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Chandra and HST Confirmation of the Luminous and Variable X-ray Source IC 10 X-1 as a Possible Wolf-Rayet, Black-Hole Binary | | F.E. Bauer
; W.N. Brandt
; | | Date: |
2 Oct 2003 | | Journal: | Astrophys.J. 601 (2004) L67-L70 | | Subject: | astro-ph | | Affiliation: | IoA/Psu) and W.N. Brandt (PSU | | Abstract: | We present a Chandra and HST study of IC 10 X-1, the most luminous X-ray binary in the closest starburst galaxy to the Milky Way. Our new hard X-ray observation of X-1 confirms that it has an average 0.5-10 keV luminosity of 1.5e38 erg/s, is strongly variable (a factor of ~2 in >3 ks), and is spatially coincident (within 0.’23 +/-0.’30) with the Wolf-Rayet (WR) star [MAC92] 17A in IC 10. The spectrum of X-1 is best fit by a power law with photon index of ~1.8 and a thermal plasma with kT~1.5 keV, although systematic residuals hint at further complexity. Taken together, these facts suggest that X-1 may be a black hole belonging to the rare class of WR binaries; it is comparable in many ways to Cyg X-3. The Chandra observation also finds evidence for extended X-ray emission co-spatial with the large non-thermal radio superbubble surrounding X-1. | | Source: | arXiv, astro-ph/0310039 | | Services: | Forum | Review | PDF | Favorites | |
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