On-ground calibration of the Hitomi Hard X-ray Telescopes

Mori, Hajime; Miyazawa, Tatsuo; Awaki, Hisamitsu; Matsumoto, Hironori; Babazaki, Yasunori; Bandai, Ayako; Demoto, Tadatsugu; Furuzawa, Akihiro; Haba, Yoshito; Hayashi, Takayuki; Iizuka, Ryo; Ishibashi, Koji; Ishida, M.; Ishida, Naoki; Itoh, M.; Iwase, Toshiki; Kato, Hiroki; Kobayashi, Hiroaki; Kosaka, Tatsuro; Kunieda, H.; Kurashima, Shou; Kurihara, Daichi; Kuroda, Yuuji; Maeda, Yoshitomo; Meshino, Yoshifumi; Mitsuishi, Ikuyuki; Miyata, Yusuke; Nagano, Hosei; Namba, Yoshiharu; Ogasaka, Yasushi; Ogi, Keiji; Okajima, Takashi; Saji, Shigeoki; Shimasaki, Fumiya; Sato, T.; Sato, Toshiki; Shima, Naotsugu; Sugita, S.; Suzuki, Yoshio; Tachibana, Kunihide; Tachibana, S.; Takizawa, Shunya; Tamura, Kouichi; Tawara, Yuzuru; Tomikawa, Kazuki; Torii, Takayoshi; Uesugi, Kentaro; Yamashita, Koujun; Yamauchi, Shigeo

doi:10.1117/1.jatis.4.1.011210

Cited by 11 publications

(7 citation statements)

References 27 publications

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“…8, the deviations between the Crab spectra and the bestfit model are <5% at energies below ≃50 keV. The telescope effective area is measured with uncertainties less than ≃2% on ground 34 and confirmed by the Crab observation. 3 Although both the telescopes and detectors are well calibrated, residuals of ∼13% level are seen above 50 keV.…”

Section: Crab Spectrasupporting

confidence: 64%

In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)

2018

J. Astron. Telesc. Instrum. Syst.

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The Hard X-ray Imager (HXI) onboard Hitomi (ASTRO-H) is an imaging spectrometer covering hard xray energies of 5 to 80 keV. Combined with the Hard X-ray Telescope, it enables imaging spectroscopy with an angular resolution of 1 0 .7 half-power diameter, in a field of view of 9 0 × 9 0 . The main imager is composed of four layers of Si detectors and one layer of CdTe detector, stacked to cover a wide energy band up to 80 keV, surrounded by an active shield made of Bi 4 Ge 3 O 12 scintillator to reduce the background. The HXI started observations 12 days before the Hitomi loss and successfully obtained data from G21.5-0.9, Crab, and blank sky. Utilizing these data, we calibrate the detector response and study properties of in-orbit background. The observed Crab spectra agree well with a powerlaw model convolved with the detector response, within 5% accuracy. We find that albedo electrons in specified orbit strongly affect the background of the Si top layer and establish a screening method to reduce it. The background level over the full field of view after all the processing and screening is as low as the preflight requirement of 1 − 3 × 10 −4 counts s −1 cm −2 keV −1 . © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Crab Spectrasupporting

confidence: 64%

In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)

2018

J. Astron. Telesc. Instrum. Syst.

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“…As a result, there were no delays in the schedule of software preparation and no delay in the release of tools and the calibration database. The products were well calibrated using instrument-specific methods, [12][13][14][15][16][17][18][19][20][21] because all the algorithms were imported into the analysis software and the latest calibration information was quickly released in the database. 5 2d-Hitomi − .…”

Section: Lessons Learned From Hitomimentioning

confidence: 99%

Detailed design of the science operations for the XRISM mission

Terada

Holland

Loewenstein

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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X-Ray Imaging and Spectroscopy Mission (XRISM) is an x-ray astronomical mission led by the Japan Aerospace Exploration Agency (JAXA) and National Aeronautics and Space Administration (NASA), with collaboration from the European Space Agency (ESA) and other international participants, that is planned for launch in 2022 (Japanese fiscal year), to quickly restore high-resolution x-ray spectroscopy of astrophysical objects using the microcalorimeter array after the loss of Hitomi satellite. In order to enhance the scientific outputs of the mission, the Science Operations Team (SOT) is structured independently from the Instrument Teams (ITs) and the Mission Operations Team. The responsibilities of the SOT are divided into four categories: (1) guest observer program and data distributions, (2) distribution of analysis software and the calibration database, (3) guest observer support activities, and (4) performance

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“…Soft X-ray Telescope -I Soft X-ray Telescope -S Hard X-ray Telescope Figure 1: Overview of the Hitomi observatory scope (HXT: [4,5,6]) are mounted on top of the optical bench. The SXT and HXT have equivalent two modules each.…”

Section: Extensible Optical Benchmentioning

confidence: 99%

The scientific results from the X-ray observatory Hitomi

Ishida¹

2020

Proceedings of Multifrequency Behaviour of High Energy Cosmic Sources - XIII — PoS(MULTIF2019)

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Hitomi is the 6th Japanese X-ray astronomy satellite launched on 2016 Feb 17. Although it was unfortunately lost about 1 month from the launch, Hitomi produced many new scientific results, owing to extremely high spectral resolution of the non-dispersive SXS detector (X-ray microcalorimeter). From the observations of the Perseus cluster, a stringent upper limit of the turbulent pressure, only <7% of that of the thermal pressure, is obtained, and the metal abundance in ICM is found consistent to that of the solar vicinity. Power of the high resolution spectroscopy even with small photon counts is demonstrated in N132D and IGR J16318-4848. Emission/absorption line search was performed in Crab and G21.5−0.9. A result is obtained to support that the Crab nebula was born from an electron-capture supernova. New absorption line structures are detected from G21.5−0.9, although they need further confirmation because of low statistical significance of 3-4σ. To fulfill the calorimeter science, the XRISM project has been ongoing. Following XRISM, we have started preparing the next generation hard X-ray mission FORCE that is a successor of the hard X-ray imager onboard Hitomi, but with much better spatial resolution of 15 arcsec in HPD. They are planned to be launched by the end of March 2022 and late 2020's, respectively.

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On-ground calibration of the Hitomi Hard X-ray Telescopes

Cited by 11 publications

References 27 publications

In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)

In-orbit performance and calibration of the Hard X-ray Imager onboard Hitomi (ASTRO-H)

Detailed design of the science operations for the XRISM mission

The scientific results from the X-ray observatory Hitomi

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