Background model for the high-energy telescope of Insight-HXMT

Liao, J. Y.; Zhang, Shu; Lu, X. F.; Zhang, Juan; Li, Gang; Chang, Zhi; Chen, Yupeng; Ge, Ming-Yu; Guo, Chengcheng; Huang, Rui; Jin, Jing; Li, Xiaobo; Li, Xu-Fang; Li, Zhengwei; Liu, Cong‐Zhan; Lu, Fangjun; Nie, J. Y.; Song, Liming; Wang, Sifan; You, Y.; Zhang, Yifei; Zhao, H. S.; Zhang, Shuang‐Nan

doi:10.1016/j.jheap.2020.04.002

Cited by 65 publications

(36 citation statements)

References 25 publications

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“…2.02. The background is estimated by the standalone scripts hebkgmap, mebkgmap, and lebkgmap (Guo et al 2020;Liao et al 2020aLiao et al , 2020b. We screen good time intervals by considering the recommended criteria, i.e., an elevation angle >10°, a geomagnetic cutoff rigidity >8 GeV, a pointing offset angle <0.1, and at least 300 s away from the South Atlantic Anomaly.…”

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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“…The criteria for estimating good time intervals is as follows: 1) the elevation angle is larger than 10 degree; 2) the geomagnetic cutoff rigidity is larger than 8 GeV; 3) the pointing offset angle is smaller than 0.1 degree; 4) at least 300 s away from the South Atlantic Anomaly (SAA). The spectral backgrounds were calculated by using the tools LEBKGMAP, MEBKGMAP, and HEBKGMAP (Liao et al 2020b;Guo et al 2020;Liao et al 2020a).…”

Section: Data Reductionmentioning

confidence: 99%

The spins of the Galactic black holes in MAXI J1535-571 and 4U 1630-472 from Insight-HXMT

Liu,

Bambi

et al. 2021

Preprint

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Insight-HXMT is the first Chinese X-ray astronomical mission. With a 1-250 keV bandpass, an energy resolution of 150 eV at 6 keV, and without being subject to pile-up distortions, it is suitable to study bright X-ray sources like Galactic black holes. In the present paper, we study Insight-HXMT observations of the X-ray binaries MAXI J1535-571 and 4U 1630-472 during their outbursts in 2017 and 2020, respectively. From the analysis of the reflection features, we are able to infer the black hole spin parameter in the two sources. For MAXI J1535-571, we find a spin parameter very close to 1, a * = 0.9916 ± 0.0012 (90% C.L.), which is consistent with the previous NuSTAR measurement. For 4U 1630-472, we find a moderately high value of the black hole spin parameter, a * = 0.817 ± 0.014 (90% C.L.), which is lower than the almost extremal value found with NuSTAR data.

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“…Therefore, the flare is suspected to be induced by the low-energy charged particles in part area of the low earth orbit, which are diffuse and can hardly penetrate the aluminum plate above the blind FOV detector and spacecraft shell. For a regular pointing observation, these flares can be identified by comparing the light curves measured by the detectors with small and large FOVs (Figure 2), and hence be removed with the same method as adopted in LE (Liao et al 2020). This method can detect the relatively bright flares, while the missed faint flares may slip into the filtered data and contribute the systematical error of the background model at low and high energy ends of the spectrum.…”

Section: Data Reductionmentioning

confidence: 99%

The Background Model of the Medium Energy X-ray telescope of Insight-HXMT

Guo¹,

Liao²,

Zhang³

et al. 2020

Preprint

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The Medium Energy X-ray Telescope (ME) is one of the main payloads of the Hard X-ray Modulation Telescope (dubbed as Insight-HXMT ). The background of Insight-HXMT /ME is mainly caused by the environmental charged particles and the background intensity is modulated remarkably by the geomagnetic field, as well as the geographical location. At the same geographical location, the background spectral shape is stable but the intensity varies with the level of the environmental charged particles. In this paper, we develop a model to estimate the ME background based on the ME database that is established with the two-year blank sky observations of the high Galactic latitude. In this model, the entire geographical area covered by Insight-HXMT is divided into grids of 5 • × 5 • in geographical coordinate system. For each grid, the background spectral shape can be obtained from the background database and the intensity can be corrected by the contemporary count rate of the blind FOV detectors. Thus the background spectrum can be obtained by accumulating the background of all the grids passed by Insight-HXMT during the effective observational time. The model test with the blank sky observations shows that the systematic error of the background estimation in 8.9 − 44.0 keV is ∼ 1.3% for a pointing observation with an average exposure ∼ 5.5 ks. We also find that the systematic error is anti-correlated with the exposure, which indicates the systematic error is partly contributed by the statistical error of count rate measured by the blind FOV detectors.

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Background model for the high-energy telescope of Insight-HXMT

Cited by 65 publications

References 25 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 spins of the Galactic black holes in MAXI J1535-571 and 4U 1630-472 from Insight-HXMT

The Background Model of the Medium Energy X-ray telescope of Insight-HXMT

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