Fig. 3: Time-evolutions of the free parameters in the best-fitting of the spectral model (1).
From: Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070
The evolution of the dimensionless reflection fraction Rf which is defined as the ratio of intensity emitted towards the disk to that emitted to infinity, the dimensionless index q1 of the emissivity profile, the electron temperature Te in units of keV, and the incident photon index Γ, are plotted in subpanels (a), (b), (c), and (d), respectively. Assuming an inclination angle θ = 63∘, the inner/outer radius of the reflection disk Rin = RISCO (RISCO is innermost stable circular orbit) and Rout = 1000 Rg, the black hole spin a = 0.998. The black points correspond to the median of the values and the error bars correspond to 68% confidence interval, which is calculated using the corner59 package to analyse the probability distributions derived from the MCMC chains. The uncertainties of the fitted parameters arise from both the statistical and systematic uncertainties.
