Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes

Hideyuki Mori, Yoshito Haba, Takuya Miyazawa, Akihiro Furuzawa, Yuzuru Tawara, Hideyo Kunieda, Shigeo Yamauchi, Hisamitsu Awaki, Manabu Ishida, Yoshitomo Maeda, Aya Bamba, Ryo Iizuka, Takashi Okajima, Richard Mushotzky

研究成果: Conference contribution

9 引用 (Scopus)

抜粋

We present the current status of the pre-collimator for the stray-light reduction, mounted on the ASTRO-H X-Ray Telescopes (XRT). Since the ASTRO-H XRTs adopt the conical approximation of the Wolter-I type grazing incident optics, X-rays from a source located far from the telescope boresight create a ghost image in the detector field of view (FOV) as a stray light, and then reduce the signal-to-noise ratio even in the hard X-ray band. We thus plan to mount the pre-collimator, which is comprised of cylindrical blades aligned with each primary mirror, onto the XRTs to remove the stray light. While the pre-collimator for the Soft X-ray Telescopes is designed by the similar principle adopted for the Suzaku pre-collimator, that for the Hard X-ray Telescopes requires some trade-off studies to select an appropriate blade material. The HXT pre-collimator currently utilizes the aluminum blade with the 50 mm height and 150 μm thickness. We examined the observational effects by the hard X-ray (> 10 keV) stray light and the expected performance of the pre-collimator in some scientific cases, using a ray-tracing simulator. We found that the Galactic center may be mostly covered with the stray light from the well-known bright X-ray sources. In addition, the flux estimation of the extended X-ray emission such as the Cosmic X-ray Background is also found to have large (∼ 30%) uncertainty due to the stray light from the outside of the XRT FOV. The pre-collimator improves the situations; the stray light covering the source-free region in the Galactic center can be reduced by half and the uncertainty of the flux determination for the diffuse source decreases down to < 10%.

元の言語English
ホスト出版物のタイトルSpace Telescopes and Instrumentation 2010
ホスト出版物のサブタイトルUltraviolet to Gamma Ray
DOI
出版物ステータスPublished - 19-10-2010
外部発表Yes
イベントSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray - San Diego, CA, United States
継続期間: 28-06-201002-07-2010

出版物シリーズ

名前Proceedings of SPIE - The International Society for Optical Engineering
7732
ISSN(印刷物)0277-786X

Other

OtherSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
United States
San Diego, CA
期間28-06-1002-07-10

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

フィンガープリント Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用

    Mori, H., Haba, Y., Miyazawa, T., Furuzawa, A., Tawara, Y., Kunieda, H., Yamauchi, S., Awaki, H., Ishida, M., Maeda, Y., Bamba, A., Iizuka, R., Okajima, T., & Mushotzky, R. (2010). Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes. : Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray [77323E] (Proceedings of SPIE - The International Society for Optical Engineering; 巻数 7732). https://doi.org/10.1117/12.856803