A Comparative Study Of Black Hole X-ray Binary Mini-Outburst And Normal Outburst

The black hole X-ray binary is composed of a black hole and a companion star.The companion star and its surrounding material are accreted to the central compact celestial body through viscous force,and an accretion disk is formed around it,which is formed perpendicular to the accretion disk under the action of a large-scale magnetic field.The relativistic jet structures are coupled with each other to generate multi-band radiation such as radio,ultraviolet,optical,and X-rays.According to the spectral and timing of X-rays,black hole X-ray binary are divided into five states: quiescent state,low\hard state,intermediate state,high\soft state,and very high state.The transition of states and the spectral and timevarying properties of different states are usually studied by outburst.The Rossi X-ray Timing Explorer（RXTE）satellite has detected normal and mini-bursts in black hole X-ray binaries.In this paper,the differences between the spectral and timing of normal outbursts and mini-outbursts are compared.Observationally,a q-type trajectory is found in the HardnessIntensity Diagram（HID）of normal bursts,but not in mini-outbursts that only occur in the low\hard state.The results show that at the same photon count rate,the hysteresis effect of the mini-outburst is not obvious,and the X-ray spectral of the mini-outburst is harder than that of the normal outburst.In addition,the results of the correlation analysis show that under the same X-ray flux,the mini-outbursts are all in the inverse proportion,that is,the negative correlation part.The X-ray spectral evolution can be well explained by the state transition model from SSD disk（ShakuraSunyaev disk）to advection-dominated accretion flow,implying that minibursts may be caused by discrete accretion events with low accretion rates.In this paper,we will study the origin of mini-outbursts by comparing the spectral and timing of normal outbursts and mini-outbursts.The first chapter introduces the black hole X-ray binary,including the properties of spectral and timing.The second chapter introduces the observational characteristics,statistical laws and physical interpretation of minioutbursts.The third chapter focuses on the analysis of the normal outbursts spectral and timing characteristics of black hole X-ray binary.The fourth chapter studies the hysteresis effect and spectral of the black hole X-ray binary mini-outbursts.The last chapter summarizes and looks forward to all the work.