Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.230..279d&link_type=abstract
Astrophysics and Space Science, Volume 230, Issue 1-2, pp. 279-298
Astronomy and Astrophysics
Astrophysics
1
White Dwarfs, Supernova Remnants, Blazars, Gamma Rays
Scientific paper
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 andγ-rays) emission seen from the unique nearby AE Aquarii. Moving to Galactic distances we show how TeVγ-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 ofγ-ray blazars out to redshifts of ˜ 2 allow us to probe the intergalactic infrared radiation field, the Hubble constant and possibly the Ω parameter of the Universe.
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