In-flight calibration and detector response matrices for WXM/HETE-2
著者
和文:
Nakagawa, Y. E.,
Yamazaki, T.,
Sakamoto, T.,
Yoshida, A.,
河合 誠之,
Tamagawa, T.,
Shirasaki, Y.,
Torii, K.,
Suzuki, M.,
Matsuoka, M.,
Fenimore, E. E.,
Galassi, M.,
Hete-2 Wxm Team..
英文:
Nakagawa, Y. E.,
Yamazaki, T.,
Sakamoto, T.,
Yoshida, A.,
Kawai, N.,
Tamagawa, T.,
Shirasaki, Y.,
Torii, K.,
Suzuki, M.,
Matsuoka, M.,
Fenimore, E. E.,
Galassi, M.,
Hete-2 Wxm Team..
The HETE-2 carries the Wide-field X-ray Monitor (WXM) which consists of four identical one-dimensional position-sensitive proportional counters and the electronics for signal processing. It is placed beneath two one-dimensional coded aperture masks and sensitive to X-rays from 2 to 25keV. The detector response matrices (DRMs) of the WXM is calculated numerically based on the pre-flight ground measurements for each anode wire. Since the launch of HETE-2, in-flight calibrations have been carried out utilizing data of Crab nebula. An unexpected excess appeared in low energy spectra (2-4keV) of the WXM since December 2002. We found the excess being on an increasing trend. It is possibly explained by a gradual loss of the aluminum-coated Kapton film which covers the coded masks. We developed the new DRMs generator based on the variation of the thickness of aluminum-coated Kapton film.
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