Nonlinear Variability Observed with Insight-HXMT in MAXI J1820+070 and MAXI J1535-571

被引：2
|
作者：
Ding, Qi [1 ,2 ]
Ji, Long [3 ]
Bu, Qing-Cui [4 ]
Dong, Tiekuang [1 ]
Chang, Jin [1 ,5 ]
机构：
[1] Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210033, Peoples R China
[2] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
[3] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519000, Peoples R China
[4] Eberhard Karls Univ Tubingen, Inst Astron & Astrophys, Kepler Ctr Astro & Particle Phys, Sand 1, D-72076 Tubingen, Germany
[5] Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China
来源：
RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2023年 / 23卷 / 08期
基金：
中国国家自然科学基金;
关键词：
black hole physics; instrumentation: detectors; methods: data analysis; X-rays: binaries; QUASI-PERIODIC OSCILLATIONS; STATE;
D O I：
10.1088/1674-4527/acdc88
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the timing analysis of the nonlinear variability in two black hole low mass X-ray binaries MAXI J1820+070 and MAXI J1535-571 by using the bicoherence, a measure of phase coupling at different Fourier frequencies. We found different patterns, e.g., "cross" and "hypotenuse," for LFQPOs in different outburst states. When they can be clearly distinguished, bicoherence patterns are similar over a wide energy range of 1-100 keV. It is intriguing that in some type-C QPOs we found the patterns that are normally observed in type-B QPOs. On the contrary, the "hypotenuse" pattern, a characteristic of type-C QPOs, was detected in a type-B QPO. This suggests that different types of QPOs may originate from similar underlying mechanisms. In addition, we speculate that the nonlinear variability may be a promising approach to disentangle distinct QPO models which assume different interactions between the broadband noise and QPO components.
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页数：9
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