Rapidly alternating flux states of GX 339–4 during its 2021 outburst captured by Insight–HXMT

Author:

Liu Honghui1,Jiang Jiachen2,Zhang Zuobin1,Bambi Cosimo1,Ji Long3ORCID,Kong Lingda45,Zhang Shu45

Affiliation:

1. Department of Physics, Fudan University, 200438 Shanghai, China

2. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK

3. School of Physics and Astronomy, Sun Yat-Sen University, 519082 Zhuhai, China

4. Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 100049 Beijing, China

5. Chinese Academy of Sciences, University of Chinese Academy of Sciences, 100049 Beijing, China

Abstract

ABSTRACT The low-mass X-ray binary GX 339–4 entered a new outburst in 2021. At the end of the hard to soft transition of this outburst, Insight–HXMT found that the source rapidly alternated between low flux and high flux states on a time-scale of hours. Two high flux states lasted only for a period comparable to the orbital period of the observatory. Time-resolved spectral analysis shows that the sudden changes of flux are confined in the hard X-ray band (>4 keV). The variable non-thermal emission, including the power-law continuum from the corona and the reflected emission from the inner accretion disc, is responsible for the observed variability. The strength of the disc thermal emission and the inner radius of the accretion disc are consistent between the two flux states. Assuming the lamppost geometry, our best-fitting disc reflection models suggest a very low corona height (within 3 Rg) and there is no evidence of significant variation in the corona geometry either. The observed rapidly alternating flux states suggest that the intrinsic power of the corona must change during the state transition. We discuss possible mechanisms for the observed sudden changes in the coronal power of GX 339–4.

Funder

Natural Science Foundation of Shanghai

Shanghai Municipal Education Commission

Fudan University

National Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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