論文

査読有り
2016年

First peek of ASTRO-H Soft X-ray Telescope (SXT) in-orbit performance

Proceedings of SPIE - The International Society for Optical Engineering
  • Takashi Okajima
  • Yang Soong
  • Peter Serlemitsos
  • Hideyuki Mori
  • Larry Olsen
  • David Robinson
  • Richard Koenecke
  • Bill Chang
  • Devin Hahne
  • Ryo Iizuka
  • Manabu Ishida
  • Yoshitomo Maeda
  • Toshiki Sato
  • Naomichi Kikuchi
  • Sho Kurashima
  • Nozomi Nakaniwa
  • Takayuki Hayashi
  • Kazunori Ishibashi
  • Takuya Miyazawa
  • Kenji Tachibana
  • Keisuke Tamura
  • Akihiro Furuzawa
  • Yuzuru Tawara
  • Satoshi Sugita
  • 全て表示

9905
記述言語
英語
掲載種別
研究論文(国際会議プロシーディングス)
DOI
10.1117/12.2231705
出版者・発行元
SPIE

ASTRO-H (Hitomi) is a Japanese X-ray astrophysics satellite just launched in February, 2016, from Tanegashima, Japan by a JAXA's H-IIA launch vehicle. It has two Soft X-ray Telescopes (SXTs), among other instruments, that were developed by NASA's Goddard Space Flight Center in collaboration with ISAS/JAXA and Nagoya University. One is for an X-ray micro-calorimeter instrument (Soft X-ray Spectrometer, SXS) and the other for an X-ray CCD camera (Soft X-ray Imager, SXI), both covering the X-ray energy band up to 15 keV. The two SXTs were fully characterized at the 30-m X-ray beamline at ISAS/JAXA. The combined SXT+SXS system effective area is about 250 and 300 cm2 at 1 and 6 keV, respectively, although observations were performed with the gate valve at the dewar entrance closed, which blocks most of low energy X-rays and some of high energy ones. The angular resolution for SXS is 1.2 arcmin (Half Power Diameter, HPD). The combined SXT+SXI system effective area is about 370 and 350 cm2 at 1 and 6 keV, respectively. The angular resolution for SXI is 1.3 arcmin (HPD). The both SXTs have a field of view of about 16 arcmin (FWHM of their vignetting functions). The SXT+SXS field of view is limited to 3 × 3 arcmin by the SXS array size. In-flight data available to the SXT team was limited at the time of this conference and a point-like source data is not available for the SXT+SXS. Although due to lack of attitude information we were unable to reconstruct a point spread function of SXT+SXI, according to RXJ1856.5-3754 data, the SXT seems to be working as expected in terms of imaging capability. As for the overall effective area response for both SXT+SXS and SXT+SXI, consistent spectral model fitting parameters with the previous measurements were obtained for Crab and G21.5-0.9 data. On the other hand, their 2-10 keV fluxes differ by about 20% at this point. Calibration work is still under progress. The SXT is the latest version of the aluminum foil X-ray mirror, which is extremely light-weight and very low cost, yet produces large effective area over a wide energy-band. Its area-mass ratio is the largest, 16 cm2/kg, among ASTRO-H, Chandra, and XMM-Newton mirrors. The aluminum foil mirror is a still compelling technology depending on the mission science goal.

リンク情報
DOI
https://doi.org/10.1117/12.2231705
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000387731500024&DestApp=WOS_CPL
ID情報
  • DOI : 10.1117/12.2231705
  • ISSN : 1996-756X
  • ISSN : 0277-786X
  • SCOPUS ID : 85003545102
  • Web of Science ID : WOS:000387731500024

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