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Proceedings Paper

Reflectivity around the gold M-edges of x-ray reflector of the Soft X-ray Telescope onboard ASTRO-H
Author(s): Sho Kurashima; Akihiro Furuzawa; Toshiki Sato; Naomichi Kikuchi; Nozomi Nakaniwa; Yoshitomo Maeda; Manabu Ishida; Ryo Iizuka; Takashi Okajima; Hideyuki Mori; Hironori Matsumoto; Keisuke Tamura; Kazunori Ishibashi; Takayuki Hayashi; Takuya Miyazawa; Masato Maejima; Shun Yoshikawa
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Paper Abstract

The X-ray astronomy satellite ASTRO-H are equipped with two equivalent soft X-ray telescopes (SXT-I and SXT-S) which cover the energy band 0.3{12 keV. The X-ray reflectors of the SXTs are coated with a gold monolayer by means of the replication technique (Okajima et al. in this volume). A series of gold M absorption edges in the 2-4 keV band causes complex structures in the energy response of the SXTs. In the same band, there are astrophysically important emission lines from Si, Ar and S. Since the SXS has unprecedentedly high spectral resolution, we have measured the reflectivity around the gold M-edges in an extremely fine energy pitch at the synchrotron radiation facility KEK PF BL11-B, with the 2 eV pitch in 2100 eV to 4100 eV band that covers the entire series of the absorption edges (M-I through M-V) at grazing incident angles to the reflectors of 0.5, 0.8, 1.0, 1.2, 1.4 degree, and with a finer pitch of 0.25 eV in the 2200 eV to 2350 eV band where the two deepest M-IV and M-V edges are included. In the resultant reflectivity curves, we have clearly identified the fine structures associated with all the M-edges. Using these data, we calculated atomic scattering factor f1 as a function of X-ray energy, with which we have built the mirror response function which can be applied to the Suzaku spectra. As a result, we have found that discrepancy of the spectral model to the Suzaku data of 4U1630-472 (a black hole transient) and the Crab nebula around the M-edges are significantly reduced from those with the official Suzaku response.

Paper Details

Date Published: 11 July 2016
PDF: 10 pages
Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray, 99053Y (11 July 2016); doi: 10.1117/12.2231173
Show Author Affiliations
Sho Kurashima, Tokyo Metropolitan Univ. (Japan)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Toshiki Sato, Tokyo Metropolitan Univ. (Japan)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Naomichi Kikuchi, Tokyo Metropolitan Univ. (Japan)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Nozomi Nakaniwa, Tokyo Metropolitan Univ. (Japan)
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Yoshitomo Maeda, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Manabu Ishida, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Ryo Iizuka, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)
Hideyuki Mori, NASA Goddard Space Flight Ctr. (United States)
Hironori Matsumoto, Nagoya Univ. (Japan)
Keisuke Tamura, Nagoya Univ. (Japan)
Kazunori Ishibashi, Nagoya Univ. (Japan)
Takayuki Hayashi, Nagoya Univ. (Japan)
NASA Goddard Space Flight Ctr. (United States)
Takuya Miyazawa, Nagoya Univ. (Japan)
Masato Maejima, Nagoya Univ. (Japan)
Shun Yoshikawa, Nagoya Univ. (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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