Optical Counterpart of The Ultraluminous X-ray Source NGC 1313 X-2
arXiv:astro-ph/0309687 · doi:10.1016/j.nuclphysbps.2004.04.068
Abstract
We present new optical and {\it Chandra} observations of the field containing the ultraluminous X-ray source NGC1313 X-2. On an ESO 3.6 m image, the {\it Chandra} error box embraces a mag stellar-like object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is . The value of , 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 () is consistent with that of a companion.
arXiv comment5 pages, 1 figure, to appear in Proc. of the BeppoSAX Symposium: "The Restless High-Energy Universe" (Amsterdam, May 5-8, 2003), E.P.J. van den Heuvel, J.J.M. in 't Zand, and R.A.M.J. Wijers (Eds), Nucl. Physics B. Suppl. Ser., Elsevier
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