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Proceedings Paper

Development of cosmic x-ray polarimeter
Author(s): Asami Hayato; Toru Tamagawa; Naoko Tsunoda; Shigehira Hashimoto; Masao Miyamoto; Mitsuhiro Kohama; Fuyuki Tokanai; Hideki Hamagaki; Masahide Inuzuka; Hiromasa Miyasaka; Ikuya Sakurai; Kazuo Makishima
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Paper Abstract

We present a performance study of a cosmic X-ray polarimeter which is based on the photoelectric effect in gas, and sensitive to a few to 30 keV range. In our polarimeter, the key device would be the 50 μm pitch Gas Electron Multiplier (GEM). We have evaluated the modulation factor using highly polarized X-ray, provided by a synchrotron accelerator. In the analysis, we selected events by the eccentricity of the charge cloud of the photoelectron track. As a result, we obtained the relationship between the selection criteria for the eccentricity and the modulation factors; for example, when we selected the events which have their eccentricity of > 0.95, the polarimeter exhibited with the modulation factor of 0.32. In addition, we estimated the Minimum Detectable Polarization degree (MDP) of Crab Nebula with our polarimeter and found 10 ksec observation is enough to detect the polarization, if we adopt suitable X-ray mirrors.

Paper Details

Date Published: 15 June 2006
PDF: 11 pages
Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, 62663X (15 June 2006); doi: 10.1117/12.671242
Show Author Affiliations
Asami Hayato, Tokyo Univ. of Science (Japan)
RIKEN (Japan)
Toru Tamagawa, RIKEN (Japan)
Tokyo Univ. of Science (Japan)
Naoko Tsunoda, Tokyo Univ. of Science (Japan)
RIKEN (Japan)
Shigehira Hashimoto, Tokyo Univ. of Science (Japan)
RIKEN (Japan)
Masao Miyamoto, Tokyo Univ. of Science (Japan)
RIKEN (Japan)
Mitsuhiro Kohama, Tokyo Univ. of Science (Japan)
Fuyuki Tokanai, Yamagata Univ. (Japan)
Hideki Hamagaki, Univ. of Tokyo (Japan)
Masahide Inuzuka, National Research Institute for Cultural Properties (Japan)
Hiromasa Miyasaka, California Institute of Technology (United States)
Ikuya Sakurai, Nagoya Univ. (Japan)
Kazuo Makishima, Univ. of Tokyo (Japan)
RIKEN (Japan)

Published in SPIE Proceedings Vol. 6266:
Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray
Martin J. L. Turner; Günther Hasinger, Editor(s)

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