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The eclipsing massive X-ray binary M33 X-7: New X-ray observations and optical identification | | W.Pietsch
; B.J.Mochejska
; Z.Misanovic
; F.Haberl
; M.Ehle
; G.Trinchieri
; | | Date: |
4 Oct 2003 | | Journal: | Astron.Astrophys. 413 (2004) 879-887 | | Subject: | astro-ph | | Abstract: | The eclipsing X-ray binary M33 X-7 was in the field of view during several observations of our XMM-Newton M33 survey and in the archival Chanfdra observation 1730 which cover a large part of the 3.45 d orbital period. We detect emission of M33 X-7 during eclipse and a soft X-ray spectrum of the source out of eclipse that can best be described by bremsstrahlung or disk blackbody models. No significant regular pulsations of the source in the range 0.25-1000 s were found. The average source luminosity out of eclipse is 5E37 erg/s (0.5-4.5 keV). In a special analysis of DIRECT observations we identify as optical counterpart a B0I to O7I star of 18.89 mag in V which shows the ellipsoidal heating light curve of a high mass X-ray binary with the M33 X-7 binary period. The location of the X-ray eclipse and the optical minima allow us to determine an improved binary period and ephemeris of mid-eclipse as HJD (2451760.61+-0.09)+- N * (3.45376+-0.00021). The mass of the compact object derived from orbital parameters and the optical companion mass, the lack of pulsations, and the X-ray spectrum of M33 X-7 may indicate that the compact object in the system is a black hole. M33 X-7 would be the first detected eclipsing high mass black hole X-ray binary. | | Source: | arXiv, astro-ph/0310111 | | Services: | Forum | Review | PDF | Favorites | |
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