Optical Counterpart of The Ultraluminous X-ray Source NGC 1313 X-2

Details Optical Counterpart of The Ultraluminous X-ray Source NGC 1313 X-2 Optical Counterpart of The Ultraluminous X-ray Source NGC 1313 X-2

2003-09-25

arxiv.org/abs/astro-ph/0309687v1

Nucl.Phys.Proc.Suppl.132:387-391,2004

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, to appear in Proc. of the BeppoSAX Symposium: "The Restless High-Energy Universe" (Amsterdam, May 5-8, 2003

Scientific paper

10.1016/j.nuclphysbps.2004.04.06

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 $R=21.6$ mag stellar-like object and excludes a previously proposed optical counterpart. The resulting X-ray/optical flux ratio of NGC 1313 X-2 is $\sim 500$. The value of $f_X/f_{opt}$, 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 ($L\approx 10^5 L_\odot$) is consistent with that of a $\approx 10 M_\odot$ companion.

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