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

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

2005-03-11

arxiv.org/abs/astro-ph/0503280v1

Astrophys.J. 623 (2005) L125-L128

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ Letters. (12 pages, 3 figures)

Scientific paper

10.1086/430171

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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