Studies on the time response distribution of Insight-HXMT/LE

Zhao, Xiaofan; Zhu, Yuxuan; Han, Danxiang; Cui, Wei; Li, Wei; Wang, Juan; Wang, Yusa; Zhang, Yi; Yang, Yanji; Lu, Bo; Jia, Haiqiang; Chen, Tianxiang; Li, Mao-Shun; Lv, Zhiyong; Chen, Yong

doi:10.1016/j.jheap.2019.08.002

Cited by 14 publications

(14 citation statements)

References 4 publications

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“…The main pulse of LE is delayed by about 850 µs as compared with HE and ME. This is due to the special readout mechanism of the swept charge devices for LE (Zhao et al 2019;Zhou et al 2021). The accurate offset of LE is measured by the method in section 4.2.…”

Section: Results Of Jodrell Bank Radio Ephemeris For the Crab Pulsarmentioning

confidence: 99%

In-orbit timing calibration of the Insight-Hard X-ray Modulation Telescope

Tuo,

Li,

et al. 2021

Preprint

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We describe the timing system and the timing calibration results of the three payloads onboard the Insight-Hard X-ray Modulation Telescope (Insight-HXMT). The three payloads are the High Energy X-ray telescope (HE, 20-250 keV), the Medium Energy X-ray telescope (ME, 5-30 keV) and the low Energy X-ray telescope (LE, 1-10 keV). We present a method to correct the temperature-dependent period response and the long-term variation of the onboard crystal oscillator, especially for ME which does not carry a temperature-compensated crystal oscillator. The time of arrivals (ToAs) of the Crab pulsar are measured to evaluate the accuracy of the timing system. In the case that the Crab ephemeris of radio Jodrell Bank has 40 µs systematic error (Rots et al. 2004), we use the data observed by X-ray Timing Instrument (XTI) on board the Neutron star Interior Composition Explorer (NICER) to produce the Crab ephemerides. The energy-dependent ToAs' offsets relative to NICER measurements

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Section: Results Of Jodrell Bank Radio Ephemeris For the Crab Pulsarmentioning

confidence: 99%

In-orbit timing calibration of the Insight-Hard X-ray Modulation Telescope

Tuo,

Li,

et al. 2021

Preprint

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“…We select the photons observed by detectors for LE because the extinction effect at lower energy band during the occultation is obvious due to the larger cross section of the Earth's upper atmospheric compositions (Figure 2). LE consists of three detector boxes each containing 32 pieces of CCD236 (Chen et al, 2020) that is the second-generation Swept Charge Device (SCD) designed for X-ray spectroscopy (Holland and Pool, 2008;Zhao et al, 2019). The collimators divide each detector box of LE into four kinds of fields of view (FOV).…”

Section: Data Reductionmentioning

confidence: 99%

“…The collimators divide each detector box of LE into four kinds of fields of view (FOV). For each detector box, 20 CCD236 have small FOVs of 1.6 (Zhao et al, 2019;Chen et al, 2020;. The detector response matrix is generated through calibration database hxmt CALDB (v2.05) 1 .…”

Section: Data Reductionmentioning

confidence: 99%

Measurement of vertical atmospheric density profile from the X-ray Earth occultation of the Crab Nebula with Insight-HXMT

et al. 2022

Preprint

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Abstract. The X-ray Earth occultation sounding (XEOS) is an emerging method for measuring the neutral density in the lower thermosphere. In this paper, the X-ray Earth occultation (XEO) of the Crab Nebula is investigated by using the Insight-HXMT. The pointing observation data on the 30th September, 2018 recorded by the Low Energy X-ray telescope (LE) of Insight-HXMT are selected and analyzed. The extinction lightcurves and spectra during the X-ray Earth occultation process are extracted. A forward model for the XEO lightcurve is established and the theoretical observational signal for lightcurve is predicted. A Bayesian data analysis method is developed for the XEO lightcurve modeling and the atmospheric density retrieval. The posterior probability distribution of the model parameters is derived through the Markov Chain Monte Carlo (MCMC) algorithm with the NRLMSISE-00 model and the NRLMSIS 2.0 model as basis functions and the best-fit density profiles are retrieved respectively. It is found that in the altitude range of 105–200 km, the retrieved density profile is 88.8 % of the density of NRLMSISE-00 and 109.7 % of the density of NRLMSIS 2.0 by fitting the lightcurve in the energy range of 1.0–2.5 keV based on XEOS method. In the altitude range of 95–125 km, the retrieved density profile is 81.0 % of the density of NRLMSISE-00 and 92.3 % of the density of NRLMSIS 2.0 by fitting the lightcurve in the energy range of 2.5–6.0 keV based on XEOS method. In the altitude range of 85–110 km, the retrieved density profile is 87.7 % of the density of NRLMSISE-00 and 101.4 % of the density of NRLMSIS 2.0 by fitting the lightcurve in the energy range of 6.0–10.0 keV based on XEOS method. The measurements of density profiles are compared with the NRLMSISE-00/NRLMSIS 2.0 model simulations and the previous retrieval results with RXTE satellite. Finally, we find that the retrieved density profile from Insight-HXMT based on the NRLMSISE-00/NRLMSIS 2.0 models is qualitatively consistent with the previous retrieved results from RXTE. This study demonstrate that the XEOS from the X-ray astronomical satellite Insight-HXMT can provide an approach for the study of the upper atmosphere. The Insight-HXMT satellite can join the family of the XEOS. The Insight-HXMT satellite with other X-ray astronomical satellites in orbit can form a space observation network for XEOS in the future.

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“…LE uses the swept charge device (SCD) CCD236 (Zhao et al 2019). It has 96 SCDs, with a sensitive thickness of 50 µm.…”

Section: Detector Constructionsmentioning

confidence: 99%

Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT

Zhang

et al. 2020

Astrophys Space Sci

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Insight-HXMT, the first X-ray astronomical satellite in China, aims to reveal new sources in the Galaxy and to study fundamental physics of X-ray binaries from 1 keV to 250 keV. It has three collimated telescopes, the High Energy X-ray telescope (HE), the Medium Energy X-ray telescope (ME) and the Low Energy X-ray telescope (LE). Before the launch, in-orbit backgrounds of these three telescopes had been estimated through Geant4 simulation, in order to investigate the instrument performance and the achievement of scientific goals. In this work, these simulated backgrounds are compared with in-orbit observations. Good agreement is shown for all three telescopes. For HE, 1) the deviation of the simulated background rate after two years of operation in space is ∼ 5% from the observation; 2) the total background spectrum and the relative abundance of the ∼67 keV line show long-term increases both in simulations and observations. For ME,

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Studies on the time response distribution of Insight-HXMT/LE

Cited by 14 publications

References 4 publications

In-orbit timing calibration of the Insight-Hard X-ray Modulation Telescope

In-orbit timing calibration of the Insight-Hard X-ray Modulation Telescope

Measurement of vertical atmospheric density profile from the X-ray Earth occultation of the Crab Nebula with Insight-HXMT

Comparison of simulated backgrounds with in-orbit observations for HE, ME, and LE onboard Insight-HXMT

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