Mid-infrared spectra of SGR 1806-20 and SGR 1900+14

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Gamma-Ray Sources, Gamma-Ray Bursts, Infrared

Scientific paper

Two of the three known soft gamma repeaters, SGR 1806-20 and SGR 1900+14, have a fairly small angular separation and are visible from Mt. Palomar. During the nights of 21-23 June 1997 we observed both in the mid-infrared using SpectroCam-10 on the 5-meter Hale telescope. We obtained excellent images of the counterpart to SGR 1900+14 in 6 bands using narrow filters (Δλ~1 μm) from approximately 8 to 13 μm. The intensities in these 6 bands, summed over the two star-like components of the suspected counterpart, were all ~2-3 Jy and together yielded the first mid-infrared spectrum of this object. A spectrum of the SGR 1806-20 counterpart was also obtained, but it displayed a significantly different shape and showed a source intensity of only ~0.1 Jy. When combined with near-infrared and IRAS observations, the spectra imply that the counterparts of both SGRs consist of multiple components at different temperatures.

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