Results 311 to 320 of about 220,311 (341)
Galactic Gamma-Ray Sources [PDF]
, 2004 The EGRET telescope has detected over 200 γ-ray sources above 100 MeV, but many remain unidentified because of their poor localization or their faintness at lower energies. Multi-wavelength searches have proved successful at finding interesting blazar and pulsar counterparts at high latitudes, but rarely in the Galactic plane because of confusion. Yet,
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Unidentified Gamma-Ray Sources [PDF]
, 2001 After γ-ray measurements opened a new window to observational astronomy, the question arose as to what kind of objects and which physical processes produce the observed emission. Because the early balloon experiments suffered from inadequate resolution and sky coverage, the first phenomenon associated with unidentified γ-ray-emitting sources was γ-ray ...
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Gamma-ray sources and equipment
1982In 1896 Becquerel discovered that certain of the heavier elements emitted penetrating radiation and were unstable; the earlier concept that elements represented the most stable form of matter had therefore to be abandoned. There are three radioactive series known in nature, the parent elements of which are uranium-238, uranium-235 and thorium-232. Each
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2010
The quiet Sun, the Moon, the Earth and other Solar System objects are sources of high-energy gamma rays. The emission is produced by interactions of Galactic cosmic rays: by nucleons in the surface and atmosphere of the sources via hadronic interactions, and by electrons on solar photons in the heliosphere via inverse Compton scattering. Both emissions
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The quiet Sun, the Moon, the Earth and other Solar System objects are sources of high-energy gamma rays. The emission is produced by interactions of Galactic cosmic rays: by nucleons in the surface and atmosphere of the sources via hadronic interactions, and by electrons on solar photons in the heliosphere via inverse Compton scattering. Both emissions
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2001
The first measurements of high-energy particles following solar flares in space and on the ground were performed during the 1940s, and by the 1960s the experiments were accurate enough to deduce spectral parameters. It was recognized that γ-ray continuum and, most importantly, γ-ray lines should be observable at high altitudes if a sufficiently large ...
Erich Rieger, Gerhard Rank
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The first measurements of high-energy particles following solar flares in space and on the ground were performed during the 1940s, and by the 1960s the experiments were accurate enough to deduce spectral parameters. It was recognized that γ-ray continuum and, most importantly, γ-ray lines should be observable at high altitudes if a sufficiently large ...
Erich Rieger, Gerhard Rank
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Population studies of the gamma-ray sources
AIP Conference Proceedings, 2001We present the status of ongoing modelling of the populations of the EGRET point sources. To analyze the two-dimenstional distribution, we wrote Monte Carlo simulations to produce model populations. We compared models containing an isotropic component and one or two galactic components to the EGRET catalog; preliminary results indicate that while one ...
Sandro Mereghetti +4 more
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Acceleration of particles in Gamma Ray sources: Blazars and Gamma Ray Bursts
AIP Conference Proceedings, 2001The objectives of my talk are to indicate the requirements for particle acceleration for both electrodynamic models and hadronic models in blazars, then to propose a relativistic Fermi acceleration process to achieve the goal of UHE Cosmic Ray production in relativistic flows.
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VHE and UHE Gamma Ray Sources [PDF]
, 1991 The observations of Very High Energy, VHE, and Ultra High Energy, UHE, gamma rays from celestial sources are reviewed. Cerenkov detectors for VHE gamma ray measurements and extended air shower arrays for UHE measurements are described. The x-ray binary pulsar source VHE and UHE observations of Cyg X-3, Her X-1, Vela X-1 and Cen X-3 and of the radio ...
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Gamma Ray Sources and Techniques for Gamma Ray Radiology [PDF]
, 1953 J. J. Hirschfield +2 more
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An overview of real‐world data sources for oncology and considerations for research
Ca-A Cancer Journal for Clinicians, 2022Lynne T Penberthy +2 more
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