The Evolution of the Broadband Temporal Features Observed in the Black-hole Transient MAXI J1820+070 with Insight-HXMT

Wang, Yanan; Ji, Long; Zhang, S. N.; Méndez, Mariano; Qu, J. L.; Maggi, Pierre; Ge, M. Y.; Qiao, Erlin; Tao, Lian; Zhang, S.; Altamirano, D.; Zhang, L.; Ma, Xiang; Lu, Fangjun; Li, T. P.; Huang, Y.; Zheng, S.; Chen, Y. P.; Chang, Zhi; Tuo, Y. L.; Güngör, Can; Song, L. M.; Xu, Yupeng; Cao, X. L.; Chen, Y.; Liu, C. Z.; Bu, Q. C.; Cai, C.; Chen, G.; Chen, L.; Chen, T. X.; Chen, Y. B.; Cui, Wei; Cui, Weiwei; Deng, J. K.; Dong, Yanting; Du, Y. Y.; Fu, M. X.; Gao, G. H.; Gao, He; Gao, Min; Gu, Y. D.; Guan, J.; Guo, Chengcheng; Han, Danxiang; Jia, Haiqiang; Jia, S. M.; Jiang, Luhua; Jiang, Weichun; Jin, J.; Jin, Y. J.; Kong, L. D.; Li, B.; Li, C. K.; Li, G.; Li, M. S.; Li, W.; Li, X.; Li, X. B.; Li, X. F.; Li, Y. G.; Li, Z. W.; Liang, X. H.; Liao, J. Y.; Liu, G. Q.; Liu, Han–Wen; Liu, X. J.; Liu, Y. N.; Lü, Bo; Lu, X. F.; Luo, Q.; Luo, T.; Meng, Bin; Nang, Y.; Nie, J. Y.; Ou, G.; Sai, N.; Shang, R. C.; Song, X. Y.; Sun, Liang; Tan, Ying; Wang, G. F.; Wang, J.; Wang, W. S.; Wang, Y. D.; Wang, Y. S.; Wen, X. Y.; Wu, B. B.; Wu, B. Y.; Wu, Mei‐Hwan; Xiao, G. C.; Xiao, Shuo; Xiong, S. L.; Yang, Jianping; Yang, S.; Yang, Yi-Jung; Yi, Q. B.; Yin, Q. Q.; You, Y.; Zhang, A. M.; Zhang, C. M.; Zhang, Faming; Zhang, H. M.; Zhang, J.; Zhang, T.; Zhang, W. C.; Zhang, W.; Zhang, W. Z.; Zhang, Y. F.; Zhang, Y. J.; Zhang, Y.; Zhang, Zhaojian; Zhang, Z. L.; Zhao, H.; Zhao, X. F.; Zhou, D. K.; Zhou, Jianfeng; Zhuang, R. L.; Zhu, Yuxuan; Wang, Lingjun

doi:10.3847/1538-4357/ab8db4

Cited by 39 publications

(50 citation statements)

References 45 publications

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“…MAXI J1820+070 is one of the brightest BHBs detected so far, and has exhibited a great amount of activity in radio (Bright et al 2020;Homan et al 2020), NIR (Sánchez-Sierras & Muñoz-Darias 2020), optical (Muñoz-Darias et al 2019;Paice et al 2019;Shidatsu et al 2019;Veledina et al 2019), ultraviolet (UV; Kajava et al 2019), and X-ray (Buisson et al 2019;Kara et al 2019;Espinasse et al 2020;Wang et al 2020b;Buisson et al 2021;You et al 2021;Zdziarski et al 2021). In the hard state, reverberation analysis using the Neutron Star Interior Composition Interior Explorer (NICER; Gendreau et al 2016) showed that while the broad iron line profile remained constant (and only the narrow component decreased), the frequency range where the (soft) reverberation lag dominated increased (Kara et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-timing Analysis

Wang

Mastroserio

Kara

et al. 2021

ApJL

101

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We analyze five epochs of Neutron star Interior Composition Explorer (NICER) data of the black hole X-ray binary MAXI J1820+070 during the bright hard-to-soft state transition in its 2018 outburst with both reflection spectroscopy and Fourier-resolved timing analysis. We confirm the previous discovery of reverberation lags in the hard state, and find that the frequency range where the (soft) reverberation lag dominates decreases with the reverberation lag amplitude increasing during the transition, suggesting an increasing X-ray emitting region, possibly due to an expanding corona. By jointly fitting the lag-energy spectra in a number of broad frequency ranges with the reverberation model reltrans, we find the increase in reverberation lag is best described by an increase in the X-ray coronal height. This result, along with the finding that the corona contracts in the hard state, suggests a close relationship between spatial extent of the X-ray corona and the radio jet. We find the corona expansion (as probed by reverberation) precedes a radio flare by ∼5 days, which may suggest that the hard-to-soft transition is marked by the corona expanding vertically and launching a jet knot that propagates along the jet stream at relativistic velocities.Unified Astronomy Thesaurus concepts: Low-mass x-ray binary stars (939); Stellar mass black holes (1611); High energy astrophysics (739); Black hole physics (159); X-ray transient sources (1852)

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Section: Introductionmentioning

confidence: 99%

Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-timing Analysis

Wang

Mastroserio

Kara

et al. 2021

ApJL

101

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“…Follow-up X-ray observations since its outburst were carried out by other X-ray telescopes, e.g., Swift 22 , NuSTAR 23 , and NICER 24 . The long-term and high cadence observation of MAXI J1820 + 070 by Hard X-ray Modulation Telescope (called Insight-HXMT) 25 was carried from 2018-03-14 (MJD 58191) to 2018-10-21 (MJD 58412) 26 . Figure 1 shows the Insight-HXMT HE (red)/ME (blue)/LE (green) light curves (Fig.…”

Section: Introductionmentioning

confidence: 99%

Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070

You

Tuo

et al. 2021

Nat Commun

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A black hole X-ray binary produces hard X-ray radiation from its corona and disk when the accreting matter heats up. During an outburst, the disk and corona co-evolves with each other. However, such an evolution is still unclear in both its geometry and dynamics. Here we report the unusual decrease of the reflection fraction in MAXI J1820+070, which is the ratio of the coronal intensity illuminating the disk to the coronal intensity reaching the observer, as the corona is observed to contrast during the decay phase. We postulate a jet-like corona model, in which the corona can be understood as a standing shock where the material flowing through. In this dynamical scenario, the decrease of the reflection fraction is a signature of the corona’s bulk velocity. Our findings suggest that as the corona is observed to get closer to the black hole, the coronal material might be outflowing faster.

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“…X-ray transients spend most of their lives in a quiescent state but show bright outbursts lasting for weeks to months with a recurrence time varying from months to decades (Tanaka & Shibazaki 1996;Chen et al 1997;Tomsick & Kaaret 2000). Compared to supermassive black holes, stellar-mass black holes display much richer and faster variability and thus provide an ideal window to study the evolution of extreme astrophysical phenomena, such as accretion and ejection processes, in an observable timescale (e.g., Shakura & Sunyaev 1973;Poutanen & Fabian 1999;Belloni et al 2000;Uttley et al 2005Uttley et al , 2014Altamirano & Méndez 2015;Wang et al 2020).…”

Section: Introductionmentioning

confidence: 99%

A Variable Ionized Disk Wind in the Black Hole Candidate EXO 1846–031

Wang

Ji²,

Garcia

et al. 2020

ApJ

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After 34 yr, the black hole candidate EXO1846-031 went into outburst again in 2019. We investigate its spectral properties in the hard intermediate and the soft states with NuSTAR and Insight-HXMT. A reflection component has been detected in the two spectral states but possibly originating from different illumination spectra: in the intermediate state, the illuminating source is attributed to a hard coronal component, which has been commonly observed in other X-ray binaries, whereas in the soft state, the reflection is probably produced by disk selfirradiation. Both cases support EXO1846-031 as a low-inclination system of~ 40 . An absorption line is clearly detected at ∼7.2 keV in the hard intermediate state, corresponding to a highly ionized disk wind (x > log 6.1) with a velocity of up to 0.06c. Meanwhile, quasi-simultaneous radio emissions have been detected before and after the X-rays, implying the coexistence of disk winds and jets in this system. If only the high-flux segment of the NuSTAR observation is considered, the observed wind appears to be magnetically driven. The absorption line disappeared in the soft state and a narrow emission line appeared at ∼6.7 keV on top of the reflection component, which may be evidence for disk winds, but data with higher spectral resolution are required to examine this.

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The Evolution of the Broadband Temporal Features Observed in the Black-hole Transient MAXI J1820+070 with Insight-HXMT

Cited by 39 publications

References 45 publications

Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-timing Analysis

Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-timing Analysis

Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070

A Variable Ionized Disk Wind in the Black Hole Candidate EXO 1846–031

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