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Point Spread Function of ASTRO-H Soft X-Ray Telescope (SXT)ASTRO-H (Hitomi) satellite equips two Soft X-ray Telescopes (SXTs), one of which (SXT-S) is coupled to Soft-X-ray Spectrometer (SXS) while the other (SXT-I) is coupled to Soft X-ray Imager (SXI). Although SXTs are lightweight of approximately 42 kgmodule1 and have large on-axis effective area (EA) of approximately 450 cm(exp 2) at 4.5 keV module(sub 1) by themselves, their angular resolutions are moderate approximately 1.2 arcmin in half power diameter. The amount of contamination into the SXS FOV (3.05 times 3.05 arcmin(exp 2) from nearby sources was measured in the ground-based calibration at the beamline in Institute of Space and Astronautical Science. The contamination at 4.5 keV were measured with sources distant from the SXS center by one width of the FOV in perpendicular and diagonal directions, that is, 3 and 4.5 arcmin-off, respectively. The average EA of the contamination in the four directions with the 3 and 4.5 arcmin-off were measured to be 2 and 0.6% of the on-axis EA of 412 cm (exp) for the SXS FOV, respectively. The contamination from a source distant by two FOV widths in a diagonal direction, that is, 8.6 arcmin-off was measured to be 0.1% of the on-axis at 4.5 keV. The contamination amounts were also measured at 1.5 keV and 8.0 keV which indicated that the ratio of the contamination EA to that of on-axis hardly depended on the source energy. The off-axis SXT-I images from 4.5 to 27 arcmin were acquired at intervals of -4.5 arcmin for the SXI FOV of 38 times 38 arcmin(exp 2). The image shrinked as the off-axis angle increased. Above 13.5 arcmin of off-angle, a stray appeared around the image center in the off-axis direction. As for the on-axis image, a ring-shaped stray appeared at the edge of SXI of approximately 18 arcmin distant from the image center.
Document ID
20170006128
Document Type
Conference Paper
External Source(s)
Authors
Hayashi, Takayuki (Nagoya Univ. Nagoya, Japan)
Sato, Toshiki (Japan Aerospace Exploration Agency Sagamihara, Japan)
Kikuchi, Naomichi (Japan Aerospace Exploration Agency Sagamihara, Japan)
Iizuka, Ryo (Japan Aerospace Exploration Agency Sagamihara, Japan)
Maeda, Yoshitomo (Japan Aerospace Exploration Agency Sagamihara, Japan)
Ishida, Manabu (Japan Aerospace Exploration Agency Sagamihara, Japan)
Kurashima, Sho (Japan Aerospace Exploration Agency Sagamihara, Japan)
Nakaniwa, Nozomi (Japan Aerospace Exploration Agency Sagamihara, Japan)
Okajima, Takashi (NASA Goddard Space Flight Center Greenbelt, MD United States)
Mori, Hideyuki (Maryland Univ. Greenbelt, MD, United States)
Soong, Yang (Maryland Univ. Greenbelt, MD, United States)
Serlemitsos, Peter J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
July 6, 2017
Publication Date
July 18, 2016
Publication Information
Publication: SPIE Proceedings
Volume: 9905
ISSN: 0277-786X
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN43753
Meeting Information
Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray(Edinburgh)
Funding Number(s)
CONTRACT_GRANT: NNG17PT01A
Distribution Limits
Public
Copyright
Other
Keywords
Soft X-ray spectrometer
X-ray
Soft X-ray imager
Soft X-ray Telescope
ASTRO-H (Hitomi)