Gamma-ray astrophysics: parsecs to megaparsecs |
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Authors: | Ocker C De Jager |
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Institution: | (1) Space Research Unit Dept. of Physics, Potchefstroom University for CHE, 2520 Potchefstroom, South Africa |
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Abstract: | A rapidly spinning, slowly accreting magnetic white dwarf (or X-ray pulsar) in hibernation is expected to result in rapid spindown as a result of the stretching and reconnection of magnetic field lines, leading to particle acceleration at the magnetospheric radiusoutside the corotation radius, and the propeller type ejection of magnetized synchrotron-emitting clouds. This may explain the non-thermal (radio and -rays) emission seen from the unique nearby AE Aquarii. Moving to Galactic distances we show how TeV -ray observations of pulsar-driven supernova remnants (with well-measured synchrotron X-ray spectra) allow us to obtain a direct measurement of the average magnetic field strength in the nebula. Finally, GeV to TeV observations of -ray blazars out to redshifts of 2 allow us to probe the intergalactic infrared radiation field, the Hubble constant and possibly the parameter of the Universe. |
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Keywords: | White Dwarfs Supernova Remnants Blazars Gamma Rays |
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