期刊
NATURE ASTRONOMY
卷 5, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41550-020-1192-2
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资金
- China National Space Administration (CNSA)
- Chinese Academy of Sciences (CAS)
- National Program on Key Research and Development Project from the Ministry of Science and Technology of China (MOST) [2016YFA0400800]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB23040400]
- National Natural Science Foundation of China [U1838111, U1838115, U1838201, U1838202, 11473027, 11633006, 11673023, 11733009]
- National Key Research and Development Program of China [2016YFA0400704]
- Royal Society Newton Funds
This passage reports the discovery of high-energy LFQPOs in black hole X-ray binaries, and suggests that these oscillations may originate from the precession of a small-scale jet. The study reveals that the behavior of LFQPOs changes with energy, posing a new challenge to existing models.
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 similar to 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.
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