1. Optical counterpart of the ultraluminous X-ray source NGC 1313 X-2
- Author
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Zampieri, L., Mucciarelli, P., Falomo, R., Kaaret, P., Di Stefano, R., Turolla, R., Chieregato, M., and Treves, A.
- Subjects
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OPTICS , *X-rays , *STELLAR luminosity function , *LUMINESCENCE - Abstract
We present new optical and Chandra observations of the field containing the ultraluminous X-ray source NGC1313 X-2. On an ESO 3.6 m image, the Chandra error box embraces a
R=21.6 mag stellar-like object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is ∼500. The value offX/fopt , the X-ray variability history and spectral distribution indicate a luminous X-ray binary in NGC 1313 as a likely explanation for NGC 1313 X-2. The inferred optical luminosity (L≈105L◎ ) is consistent with that of a≈10M◎ companion. [Copyright &y& Elsevier]- Published
- 2004
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