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First Peek of ASTRO-H Soft X-Ray Telescope (SXT) In-Orbit Performance
External Online Source: doi:10.1117/12.2231705
Author and Affiliation:
Okajima, Takashi(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Soong, Yang(Maryland Univ., College Park, MD, United States);
Serlemitsos, Peter J.(NASA Goddard Space Flight Center, Greenbelt, MD, United States);
Mori, Hideyuki(Maryland Univ. Baltimore County, Baltimore, MD, United States);
Olsen, Lawrence(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Robinson, David(NASA Goddard Space Flight Center, Greenbelt, MD United States);
Chang, William(Edge Space Systems, Glenelg, MD, United States);
Ishida, Manabu(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Kikuchi, Naomichi(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Kurashima, Sho(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Nakaniwa, Nozomi(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Hayashi, Takayuki(Tokyo Inst. of Tech., Tokyo, Japan);
Tachibana, Kenji(Tokyo Inst. of Tech., Tokyo, Japan);
Furuzawa, Akihiro(Tokyo Inst. of Tech., Tokyo, Japan);
Koenecke, Richard(Adnet Systems, Inc., Greenbelt, MD, United States);
Hahne, David(NASA Langley Research Center, Hampton, VA United States);
Iisuka, Ryo(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Maeda, Yoshitomo(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Sato, Toshiki(Japan Aerospace Exploration Agency, Inst. of Space and Aeronautical Science, Kanagawa, Japan);
Ishibashi, Kazunori(Tokyo Inst. of Tech., Tokyo, Japan);
Miyazawa, Takuya(Tokyo Inst. of Tech., Tokyo, Japan);
Tamura, Keisuke(Tokyo Inst. of Tech., Tokyo, Japan);
Tawara, Yuzuru(Tokyo Inst. of Tech., Tokyo, Japan);
Sugita, Satoshi(Tokyo Inst. of Tech., Tokyo, Japan)
Abstract: 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 the NASA 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 beam line at ISAS/JAXA. The combined SXT+SXS system effective area is about 250 and 300 cm(exp 2) 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 cm (exp 2) 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 x 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 cm(exp 2)/kg, among ASTRO-H, Chandra, and XMM-Newton mirrors. The aluminum foil mirror is a still compelling technology depending on the mission science goal.
Publication Date: Jul 19, 2016
Document ID:
20170006117
(Acquired Jul 14, 2017)
Subject Category: ASTROPHYSICS
Report/Patent Number: GSFC-E-DAA-TN43824
Document Type: Conference Paper
Publication Information: SPIE Proceedings (ISSN 0277-786X); Volume 9905; 99050Z
Publisher Information: SPIE
Meeting Information: Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray; 26 Jun. 2016; Edinburgh; United Kingdom
Contract/Grant/Task Num: NNG12PL17C; NNG15CR64C; NNG17PT01A
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: X RAY TELESCOPES; ASTROPHYSICS; MIRRORS; X RAY OPTICS; GROUND TESTS; X RAY IMAGERY; IMAGE RESOLUTION; ANGULAR RESOLUTION; X RAYS; VIGNETTING; FIELD OF VIEW; POINT SOURCES
Other Descriptors: ASTRO-H; HITOMI; X-RAYS; X-RAY TELESCOPE; X-RAY MIRROR; X-RAY OPTICS; SOFT X-RAYS
Availability Source: Other Sources
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