Re-examining the XMM-Newton Spectrum of the Black Hole Candidate XTE J1652-453

Abstract

The XMM-Newton spectrum of the black hole candidate XTE J1652-453 shows a broad and strong Fe K-alpha emission line, generally believed to originate from reflection of the inner accretion disc. These data have been analysed by Hiemstra et al. (2011) using a variety of phenomenological models. We re-examine the spectrum with a self-consistent relativistic reflection model. A narrow absorption line near 7.2 keV may be present, which if real is likely the Fe XXVI absorption line arising from highly ionised, rapidly outflowing disc wind. The blue shift of this feature corresponds to a velocity of about 11100 km/s, which is much larger than the typical values seen in stellar-mass black holes. Given that we also find the source to have a low inclination (i < 32 degrees; close to face-on), we would therefore be seeing through the very base of outflow. This could be a possible explanation for the unusually high velocity. We use a reflection model combined with a relativistic convolution kernel which allows for both prograde and retrograde black hole spin, and treat the potential absorption feature with a physical model for a photo-ionised plasma. In this manner, assuming the disc is not truncated, we could only constrain the spin of the black hole in XTE J1652-453 to be less than ~ 0.5 Jc/GM^{2} at the 90% confidence limit.

8 pages, 8 figures, accepted for publication in MNRAS

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• Astrophysical Black Holes: A Compact Pedagogical Review
• On the determination of the spin and disc truncation of accreting black holes using X-ray reflection
• Testing the no-hair theorem with the continuum-fitting and the iron line methods: a short review
• The truncated and evolving inner accretion disc of the black hole GX 339-4
• NuSTAR monitoring of MAXI J1348-630: evidence of high density disc reflection
• Studying the Reflection Spectra of the New Black Hole X-ray Binary Candidate MAXI J1631-479 Observed by NuSTAR: A Variable Broad Iron Line Profile
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• High-density reflection spectroscopy of black hole X-ray binaries in the hard state
• Accreting Black Holes
• Accretion Geometry of Black Hole X-ray Binaries: Insights from X-ray Observations