X-ray spectral and timing evolution during the 2018 outburst of MAXI J1820+070

We made use high-cadence observations from the Insight-HXMT and NICER to scrutinize the spectral and timing evolution during the 2018 outburst of the black hole X-ray binary (BHXRB) MAXI J1820+070. It's hardness-intensity diagram (HID) displays a ''q''-like track including all the spectral states, along a unique loop in the hard state. The tracks observed in the HID is anticipated in the evolution of the components responsible for Compton and reflection emission. This is substantiated by the relationship between the X-ray luminosity LX and photon index, as well as the relationship between X-ray luminosity LX and the ratio of Compton to disk luminosities LC/LD. Both of these relationships exhibit a pattern reminiscent of HID. During the hard state, the hardness (also) is determined by either reflection component (R₅>1) or Compton component (R₅<1) depending on the value reflection fraction R₅. So the distinctive evolution of R₅ leads to the unique loop in the HID (also in the LX-- plane) of hard state. Additionally, we found a negative correlation between frequency of the type-C quasi-periodic oscillation (QPO) (₂, ₐ₏₎) and the optical depth of the Compton emission (), and a positive correlation between ₂, ₐ₏₎ and. These correlations strongly suggest a coupling between the QPO properties and the underlying process responsible for Comptonization.