In-flight calibration of Hitomi Soft X-ray Spectrometer. (1) Background

PASJ: Publications of the Astronomical Society of Japan

Sawada, Makoto¹  Yamasaki, Noriko Y²  Yamada, Shinya²  Tashiro, Makoto S³  Ishisaki, Yoshitaka³  Nakashima, Shinya⁴  Fujimoto, Ryuichi⁵  Seta, Hiromi⁶  Koyama, Shu⁷  Terada, Yukikatsu⁷  Tsujimoto, Masahiro⁷  Porter, Frederick S⁷  Eckart, Megan E⁸  Kilbourne, Caroline A⁸  Leutenegger, Maurice A⁸  Kelley, Richard L⁸  Boyce, Kevin R⁸  McCammon, Dan⁸  Angellini, Lorella⁸  Takei, Yoh⁸  Loewenstein, Michael⁹  Mitsuda, Kazuhisa^1,10 

[1] Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan;Department of Physics, Saitama University, Sakura-ku, Saitama, Saitama 338-8570, Japan;Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan;Department of Physics, University of Wisconsin, Madison, WI 53706, USA;Faculty of Mathematics and Physics, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan;Institute of Physical and Chemical Research, Wako, Saitama 351-0198, Japan;Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA;University of Maryland – Baltimore County, Baltimore, MD 21250, USA;University of Maryland, College Park, MD 20742, USA

关键词: instrumentation: spectrographs;    methods: observational;    space vehicles: instruments;   

DOI  :  10.1093/pasj/psx139

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

The X-Ray Spectrometer (XRS) instrument of Suzaku provided the first measurement of the non-X-ray background (NXB) of an X-ray calorimeter spectrometer, but the data set was limited. The Soft X-ray Spectrometer (SXS) instrument of Hitomi was able to provide a more detailed picture of X-ray calorimeter background, with more than 360 ks of data while pointed at the Earth, and a comparable amount of blank-sky data. These data are important not only for analyzing SXS science data, but also for categorizing the contributions to the NXB in X-ray calorimeters as a class. In this paper, we present the contributions to the SXS NXB, the types and effectiveness of the screening, the interaction of the screening with the broad-band redistribution, and the residual background spectrum as a function of magnetic cut-off rigidity. The orbit-averaged SXS NXB in the range 0.3–12 keV was 4 × 10−2 counts s−1 cm−2. This very low background in combination with groundbreaking spectral resolution gave SXS unprecedented sensitivity to weak spectral lines.

【 授权许可】

CC BY