Intermittent properties of the quasi-periodic oscillations of MAXI J1820+070 revealed by Insight-HXMT

被引：3
|
作者：
Zhang, P. [1 ,2 ]
Soria, R. [3 ,4 ,5 ]
Zhang, S. [6 ]
Ji, L. [7 ]
Kong, L. D. [8 ]
Chen, Y. P. [6 ]
Zhang, S. N. [6 ,9 ]
Chang, Z. [6 ]
Ge, M. Y. [6 ]
Li, J. [10 ,11 ]
Liu, G. C. [1 ,2 ]
Liu, Q. Z. [10 ,12 ]
Ma, X. [6 ]
Peng, J. Q. [6 ,9 ]
Qu, J. L. [6 ,9 ]
Shui, Q. C. [6 ,9 ]
Tao, L. [6 ]
Tian, H. J. [1 ,2 ,13 ]
Wang, P. J. [6 ,9 ]
Yan, J. Z. [12 ]
Zeng, X. Y. [1 ,2 ]
机构：
[1] China Three Gorges Univ, Coll Sci, Yichang 443002, Peoples R China
[2] China Three Gorges Univ, Ctr Astron & Space Sci, Yichang 443002, Peoples R China
[3] Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China
[4] INAF Osservatorio Astrofisico Torino, Str Osservatorio 20, I-10025 Pino Torinese, Italy
[5] Univ Sydney, Sydney Inst Astron, Sch Phys A28, Sydney, NSW 2006, Australia
[6] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, 19B Yuquan Rd, Beijing 100049, Peoples R China
[7] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China
[8] Eberhard Karls Univ Tubingen, Inst Astron & Astrophys, Kepler Ctr Astro & Particle Phys, Sand 1, D-72076 Tubingen, Germany
[9] Chinese Acad Sci, Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[10] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China
[11] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
[12] Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Peoples R China
[13] Hangzhou Dianzi Univ, Sch Sci, Hangzhou 310018, Peoples R China
来源：
ASTRONOMY & ASTROPHYSICS | 2023年 / 677卷
基金：
中国国家自然科学基金;
关键词：
X-rays: binaries; X-rays: individuals: MAXI J1820+070; X-RAY BINARY; ACCRETION-EJECTION INSTABILITY; BLACK-HOLE; XTE J1550-564; HARD STATE; FREQUENCY; EVOLUTION; VARIABILITY; PRECESSION; FLOW;
D O I：
10.1051/0004-6361/202346309
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the dynamical properties of low-frequency quasi-periodic oscillations (QPOs) observed from the black hole X-ray binary MAXI J1820+070 during the early part of its 2018 outburst, when the system was in a bright hard state. To do this, we used a series of observations from the Hard X-ray Modulation Telescope Insight-HXMT and applied a wavelet decomposition (weighted wavelet Z-transforms) to the X-ray light curve. We find that the QPO phenomenon is intermittent within each individual observation, with some subintervals in which the oscillation is strongly detected (high root-mean-square amplitude) and others in which it is weak or absent. The average lifetime of individual QPO segments is about 5 oscillation cycles, with a 3 sigma tail of up to about 20 cycles. There is no substantial difference between the energy spectra during intervals with strong and weak or absent QPOs. Alternatively, we suggest that the changes in oscillation amplitude can be caused by changes in the jet speed. We discuss a possible reason for the intermittent QPO strength within the precessing-jet model previously proposed for MAXI J1820+070: we suggest that the changes in oscillation amplitude are caused by changes in the jet speed. We argue that a misaligned precessing-jet scenario is also consistent with other recent observational findings that suggest that the oscillation of the Compton reflection component is in phase with the QPOs.
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页数：8
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