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A Variable Infrared Counterpart to the Soft Gamma-ray Repeater SGR 1806-20

George Kosugi·Ryusuke Ogasawara·Hiroshi Terada
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Abstract

We present K'-band (2.12 micron) imaging observations of the SGR 1806-20 field taken during its very active phase in mid 2004, which reveal brightening of sources within the Chandra X-ray error circle when compared with earlier images obtained in 2002. One source brightened by more than a factor of 2, and so we consider this to be the probable infrared counterpart for SGR 1806-20. The other two sources are located in close proximity to the probable counterpart and show marginal brightening, which may suggest that the high-energy photons emitted from the SGR during its active phase have induced dust sublimation or brightening of the unresolved background around the SGR.

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George Kosugi, Ryusuke Ogasawara, Hiroshi Terada. 2005-03-11. A Variable Infrared Counterpart to the Soft Gamma-ray Repeater SGR 1806-20. https://doi.org/10.1086/430171

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