Astrophys. J., 603, 523-530 (2004/March-2)
The ultraluminous X-ray source NGC 1313 X-2 (MS 0317.7-6647) and its environment.
ZAMPIERI L., MUCCIARELLI P., FALOMO R., KAARET P., DI STEFANO R., TUROLLA R., CHIEREGATO M. and TREVES A.
Abstract (from CDS):
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 m image, the Chandra error box embraces an R=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, and XMM-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. The derived optical luminosity (L~105L☉) is consistent with that of a ~15-20 M☉companion. The properties of the environment of NGC 1313 X-2 are briefly discussed.
Galaxies: Individual: NGC Number: NGC 1313 - Stars: Individual: Alphanumeric: NGC 1313 X-2/MS 0317.7-6647 - X-Rays: Binaries - X-Rays: Galaxies
Fig.3, Table 1: [ZMF2004] A (Nos A-D).
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