2011MNRAS.410.2497R -
Mon. Not. R. Astron. Soc., 410, 2497-2505 (2011/February-1)
Multistate observations of the galactic black hole XTE J1752-223: evidence for an intermediate black hole spin.
REIS R.C., MILLER J.M., FABIAN A.C., CACKETT E.M., MAITRA D., REYNOLDS C.S., RUPEN M., STEEGHS D.T.H. and WIJNANDS R.
Abstract (from CDS):
The Galactic black hole candidate XTE J1752-223 was observed during the decay of its 2009 outburst with the Suzaku and XMM-Newton observatories. The observed spectra are consistent with the source being in the `intermediate' and `low-hard' states, respectively. The presence of a strong, relativistic iron emission line is clearly detected in both observations and the line profiles are found to be remarkably consistent and robust to a variety of continuum models. This strongly points to the compact object in XTE J1752-223 being a stellar mass black hole accretor and not a neutron star. Physically motivated and self-consistent reflection models for the Fe Kα emission-line profile and disc reflection spectrum rule out either a non-rotating, Schwarzschild black hole or a maximally rotating, Kerr black hole at greater than 3σ level of confidence. Using a fully relativistic line function in which the black hole spin parameter is a variable, we have formally constrained the spin parameter to be 0.52±0.11(1σ). Furthermore, we show that the source in the low-hard state still requires an optically thick disc component having a luminosity which is consistent with the L∝T4 relation expected for a thin disc extending down to the innermost stable circular orbit. Our result is in contrast to the prevailing paradigm that the disc is truncated in the low-hard state.
Abstract Copyright:
2010 The Authors. Journal compilation2010 RAS
Journal keyword(s):
accretion, accretion discs - black hole physics - line: profiles - relativistic processes - X-rays: binaries - X-rays: individual: XTE J1752-223
Simbad objects:
8
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