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- W4386648059 abstract "The development of techniques to measure accurately black hole spins is crucial to study the physics and astrophysics of these objects. X-ray reflection spectroscopy is currently the most popular method to estimate the spins of accreting black holes; so far it has provided a spin measurement of about 40 stellar-mass black holes in X-ray binaries and 40 supermassive black holes in active galactic nuclei. The relativistic precession model is another method to measure the spins of stellar-mass black holes: it requires the measurement of the frequencies of three simultaneous quasi-periodic oscillations and can potentially provide very precise estimates of the black hole mass and spin. However, the two methods do not seem to provide consistent results when applied to the same sources, which questions the actual reliability and accuracy of these measurements. Recently, the relativistic precession model has been applied to infer the spin of the black hole in XTE J1859+226 (Motta et al. 2022). The authors found $a_* = 0.149 pm 0.005$ (68% CL) and there are no other spin measurements of this source. We looked for archived RXTE observations of XTE J1859+226 with blurred reflection features and found 23 spectra suitable for measuring the black hole spin. We employed two different models with relxill and relxillD and obtained a higher spin value from all these fits. From the further simultaneous fitting performed on two different subsets of the total set of 23 spectra, we infer the black hole spin parameter $a_* = 0.986^{+0.001}_{-0.004}$ and $a_* =0.987 pm 0.003$ (90% CL, statistical) with relxill and relxillD for the first set and, $a_*$ = $0.981_{-0.007}^{+0.006}$ and $0.982_{-0.007}^{+0.006}$ (90% CL, statistical) for the second set, respectively. This clearly confirms the discrepancy between the black hole spin measurements inferred from the two techniques." @default.
- W4386648059 created "2023-09-13" @default.
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- W4386648059 date "2023-09-10" @default.
- W4386648059 modified "2023-10-18" @default.
- W4386648059 title "Measuring Black Hole Spins through X-ray Reflection Spectroscopy and the Relativistic Precession Model: the case of XTE J1859+226" @default.
- W4386648059 doi "https://doi.org/10.48550/arxiv.2309.05018" @default.
- W4386648059 hasPublicationYear "2023" @default.
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