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

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN | 2018年 / 70卷 / 02期

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

页数：13

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