Volume 345, Issue 2-3 e230184
PROCEEDING

A comparative study on the spectra of normal outburst and mini-outbursts of black hole X-ray binary XTE J1550-564

Wei-Long He

Wei-Long He

School of Physics and Electronic Science, Guizhou Normal University, Guiyang, China

Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang, China

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Xue-Kun Zhang

Xue-Kun Zhang

School of Physics and Electronic Science, Guizhou Normal University, Guiyang, China

Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang, China

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Wei-Jia Yang

Wei-Jia Yang

Faculty of Innovation Engineering, Macau University of Science and Technology, Macau, China

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Ai-Jun Dong

Corresponding Author

Ai-Jun Dong

School of Physics and Electronic Science, Guizhou Normal University, Guiyang, China

Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang, China

Correspondence

Ai-Jun Dong, School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China.

Email: [email protected]

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Kang Ge

Kang Ge

Physics Group, Anshun National Middle School, Anshun, China

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First published: 18 January 2024

Abstract

One normal outburst and three mini-outbursts have been detected by Rossi X-ray Timing Explorer (RXTE) satellite after 2000 in the well-known black hole X-ray binary XTE J1550-564. In our work, we explored the energy spectral properties of the four outbursts and the three mini-outbursts retained in the Low/Hard state. The results show that the X-ray spectra of the three mini-outbursts are harder than that of normal outburst and have no disk component. In the correlation analysis, the Γ L X / L Edd $$ \Gamma -{L}_{\mathrm{X}}/{L}_{\mathrm{Edd}} $$ anti-relationship of the three mini-outbursts suggested that it may be a result of the incomplete evolutionary success of Shakura-Sunyaev disk. The whole X-ray spectral correlation evolution shows well the state transition from the Shakura-Sunyaev disk to the advection-dominated accretion flow. We think that the three mini-outbursts may originated from a small discrete accretion event.

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