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Proceedings Paper

In-flight verification of the calibration and performance of the ASTRO-H (Hitomi) Soft X-Ray Spectrometer
Author(s): Maurice A. Leutenegger; Marc Audard; Kevin R. Boyce; Gregory V. Brown; Meng P. Chiao; Megan E. Eckart; Ryuichi Fujimoto; Akihiro Furuzawa; Matteo Guainazzi; Daniel Haas; Jan-Willem den Herder; Takayuki Hayashi; Ryo Iizuka; Manabu Ishida; Yoshitaka Ishisaki; Richard L. Kelley; Naomichi Kikuchi; Caroline A. Kilbourne; Shu Koyama; Sho Kurashima; Yoshitomo Maeda; Maxim Markevitch; Dan McCammon; Kazuhisa Mitsuda; Hideyuki Mori; Nozomi Nakaniwa; Takashi Okajima; Stéphane Paltani; Robert Petre; F. Scott Porter; Kosuke Sato; Toshiki Sato; Makoto Sawada; Peter J. Serlemitsos; Hiromi Seta; Gary Sneiderman; Yang Soong; Satoshi Sugita; Andrew E. Szymkowiak; Yoh Takei; Makoto Tashiro; Yuzuru Tawara; Masahiro Tsujimoto; Cor P. de Vries; Tomomi Watanabe; Shinya Yamada; Noriko Yamasaki
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Paper Abstract

The Soft X-ray Spectrometer (SXS) onboard the Astro-H (Hitomi) orbiting x-ray observatory featured an array of 36 silicon thermistor x-ray calorimeters optimized to perform high spectral resolution x-ray imaging spectroscopy of astrophysical sources in the 0.3-12 keV band. Extensive pre- flight calibration measurements are the basis for our modeling of the pulse-height-energy relation and energy resolution for each pixel and event grade, telescope collecting area, detector efficiency, and pulse arrival time. Because of the early termination of mission operations, we needed to extract the maximum information from observations performed only days into the mission when the onboard calibration sources had not yet been commissioned and the dewar was still coming into thermal equilibrium, so our technique for reconstructing the per-pixel time-dependent pulse-height-energy relation had to be modified. The gain scale was reconstructed using a combination of an absolute energy scale calibration at a single time using a fiducial from an onboard radioactive source, and calibration of a dominant time-dependent gain drift component using a dedicated calibration pixel, as well as a residual time-dependent variation using spectra from the Perseus cluster of galaxies. The energy resolution was also measured using the onboard radioactive sources. It is consistent with instrument-level measurements accounting for the modest increase in noise due to spacecraft systems interference. We use observations of two pulsars to validate our models of the telescope area and detector efficiency, and to derive a more accurate value for the thickness of the gate valve Be window, which had not been opened by the time mission operations ceased. We use observations of the Crab pulsar to refine the pixel-to-pixel timing and validate the absolute timing.

Paper Details

Date Published: 26 July 2016
PDF: 12 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99053U (26 July 2016); doi: 10.1117/12.2234230
Show Author Affiliations
Maurice A. Leutenegger, NASA Goddard Space Flight Ctr. (United States)
CRESST, Univ. of Maryland, Baltimore County (United States)
Marc Audard, Univ. of Geneva (Switzerland)
Kevin R. Boyce, NASA Goddard Space Flight Ctr. (United States)
Gregory V. Brown, Lawrence Livermore National Lab. (United States)
Meng P. Chiao, NASA Goddard Space Flight Ctr. (United States)
CRESST, Univ. of Maryland, Baltimore County (United States)
Megan E. Eckart, NASA Goddard Space Flight Ctr. (United States)
Ryuichi Fujimoto, Kanazawa Univ. (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Matteo Guainazzi, Institute of Space and Astronautical Science (Japan)
Daniel Haas, SRON Netherlands Institute for Space Research (Netherlands)
Jan-Willem den Herder, SRON Netherlands Institute for Space Research (Netherlands)
Takayuki Hayashi, NASA Goddard Space Flight Ctr. (United States)
Nagoya Univ. (Japan)
Ryo Iizuka, Institute of Space and Astronautical Science (Japan)
Manabu Ishida, Institute of Space and Astronautical Science (Japan)
Yoshitaka Ishisaki, Tokyo Metropolitan Univ. (Japan)
Richard L. Kelley, NASA Goddard Space Flight Ctr. (United States)
Naomichi Kikuchi, Institute of Space and Astronautical Science (Japan)
Caroline A. Kilbourne, NASA Goddard Space Flight Ctr. (United States)
Shu Koyama, Institute of Space and Astronautical Science (Japan)
Sho Kurashima, Institute of Space and Astronautical Science (Japan)
Yoshitomo Maeda, Institute of Space and Astronautical Science (Japan)
Maxim Markevitch, NASA Goddard Space Flight Ctr. (United States)
Dan McCammon, Univ. of Wisconsin (United States)
Kazuhisa Mitsuda, Institute of Space and Astronautical Science (Japan)
Hideyuki Mori, NASA Goddard Space Flight Ctr. (United States)
Nozomi Nakaniwa, Institute of Space and Astronautical Science (Japan)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)
Stéphane Paltani, Univ. of Geneva (Switzerland)
Robert Petre, NASA Goddard Space Flight Ctr. (United States)
F. Scott Porter, NASA Goddard Space Flight Ctr. (United States)
Kosuke Sato, Tokyo Univ. of Science (Japan)
Toshiki Sato, Institute of Space and Astronautical Science (Japan)
Makoto Sawada, Aoyama Gakuin Univ. (Japan)
Peter J. Serlemitsos, NASA Goddard Space Flight Ctr. (United States)
Hiromi Seta, Tokyo Metropolitan Univ. (Japan)
Gary Sneiderman, NASA Goddard Space Flight Ctr. (United States)
Yang Soong, NASA Goddard Space Flight Ctr. (United States)
Satoshi Sugita, Tokyo Institute of Technology (Japan)
Andrew E. Szymkowiak, Yale Univ. (United States)
Yoh Takei, Institute of Space and Astronautical Science (Japan)
Makoto Tashiro, Saitama Univ. (Japan)
Yuzuru Tawara, Nagoya Univ. (Japan)
Masahiro Tsujimoto, Institute of Space and Astronautical Science (Japan)
Cor P. de Vries, SRON Netherlands Institute for Space Research (Netherlands)
Tomomi Watanabe, NASA Goddard Space Flight Ctr. (United States)
Shinya Yamada, Tokyo Metropolitan Univ. (Japan)
Noriko Yamasaki, Institute of Space and Astronautical Science (Japan)


Published in SPIE Proceedings Vol. 9905:
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Tadayuki Takahashi; Marshall Bautz, Editor(s)

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