
Emission Scenarios ◽  
Large Area ◽  
Gamma Ray Emission

AbstractThe Fermi Large Area Telescope (LAT) is the most sensitive instrument ever deployed in space for observing gamma-ray emission >100 MeV. This has also been demonstrated by its detection of quiescent gamma-ray emission from pions produced by cosmic-ray protons interacting in the solar atmosphere, and from cosmic-ray electron interactions with solar optical photons. The Fermi-LAT has also detected high-energy gamma-ray emission associated with GOES M-class and X-class solar flares, each accompanied by a coronal mass ejection and a solar energetic particle event, increasing the number of detected solar flares by almost a factor of 10 with respect to previous space observations. During the impulsive phase, gamma rays with energies up to several hundreds of MeV have been recorded by the LAT. Emission up to GeV energies lasting several hours after the flare has also been detected by the LAT. Of particular interest are the recent detections of three solar flares whose position behind the limb was confirmed by the STEREO satellites. While gamma-ray emission up to tens of MeV resulting from proton interactions has been detected before from occulted solar flares, the significance of these particular events lies in the fact that these are the first detections of >100 MeV gamma-ray emission from footpoint-occulted flares. We will present the Fermi-LAT, RHESSI and STEREO observations of these flares and discuss the various emission scenarios for these sources.

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