Broadband X-ray analysis of 1E 1740.7-2942: constraints on spin, inclination and a tentative black hole mass

Abstract

1E 1740.7-2942 is one of the strongest hard X-ray emitters in the Galactic Centre region, believed to be a black hole in a high-mass X-ray binary system. Although extensively studied in X-rays, many aspects about the underlying nature of the system are still unknown. For example, X-ray data analyses of 1E 1740.7-2942 up to date have not yet unveiled the signature of a reflection component, whose modelling could be used to estimate parameters such as the spin of the black hole and inclination of the disc. We report here on the determination of these parameters from the analysis of the reflection component present in a public \textit{NuSTAR} observation which hasn't been subject to any previous study. We include \textit{XMM-Newton} and \textit{INTEGRAL} data to build a combined spectrum, enabling a joint analysis of both the disc and comptonisation components. Results point to a relatively high inclination disc $\gtrsim$ 50${}^{\circ }$ (3 $\sigma$) and a near-maximum speed rotating black hole. The former is in agreement with a previous radio study and the latter is reported here for the first time. Lastly, we follow the methodology of recent efforts to weight black holes with only X-ray spectra and find results that suggest a black hole mass of about 5 M${}_{\odot }$ for 1E 1740.7-2942.

12 pages, 10 figures. accepted by MNRAS for publication

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Cited by in corpus (11)

• A catalogue of high-mass X-ray binaries in the Galaxy: from the INTEGRAL to the Gaia era
• A Systematic View of Ten New Black Hole Spins
• Systematically Revisiting All NuSTAR Spins of Black Holes in X-Ray Binaries
• The current state of disk wind observations in BHLMXBs through X-ray absorption lines in the iron band
• Jet-ISM Interactions near the Microquasars GRS 1758-258 and 1E 1740.7-2942
• Study of the excess Fe XXV line emission in the central degrees of the Galactic centre using XMM-Newton data
• Quantifying the evidence against a mass gap between black holes and neutron stars
• Broadband X-ray properties of black holes GRS 1758-258 and 1E 1740.7-2942: AstroSat and NuSTAR results
• The population of NuSTAR Black Hole X-ray Binaries
• Empirical correlation between masses of black holes and Wolf-Rayet stars derived from their mass distributions in spectroscopic binaries
• On the behavior of the black hole candidate 1E 1740.7-2942's corona based on long-term INTEGRAL database