In-flight calibration of Hitomi Soft X-ray Spectrometer. (3) Effective area

被引:15
|
作者
Tsujimoto, Masahiro [1 ]
Okajima, Takashi [2 ]
Eckart, Megan E. [2 ]
Hayashi, Takayuki [2 ,3 ]
Hoshino, Akio [2 ]
Iizuka, Ryo [1 ]
Kelley, Richard L. [2 ]
Kilbourne, Caroline A. [2 ]
Leutenegger, Maurice A. [2 ,4 ]
Maeda, Yoshitomo [1 ]
Mori, Hideyuki [1 ,2 ]
Porter, Frederick S. [2 ]
Sato, Kosuke [5 ]
Sato, Toshiki [1 ,6 ]
Serlemitsos, Peter J. [2 ]
Szymkowiak, Andrew [7 ]
Yaqoob, Tahir [2 ,4 ]
机构
[1] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, 3-1-1 Yoshino Dai, Sagamihara, Kanagawa 2525210, Japan
[2] NASA, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA
[3] Nagoya Univ, Dept Phys, Chikusa Ku, Furocho, Nagoya, Aichi 4648602, Japan
[4] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA
[5] Tokyo Univ Sci, Dept Phys, Shinjuku Ku, 1-3 Kagurazaka, Tokyo 1628601, Japan
[6] Tokyo Metropolitan Univ, Dept Phys, 1-1 Minami Osawa, Hachioji, Tokyo 1920397, Japan
[7] Yale Univ, Dept Phys, New Haven, CT 06520 USA
关键词
instrumentation: spectrographs; methods: observational; space vehicles: instruments; SPECTROSCOPY; SPECTRUM;
D O I
10.1093/pasj/psy008
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present the result of the in-flight calibration of the effective area of the Soft X-ray Spectrometer (SXS) on board the Hitomi X-ray satellite using an observation of the Crab nebula. We corrected for artifacts when observing high count rate sources with the Xray microcalorimeter. We then constructed a spectrum in the 0.5-20 keV band, which we modeled with a single power-law continuum attenuated by interstellar extinction. We evaluated the systematic uncertainty of the spectral parameters by various calibration items. In the 2-12 keV band, the SXS result is consistent with the literature values in flux (2.20 +/- 0.08 x 10(-8) erg s(-1) cm(-2) with a 1 sigma statistical uncertainty) but is softer in the power-law index (2.19 +/- 0.11). The discrepancy is attributable to the systematic uncertainty of about +6%/-7% and +2%/-5% respectively for the flux and the power-law index. The softer spectrum is affected primarily by the systematic uncertainty of the Dewar gate valve transmission and the event screening.
引用
收藏
页数:13
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