Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070

Abstract

We study X-ray and soft gamma-ray spectra from the hard state of the accreting black-hole binary MAXI J1820+070. We perform analysis of joint spectra from HXMT, NuSTAR and INTEGRAL. We find an overall agreement between the spectra from all three satellites. Satisfactory fits to the data require substantial spectral complexity, with our models including two Comptonization regions and their associated disk reflection, a disk blackbody and a narrow Fe K$\alpha$ line. Our fits confirm the presence of the truncation of the reflecting optically-thick disk at least at $>$10 gravitational radii. However, we find that the HXMT data alone cannot significantly constrain the disk inner radii.

arXiv commentApJ, in press, 10 pages

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• Accretion Scenario of MAXI J1820+070 during 2018 Outbursts with Multi-mission Observations
• Can observations of 511 keV line from the M31 galaxy shed light on the AGN jet composition?
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• A possible overall scenario for the outburst evolution of MAXI J1820+070 revealed by Insight-HXMT
• A moderate spin for the black hole in X-ray binary MAXI J1348-630 revealed by Insight-HXMT
• A NuSTAR and Swift View of the Hard State of MAXI J1813-095
• Proof of principle X-ray reflection mass measurement of the black hole in H1743-322
• The spectral-timing analysis of Cygnus X-1 with Insight-HXMT
• The 2018 outburst of MAXI J1820+070 as seen by Insight-HXMT
• In-orbit performance of LE onboard Insight-HXMT in the first 5 years