Speaker
Description
A black hole X-ray binary produces hard X-ray radiation from its corona and disk when the accreting matter heats up. During an outburst, the disk and corona co-evolve with each other. MAXI J1820 + 070 (ASASSN-18ey) is a low-mass BH X-ray binary, discovered in X-rays with MAXI on 11 March 2018. During the 2018 outburst, this source underwent the rising hard state, the soft state, and then the decaying hard state. In this talk, I will review the recent studies on this source, mainly concentrating on the geometrical and dynamic evolutions of the disk and corona. In the rising hard state, the outflowing corona and its evolution will be discussed by presenting the X-ray spectral analysis of HXMT-Insight observation. And, in the decaying hard state, the disk is found to recede over time, and the corona reaches the Magnetically Arrested Disk (MAD) state, with the radio/optical/X-ray high-cadence observations.
