Computer Science
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..366...89v&link_type=abstract
High velocity neutron stars and gamma-ray bursts. AIP Conference Proceedings, Volume 366, pp. 89-95 (1996).
Computer Science
Gamma-Ray Sources, Gamma-Ray Bursts, Radio, Microwave
Scientific paper
We report the results of radio flux-monitoring and high resolution observations at 3.6 cm with the VLA, of the central condensation in G10.0-0.3, the radio nebula surrounding the soft gamma ray repeater (SGR) 1806-20. The quiescent X-ray source AX 1805.7-2025 is coincident with the radio core suggesting that G10.0-0.3 is a plerionic nebula. The monitoring experiment, lasting five months was started just before the latest reactivation of SGR 1806-20 in γ-rays. There is no apparent increase in the radio flux density from the central region of G10.0-0.3 on timescales of days to months following the γ-ray bursts. At subarcsecond resolution, the core of G10.0-0.3 is seen to consist of a compact source with diffuse, one-sided emission. This structure on arcsecond scales is similar to the arcminute sized structure seen in low resolution maps of G10.0-0.3. We localize the position of SGR 1806-20 to better than 1'', the best ever for a high energy transient. We discuss the implications of our observations for SGR scenarios. So far there is no compelling observational evidence for either of the two models discussed for SGRs, the pulsar model or the accreting binary model.
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