Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-26
Astrophys.J. 603 (2004) 523-530
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures; submitted to The Astrophysical Journal
Scientific paper
10.1086/381541
We present new optical and {\it Chandra} observations of the field containing the ultraluminous X-ray source NGC 1313 X-2. On an ESO 3.6 m image, the {\it Chandra} error box embraces a $R=21.6$ point-like object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is $\sim 500$. The value of $f_X/f_{opt}$, the X-ray variability history and the spectral distribution derived from a re-analysis of the {\it ROSAT}, {\it ASCA} and {\it XMM} 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 {\it XMM} EPIC spectrum originates from an accretion disk, the inferred mass of the compact remnant is $\approx 100 M_\odot$, making it an intermediate mass black hole. The derived optical luminosity ($L\approx 10^5 L_\odot$) is consistent with that of a $\approx 15-20 M_\odot$ companion. The properties of the environment of NGC 1313 X-2 are briefly discussed.
Chieregato Matteo
Di Stefano Rosanne
Falomo Renato
Kaaret Phil
Mucciarelli Paola
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