Abstract
Hitomi (ASTRO-H) carries two Hard X-ray Telescopes (HXTs), which can focus x-rays up to 80 keV. Combined with the hard x-ray imagers (HXIs) that detect the focused x-rays, imaging spectroscopy in the high-energy band from 5 to 80 keV is made possible. We studied characteristics of HXTs after the launch, such as the encircled energy function (EEF) and the effective area using the data of a Crab observation. The half power diameters (HPDs) in the 5- to 80-keV band evaluated from the EEFs are 1.59 arcmin for HXT-1 and 1.65 arcmin for HXT-2. Those are consistent with the HPDs measured with ground experiments when uncertainties are taken into account. We can conclude that there is no significant change in the characteristics of the HXTs before and after the launch. The off-axis angle of the aim point from the optical axis is evaluated to be <0.5 arcmin for both HXT-1 and HXT-2. The best-fit parameters for the Crab spectrum obtained with the HXT-HXI system are consistent with the canonical values.
| Original language | English |
|---|---|
| Article number | 011212 |
| Journal | Journal of Astronomical Telescopes, Instruments, and Systems |
| Volume | 4 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 01-01-2018 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Control and Systems Engineering
- Instrumentation
- Astronomy and Astrophysics
- Mechanical Engineering
- Space and Planetary Science
Cite this
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Inorbit performance of the Hard X-ray Telescope (HXT) on board the Hitomi (ASTRO-H) satellite. / Matsumoto, Hironori; Awaki, Hisamitsu; Ishida, Manabu; Furuzawa, Akihiro; Yamauchi, Shigeo; Maeda, Yoshitomo; Mitsuishi, Ikuyuki; Haba, Yoshito; Hayashi, Takayuki; Iizuka, Ryo; Ishibashi, Kazunori; Itoh, Masayuki; Kunieda, Hideyo; Miyazawa, Takuya; Mori, Hideyuki; Okajima, Takashi; Sugita, Satoshi; Tamura, Keisuke; Tawara, Yuzuru.
In: Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, No. 1, 011212, 01.01.2018.Research output: Contribution to journal › Article
TY - JOUR
T1 - Inorbit performance of the Hard X-ray Telescope (HXT) on board the Hitomi (ASTRO-H) satellite
AU - Matsumoto, Hironori
AU - Awaki, Hisamitsu
AU - Ishida, Manabu
AU - Furuzawa, Akihiro
AU - Yamauchi, Shigeo
AU - Maeda, Yoshitomo
AU - Mitsuishi, Ikuyuki
AU - Haba, Yoshito
AU - Hayashi, Takayuki
AU - Iizuka, Ryo
AU - Ishibashi, Kazunori
AU - Itoh, Masayuki
AU - Kunieda, Hideyo
AU - Miyazawa, Takuya
AU - Mori, Hideyuki
AU - Okajima, Takashi
AU - Sugita, Satoshi
AU - Tamura, Keisuke
AU - Tawara, Yuzuru
PY - 2018/1/1
Y1 - 2018/1/1
N2 - Hitomi (ASTRO-H) carries two Hard X-ray Telescopes (HXTs), which can focus x-rays up to 80 keV. Combined with the hard x-ray imagers (HXIs) that detect the focused x-rays, imaging spectroscopy in the high-energy band from 5 to 80 keV is made possible. We studied characteristics of HXTs after the launch, such as the encircled energy function (EEF) and the effective area using the data of a Crab observation. The half power diameters (HPDs) in the 5- to 80-keV band evaluated from the EEFs are 1.59 arcmin for HXT-1 and 1.65 arcmin for HXT-2. Those are consistent with the HPDs measured with ground experiments when uncertainties are taken into account. We can conclude that there is no significant change in the characteristics of the HXTs before and after the launch. The off-axis angle of the aim point from the optical axis is evaluated to be <0.5 arcmin for both HXT-1 and HXT-2. The best-fit parameters for the Crab spectrum obtained with the HXT-HXI system are consistent with the canonical values.
AB - Hitomi (ASTRO-H) carries two Hard X-ray Telescopes (HXTs), which can focus x-rays up to 80 keV. Combined with the hard x-ray imagers (HXIs) that detect the focused x-rays, imaging spectroscopy in the high-energy band from 5 to 80 keV is made possible. We studied characteristics of HXTs after the launch, such as the encircled energy function (EEF) and the effective area using the data of a Crab observation. The half power diameters (HPDs) in the 5- to 80-keV band evaluated from the EEFs are 1.59 arcmin for HXT-1 and 1.65 arcmin for HXT-2. Those are consistent with the HPDs measured with ground experiments when uncertainties are taken into account. We can conclude that there is no significant change in the characteristics of the HXTs before and after the launch. The off-axis angle of the aim point from the optical axis is evaluated to be <0.5 arcmin for both HXT-1 and HXT-2. The best-fit parameters for the Crab spectrum obtained with the HXT-HXI system are consistent with the canonical values.
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U2 - 10.1117/1.JATIS.4.1.011212
DO - 10.1117/1.JATIS.4.1.011212
M3 - Article
VL - 4
JO - Journal of Astronomical Telescopes, Instruments, and Systems
JF - Journal of Astronomical Telescopes, Instruments, and Systems
SN - 2329-4124
IS - 1
M1 - 011212
ER -