LiBeB, Cosmic Rays, and Gamma‐Ray Line Astronomy
نویسندگان
چکیده
منابع مشابه
LiBeB and the Origin of the Cosmic Rays
Be abundances at low metallicities have major implications on cosmic ray origin, requiring acceleration out of fresh supernova ejecta. The observed, essentially constant Be/Fe fixes the Be production per SNII, allowing the determination of the energy supplied to cosmic rays per SNII. The results rule out acceleration out of the metal-poor ISM, and favor Be production at all epochs of Galactic e...
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Although cosmic rays were discovered a century ago, we do not know where or how they are accelerated. There is a realistic hope that the oldest problem in astronomy will be solved soon by ambitious experimentation: air shower arrays of 10,000 kilometer-square area, arrays of air Cerenkov telescopes and kilometer-scale neutrino observatories. Their predecessors are producing science. We will rev...
متن کاملGamma Ray Astronomy and the Origin of Galactic Cosmic Rays
Diffusive shock acceleration operating at expanding supernova remnant shells is by far the most popular model for the origin of galactic cosmic rays. Despite the general consensus received by this model, an unambiguous and conclusive proof of the supernova remnant hypothesis is still missing. In this context, the recent developments in gamma ray astronomy provide us with precious insights into ...
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The origin of Galactic cosmic rays is still a burning question that forms a major motivation for developments in ground-based gamma-ray astronomy. SNRs are long-thought to be sites for the acceleration of Galactic cosmic rays, and evidence for gamma-ray and non-thermal X-ray production from some SNRs suggest that they may be capable of accelerating particles to multi-TeV energies. Yet, along wi...
متن کاملLibeb Energetics and Cosmic Ray Origin
Three different models have been proposed for LiBeB production by cosmic rays: the CRI model in which the cosmic rays are accelerated out of an ISM of solar composition scaled with metallicity; the CRS model in which cosmic rays with composition similar to that of the current epoch cosmic rays are accelerated out of fresh supernova ejecta; and the LECR model in which a distinct low energy compo...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1999
ISSN: 0004-6280,1538-3873
DOI: 10.1086/316355