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Improvements in calibration of GSO scintillators in the Suzaku Hard X-ray Detector | | Shin'ya Yamada
; Kazuo Makishima
; Kazuhiro Nakazawa
; Motohide Kokubun
; Madoka Kawaharada
; Takao Kitaguchi
; Shin Watanabe
; Hiromitsu Takahashi
; Hirofumi Noda
; Hiroyuki Nishioka
; Kazuyoshi Hiragi
; Katsuhiro Hayashi
; Kenta Nakajima
; Makoto Tashiro
; Makoto Sasano
; Sho Nishino
; Shunsuke Torii
; Soki Sakurai
; Tadayuki Takahashi
; Tsunefumi Mizuno
; Teruaki Enoto
; Takayuki Yuasa
; Takaaki Tanaka
; Tomomi Kouzu
; Toshio Nakano
; Yasushi Fukazawa
; Yukikatsu Terada
; Yasunobu Uchiyama
; Wataru Iwakiri
; HXD Collaboration
; | | Date: |
Mon, 25 Jul 2011 07:43:50 GMT (1881kb) | | Abstract: | Improvements of in-orbit calibration of GSO scintillators in the Hard X-ray
Detector on board Suzaku are reported. To resolve an apparent change of the
energy scale of GSO which appeared across the launch for unknown reasons,
consistent and thorough re-analyses of both pre-launch and in-orbit data have
been performed. With laboratory experiments using spare hardware, the pulse
height offset, corresponding to zero energy input, was found to change by ~0.5
of the full analog voltage scale, depending on the power supply. Furthermore,
by carefully calculating all the light outputs of secondaries from activation
lines used in the in-orbit gain determination, their energy deposits in GSO
were found to be effectively lower, by several percent, than their nominal
energies. Taking both these effects into account, the in-orbit data agrees with
the on-ground measurements within ~5%, without employing the artificial
correction introduced in the previous work (Kokubun et al. 2007). With this
knowledge, we updated the data processing, the response, and the auxiliary
files of GSO, and reproduced the HXD-PIN and HXD-GSO spectra of the Crab Nebula
over 12-300 keV by a broken powerlaw with a break energy of ~110 keV. | | Source: | arXiv, 1107.4857 | | Services: | Forum | Review | PDF | Favorites | |
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