Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT

doi:10.1038/s41550-020-1192-2

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	Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT
	Ma, Xiang; Tao, Lian; Zhang, Shuang-Nan; Zhang, Liang; Bu, Qing-Cui; Ge, Ming-Yu; Chen, Yu-Peng; Qu, Jin-Lu; Zhang, Shu; Lu, Fang-Jun
刊名	Nature Astronomy
	2021
卷号	5 页码:94
ISSN号	2397-3366
DOI	10.1038/s41550-020-1192-2
英文摘要	Low-frequency quasiperiodic oscillations (LFQPOs) are commonly found in black hole X-ray binaries, and their origin is still under debate. The properties of LFQPOs at high energies (above 30 keV) are closely related to the nature of the accretion flow in the innermost regions, and thus play a crucial role in critically testing various theoretical models. The Hard X-ray Modulation Telescope is capable of detecting emissions above 30 keV, and is therefore an ideal instrument to do so. Here we report the discovery of LFQPOs above 200 keV in the new black hole MAXI J1820+070 in the X-ray hard state, which allows us to understand the behaviours of LFQPOs at hundreds of kiloelectronvolts. The phase lag of the LFQPO is constant around zero below 30 keV, and becomes a soft lag (that is, the high-energy photons arrive first) above 30 keV. The soft lag gradually increases with energy and reaches ~0.9 s in the 150-200 keV band. The detection at energies above 200 keV, the large soft lag and the energy-related behaviours of the LFQPO pose a great challenge for most existing models, but suggest that the LFQPO probably originates from the precession of a small-scale jet.
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/289789]
专题	高能物理研究所_粒子天体物理中心硬X射线调制望远镜卫星
推荐引用方式 GB/T 7714	Ma, Xiang,Tao, Lian,Zhang, Shuang-Nan,et al. Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT[J]. Nature Astronomy,2021,5:94.
APA	Ma, Xiang.,Tao, Lian.,Zhang, Shuang-Nan.,Zhang, Liang.,Bu, Qing-Cui.,...&Zhuang, Ren-Lin.(2021).Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT.Nature Astronomy,5,94.
MLA	Ma, Xiang,et al."Discovery of oscillations above 200 keV in a black hole X-ray binary with Insight-HXMT".Nature Astronomy 5(2021):94.