منابع مشابه
Gamma Rays from SN 1987A due to Pseudoscalar Conversion.
A light pseudoscalar coupled to two photons would be copiously emitted by the core of a supernova. Part of this flux would be converted to γ−rays by the galactic magnetic field. Measurements on the SN1987A γ−ray flux by the Gamma-Ray Spectrometer on the Solar Maximum Mission satellite already imply a bound on the coupling g < 3×10 GeV. The improved generation of satellite-borne detectors, like ...
متن کاملCangaroo-iii Search for Gamma Rays from Sn 1987a and the Surrounding Field
Optical images of SN 1987A show a triple ring structure. The inner (dust) ring has recently increased in brightness and in the number of hot spots suggesting that the supernova shock wave has collided with the dense pre-existing circumstellar medium, a scenario supported by radio and X-ray observations. Such a shocked environment is widely expected to result in the acceleration of charged parti...
متن کاملFlare hard X-rays from neutral beams
A new mechanism is presented for the production of bremsstrahlung radiation from neutral beams (p+,e−) and its possible relevance to flare heating and production of hard xray bursts is discussed. Beam electrons lag behind the protons, due to differential drag in collisions with the background, but their longitudinal velocities are closely tied to the protons by the electric field generated. How...
متن کاملBlazars in hard X–rays
Although blazars are thought to emit most of their luminosity in the γ–ray band, there are subclasses of them very prominent in hard X–rays. These are the best candidates to be studied by Simbol–X. They are at the extremes of the blazar sequence, having very small or very high jet powers. The former are the class of TeV emitting BL Lacs, whose synchrotron emission often peaks at tens of keV or ...
متن کاملThe Relative Effects of X-Rays, Gamma Rays and Beta Rays on Chromosomal Breakage in Tradescantia.
OR some time it has been generally considered that the production of F chromosomal aberrations in Tradescantia and many other materials is essentially independent of the wave length of the exciting radiation in the region shorter than 1.5 A. This view has not been seriously questioned in recent years and to date has remained one of the fundamental tenets of radiobiology. A number of isolated in...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1988
ISSN: 0252-9211
DOI: 10.1017/s0252921100094355