Abstract
We present new optical and Chandra observations of the field containing the ultraluminous X-ray source NGC 1313 X-2. On an ESO 3.6 mi mage, theChandra error box embraces an R ¼ 21:6 pointlike object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is � 500. The value of fX=fopt, the X-ray variability history, and the spectral distribution derived from a reanalysis of the ROSAT, ASCA ,a ndXMM-Newton data indicate a luminous X-ray binary in NGC 1313 as a likely explanation for NGC 1313 X-2. If the X-ray soft component observed in the XMM-Newton EPIC spectrum originates from an accretion disk, the inferred mass of the compact remnant is � 100 M� , making it an intermediate-mass black hole.
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