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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)

Abstract

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%.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2010
Subtitle of host publicationUltraviolet to Gamma Ray
Volume7732
DOIs
Publication statusPublished - 19-10-2010
Externally publishedYes
EventSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray - San Diego, CA, United States
Duration: 28-06-201002-07-2010

Other

OtherSpace Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
CountryUnited States
CitySan Diego, CA
Period28-06-1002-07-10

Fingerprint

X-ray Telescopes
Stray Light
Stray light
collimators
Telescopes
telescopes
X rays
Hard X-ray
Blade
x rays
blades
Field of View
X-ray Optics
Uncertainty
field of view
Soft X-ray
X ray optics
Ray Tracing
Fluxes
boresights

All Science Journal Classification (ASJC) codes

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

Cite this

Mori, H., Haba, Y., Miyazawa, T., Furuzawa, A., Tawara, Y., Kunieda, H., ... Mushotzky, R. (2010). Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes. In Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray (Vol. 7732). [77323E] https://doi.org/10.1117/12.856803
Mori, Hideyuki ; Haba, Yoshito ; Miyazawa, Takuya ; Furuzawa, Akihiro ; Tawara, Yuzuru ; Kunieda, Hideyo ; Yamauchi, Shigeo ; Awaki, Hisamitsu ; Ishida, Manabu ; Maeda, Yoshitomo ; Bamba, Aya ; Iizuka, Ryo ; Okajima, Takashi ; Mushotzky, Richard. / Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes. Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. Vol. 7732 2010.
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abstract = "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{\%}.",
author = "Hideyuki Mori and Yoshito Haba and Takuya Miyazawa and Akihiro Furuzawa and Yuzuru Tawara and Hideyo Kunieda and Shigeo Yamauchi and Hisamitsu Awaki and Manabu Ishida and Yoshitomo Maeda and Aya Bamba and Ryo Iizuka and Takashi Okajima and Richard Mushotzky",
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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. in Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. vol. 7732, 77323E, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, San Diego, CA, United States, 28-06-10. https://doi.org/10.1117/12.856803

Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes. / Mori, Hideyuki; Haba, Yoshito; Miyazawa, Takuya; Furuzawa, Akihiro; Tawara, Yuzuru; Kunieda, Hideyo; Yamauchi, Shigeo; Awaki, Hisamitsu; Ishida, Manabu; Maeda, Yoshitomo; Bamba, Aya; Iizuka, Ryo; Okajima, Takashi; Mushotzky, Richard.

Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. Vol. 7732 2010. 77323E.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes

AU - Mori, Hideyuki

AU - Haba, Yoshito

AU - Miyazawa, Takuya

AU - Furuzawa, Akihiro

AU - Tawara, Yuzuru

AU - Kunieda, Hideyo

AU - Yamauchi, Shigeo

AU - Awaki, Hisamitsu

AU - Ishida, Manabu

AU - Maeda, Yoshitomo

AU - Bamba, Aya

AU - Iizuka, Ryo

AU - Okajima, Takashi

AU - Mushotzky, Richard

PY - 2010/10/19

Y1 - 2010/10/19

N2 - 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%.

AB - 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%.

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Mori H, Haba Y, Miyazawa T, Furuzawa A, Tawara Y, Kunieda H et al. Current status of the pre-collimator development for the ASTRO-H X-ray Telescopes. In Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray. Vol. 7732. 2010. 77323E https://doi.org/10.1117/12.856803