中国科学院机构知识库网格系统: An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242

中国科学院机构知识库网格

Chinese Academy of Sciences Institutional Repositories Grid

An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242

文献类型：期刊论文


作者	HXMT
刊名	Astronomy and Astrophysics
出版日期	2020
卷号	641 页码:A101
ISSN号	0004-6361
关键词	accretion accretion disks black hole physics X-rays: binaries time Astrophysics - High Energy Astrophysical Phenomena Abstract: Aims: Flip-flops are top-hat-like X-ray flux variations, which have been observed in some transient accreting black hole binary systems, and feature simultaneous changes in the spectral hardness and the power density spectrum (PDS). They occur at a crucial time in the evolution of these systems, when the accretion disc emission starts to dominate over coronal emission. Flip-flops remain a poorly understood phenomenon, so we aim to thoroughly investigate them in a system featuring several such transitions. Methods: Within the multitude of observations of Swift J1658.2-4242 during its outburst in early 2018, we detected 15 flip-flops, enabling a detailed analysis of their individual properties and the differences between them. We present observations by XMM-Newton, NuSTAR, Astrosat, Swift, Insight-HXMT, INTEGRAL, and ATCA. We analysed their light curves, searched for periodicities, computed their PDSs, and fitted their X-ray spectra, to investigate the source behaviour during flip-flop transitions and how the interval featuring flip-flops differs from the rest of the outburst. Results: The flip-flops of Swift J1658.2-4242 are of an extreme variety, exhibiting flux differences of up to 77% within 100 s, which is much larger than what has been seen previously. We observed radical changes in the PDS simultaneous with the sharp flux variations, featuring transitions between the quasi-periodic oscillation types C and A, which have never been observed before. Changes in the PDS are delayed, but more rapid than changes in the light curve. Flip-flops occur in two intervals within the outburst, separated by about two weeks in which these phenomena were not seen. Transitions between the two flip-flop states occurred at random integer multiples of a fundamental period of 2.761 ks in the first interval and 2.61 ks in the second. Spectral analysis reveals the high and low flux flip-flop states to be very similar, but distinct from intervals lacking flip-flops. A change of the inner temperature of the accretion disc is responsible for most of the flux difference in the flip-flops. We also highlight the importance of correcting for the influence of the dust scattering halo on the X-ray spectra.
DOI	10.1051/0004-6361/202037657
文献子类	Journal Article
语种	英语
源URL	[http://ir.ihep.ac.cn/handle/311005/291336]
专题	硬X射线调制望远镜卫星
推荐引用方式 GB/T 7714	HXMT. An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242[J]. Astronomy and Astrophysics,2020,641:A101.
APA	HXMT.(2020).An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242.Astronomy and Astrophysics,641,A101.
MLA	HXMT."An underlying clock in the extreme flip-flop state transitions of the black hole transient Swift J1658.2-4242".Astronomy and Astrophysics 641(2020):A101.

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来源：高能物理研究所

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