The infrared counterpart of the bright X-ray source GX340+0

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Astronomical Photometry, Astronomical Spectroscopy, Infrared Sources (Astronomy), Luminosity, X Ray Sources, Milky Way Galaxy, Satellite Observation, Sounding Rockets

Scientific paper

We report the detection of an unresolved IR source of K' = 17.3 +/- 0.5 at a position coincident with that of the intense but thus far optically-unidentified X-ray source GX340+0. This object is a 'Z source', similar in X-ray and radio properties to Sco X-1. If the K-band luminosities of the two systems are also similar, our observations imply that GX340+0 is 6 x more distant than Sco X-1. Although there is some possibility of a chance superposition of an unrelated object, we believe this IR source is the counterpart of GX340+0.

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