A possible overall scenario for the outburst evolution of MAXI J1820+070 revealed by Insight-HXMT

被引：6

作者：

Peng, J. Q. ^{[1
,2
]}

Zhang, S. ^{[1
]}

Chen, Y. P. ^{[1
]}

Kong, L. D. ^{[1
,2
,3
]}

Wang, P. J. ^{[1
,2
]}

Zhang, S. N. ^{[1
,2
]}

Ji, L.

Tao, L. ^{[1
]}

Qu, J. L. ^{[1
,2
]}

Ge, M. Y. ^{[1
]}

Shui, Q. C. ^{[1
,2
]}

Li, J. ^{[4
,5
,6
]}

Chang, Z. ^{[1
]}

Li, Z. S. ^{[7
]}

Xiao, Y. X. ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Eberhard Karls Univ Tubingen, Inst Astron & Astrophys, Kepler Ctr Astro & Particle Phys, Sand 1, D-72076 Tubingen, Germany

[4] Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China

[5] Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China

[6] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China

[7] Xiangtan Univ, Key Lab Stars & Interstellar Medium, Xiangtan 411105, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 518卷 / 02期

基金：

中国国家自然科学基金;

关键词：

X-rays: binaries; X-rays: individual (MAXI J1820+070); QUASI-PERIODIC OSCILLATIONS; BLACK-HOLE CANDIDATES; X-RAYS; ACCRETION; CORONA; DISK; VARIABILITY; INSTABILITY; HYSTERESIS; SPECTRUM;

D O I：

10.1093/mnras/stac3238

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the spectral and temporal properties of the black hole X-ray transient binary MAXI J1820+070 during the 2018 outburst with Insight-HXMT observations. The outburst of MAXI J1820+070 can be divided into three intervals. For the two intervals of the outburst, we find that low-energy (below 140 keV) photons lag high-energy (140-170 keV) ones, while in the decay of the outburst, high-energy photons lag low-energy photons, both with a time-scale of the order of days. Based on these results, the canonical hysteresis effect of the 'q' shape in the hardness-intensity diagram can be reformed into a roughly linear shape by taking into account the lag corrections between different energy bands. Time analysis shows that the high-frequency break of hard X-rays, derived from the power-density spectrum of the first interval of the outburst, is in general larger and more variable than that of soft X-rays. The spectral fitting shows that the coverage fraction of the hard X-rays drops sharply at the beginning of the outburst to about 0.5, and then increases slightly. The coverage fraction drops to roughly zero once the source steps into soft state and increases gradually to unity when the source returns to low-hard state. We discuss the possible overall evolution scenario of corona hinted from these discoveries.

引用

页码：2521 / 2528

页数：8

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