Physics – Optics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..105s&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 47, no. 1, p. 105-114
Physics
Optics
213
Mirrors, X Ray Astronomy, X Ray Detectors, X Ray Imagery, X Ray Optics, X Ray Sources, X Ray Telescopes, Angular Resolution, Astronomical Spectroscopy, Field Of View, Japanese Spacecraft
Scientific paper
The Advanced Satellite for Cosmology and Astrophysics (ASCA) instrument uses identical conical foil X-ray mirrors for its four telescopes. One of the major advantages of ASCA's telescopes is the first time ever use of X-ray imaging over a broad energy band and high throughput for conducting astronomical spectroscopy. Nested thin foil reflectors make possible a large effective area up to 10 keV, even under the tight weight restriction of the ASCA spacecraft. The expected characteristics of the ASCA mirrors are summarized based on ray tracings and pre-flight calibrations. The total effective area of four telescopes at 1 and 7 keV are approximately 1200 and 600 sq cm, respectively. The image size (half power diameter: HPD) is about 3 min. The field of view is 24 min and 16 min full width at half maximum for 1 and 7 keV, respectively. Observations of several X-ray sources from space during the performance verification phase have confirmed those performances as well as the alignment of the optical systems.
Awaki Hisamitsu
Furuzawa Akihiro
Honda Hirohiko
Itoh Masayuki
Jalota Lalit
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