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 an 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 Kα 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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2022
- DOI:
- 10.3847/1538-4357/ac54a7
- arXiv:
- arXiv:2112.08116
- Bibcode:
- 2022ApJ...928...11Z
- Keywords:
-
- Galaxy accretion;
- Non-thermal radiation sources;
- X-ray binary stars;
- Low-mass x-ray binary stars;
- 575;
- 1119;
- 1811;
- 939;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- ApJ, in press, 10 pages