The Medium Energy X-ray telescope (ME) onboard the Insight-HXMT astronomy satellite

Cao, X. L.; Jiang, Weichun; Meng, Bin; Zhang, WanChang; Luo, T.; Yang, S.; Zhang, Chunlei; Gu, Y. D.; Sun, Liang; Liu, Xiaojing; Yang, Jiawei; Liang, Xian; Tan, Ying; Liu, ShaoZhen; Du, Yifeng; Lu, Fangjun; Xu, Yupeng; Guan, J.; Zhang, Shuang‐Nan; Wang, Huan‐Yu; Li, Ti-Pei; Zhang, Chengmo; Wen, Xiang-Yang; Qu, J. L.; Song, Liming; Li, Xiaobo; Ge, M. Y.; Zhou, Yadong; Xiong, S. L.; Zhang, Shu; Yongjie, Zhang; Ze-hao, Cheng; Zhang, Fei; Li, Mao-Shun; Liang, X. H.; Gao, Min; Yang, En-Bo; Liu, Xiaohang; Liu, Hongwei; Yang, Yi-Jung; Zhang, Fan

doi:10.1007/s11433-019-1506-1

Cited by 139 publications

(79 citation statements)

References 14 publications

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“…Insight-HXMT is the first Chinese X-ray telescope and consists of low-, medium-, and high-energy detectors covering the broadband energy range of 1-250 keV (Cao et al 2020;Chen et al 2020;Liu et al 2020;Zhang et al 2020). We extract light curves and spectra following the official user guide 6 and using the software HXMTDAS ver.…”

Section: Observation and Data Reductionmentioning

confidence: 99%

Testing Evolution of LFQPOs with Mass Accretion Rate in GRS 1915+105 with Insight-HXMT

Bambi

Jain

et al. 2021

ApJ

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Using the Insight-HXMT observations of GRS 1915+105 when it exhibits low-frequency quasiperiodic oscillations (QPOs), we measure the evolution of the QPO frequency along with disk inner radius and mass accretion rate. We find a tight positive correlation between the QPO frequency and mass accretion rate. Our results extend the finding of previous work with AstroSat to a larger range of accretion rates with independent instruments and observations. Treating the QPO frequency of GRS 1915+105 as the relativistic dynamic frequency of a truncated disk, we are able to confirm the high spin nature of the black hole in GRS 1915+105. We also address the potential of our finding to test general relativity in the future.

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Section: Observation and Data Reductionmentioning

confidence: 99%

Testing Evolution of LFQPOs with Mass Accretion Rate in GRS 1915+105 with Insight-HXMT

Bambi

Jain

et al. 2021

ApJ

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“…Insight-HXMT was launched on 2017 June 15. It carries three slat-collimated instruments on board (Zhang et al 2020), the High Energy X-ray telescope (HE: 20-250 keV; Liu et al 2020), the Medium Energy X-ray telescope (ME: 5-30 keV; Cao et al 2020;Guo et al 2020) and the Low Energy X-ray telescope (LE: 1-15 keV; Chen et al 2020;Liao et al 2020).…”

Section: Observations and Data Reductionmentioning

confidence: 99%

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

Wang

Ji²,

Zhang

et al. 2020

ApJ

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We study the evolution of the temporal properties of MAXIJ1820+070 during the 2018 outburst in its hard state from MJD58,190 to 58,289 with Insight-HXMT in a broad energy band 1-150 keV. We find different behaviors of the hardness ratio, the fractional rms and time lag before and after MJD58,257, suggesting a transition occurred around this point. The observed time lags between the soft photons in the 1-5 keV band and the hard photons in higher energy bands, up to 150 keV, are frequency-dependent: the time lags in the low-frequency range, 2-10mHz, are both soft and hard lags with a timescale of dozens of seconds but without a clear trend along the outburst; the time lags in the high-frequency range, 1-10Hz, are only hard lags with a timescale of tens of milliseconds; they first increase until around MJD58,257 and decrease after this date. The high-frequency time lags are significantly correlated to the photon index derived from the fit to the quasi-simultaneous NICER spectrum in the 1-10 keV band. This result is qualitatively consistent with a model in which the high-frequency time lags are produced by Comptonization in a jet.Unified Astronomy Thesaurus concepts: Black holes (162); Compact objects (288); Low-mass x-ray binary stars (939)

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“…The background was estimated using the scripts LEBKGMAP and MEBKGMAP (Liao et al 2020;Guo et al 2020). The energy bands used in the spectral analysis are 1-9 keV and 10-20 keV for the low-and medium-energy (LE and ME) detectors, respectively (Chen et al 2020;Cao et al 2020).…”

Section: Observations and Data Analysismentioning

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 Medium Energy X-ray telescope (ME) onboard the Insight-HXMT astronomy satellite

Cited by 139 publications

References 14 publications

Testing Evolution of LFQPOs with Mass Accretion Rate in GRS 1915+105 with Insight-HXMT

Testing Evolution of LFQPOs with Mass Accretion Rate in GRS 1915+105 with Insight-HXMT

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

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

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