Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6827k&link_type=abstract
HST Proposal ID #6827
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Hst Proposal Id #6827 Interstellar Medium
Scientific paper
We prospose to try to identify an optical/UV counterpart of the Soft Gamma-ray Repeater {SGR} 0525-66, the most enigmatic of a class of sources, which, for reasons unknown, repeatedly show high-energy bursts. One SGR, 1806-20, has been identified with a plerionic supernova remnant, with a persistent X-ray source as well as a very luminous star coincident with the peak. For SGR 0525-60, the 5-March-1979 burst, the brightest burst ever observed, has led to a localisation to the northern part of the supernova remnant N49 in the LMC. Neither plerionic radio emission, nor a bright companion have been found, but there is a persistent X-ray source inside the error box. It is very unlikely find such a bright source in the 0.09 square arcmin error box by chance, but even so we recently found evidence for another, variable source right next to the persistent one. From SGR 1806-20, we infer that SGR events are associated not only with bursts of photons but also with strong burst of particles. For any reasonable ratio of the energy in particles to that in gamma- rays, the March 1979 event of SGR 0525-66 alone would suffice to power a small plerionic nebula. This nebula can account for the presistent X-ray source, and should also be detectable in the optical/UV. However, HST is needed to resolve it from the underlying emission of N49. With HST, we might even find that the plerion has the shape of a bow shock, due to the high transversal speed of the underlying power source.
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