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Astron. Astrophys. 319, 923-927 (1997)

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JCMT observations of Soft Gamma-Ray Repeaters *

I.A. Smith 1, A.S.B. Schultz 2, K. Hurley 3, J. van Paradijs 4, 5 and L.B.F.M. Waters 4, 6

1 Department of Space Physics and Astronomy, Rice University, P.O. Box 1892, Houston, TX 77251-1892, USA
2 NASA Ames Research Center, MS 245-6, Moffett Field, CA 94035-1000, USA
3 Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
4 Astronomical Institute 'Anton Pannekoek', University of Amsterdam & Center for High-Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
5 Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899, USA
6 SRON Laboratory for Space Research, P.O. Box 800, 9700 AV Groningen, The Netherlands

Received 9 April 1996 / Accepted 2 September 1996

Abstract

The spectra of the quiescent counterparts to the Soft Gamma-Ray Repeaters SGR 1900+14 and SGR 1806-20 peak in the infrared. Their infrared spectra appear to contain several components: the photospheric emission from star(s) dominates at shorter wavelengths, a bright point source dominates at 25 µm, while an extended source dominates at 60 µm. However, we show here that these counterparts were not detected by the James Clerk Maxwell Telescope at 450 µm or 800 µm. These observations are consistent with other millimeter studies, and are consistent with the detection of a point-like "core" to the radio nebula of SGR 1806-20. We show that monoenergetic synchrotron radiation and black body spectra are too broad to be consistent with both the infrared and submillimeter observations. However, simple dust models can explain the combined observations.

Key words: gamma rays: bursts – radio continuum: stars – infrared: stars – supernovae: general – stars: neutron

* The James Clerk Maxwell Telescope is operated by the Royal Observatories on behalf of the Particle Physics and Astronomy Research Council of the United Kingdom, the Netherlands Organisation for Scientific Research, and the National Research Council of Canada.

Send offprint requests to: Ian A. Smith

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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