Masahiro Tsujimoto Misaki Mizumoto Ken Ebisawa Hirokazu Odaka Qazuya Wada
Astrophysical Journal 960(1) 2024年1月
Supersoft X-ray sources (SSSs) are white dwarf (WD) binaries that radiate almost entirely below ∼1 keV. Their X-ray spectra are often complex when viewed with the X-ray grating spectrometers, where numerous emission and absorption features are int...
Mayu Tominaga Masahiro Tsujimoto Ken Ebisawa Teruaki Enoto Kimitake Hayasaki
Astrophysical Journal 958(1) 2023年11月
Circinus X-1 (Cir X-1) is a neutron star binary with an elliptical orbit of 16.6 days. The source is unique for its extreme youth, providing a key to understanding early binary evolution. However, its X-ray variability is too complex to reach a cl...
R. Imamura H. Awaki M. Tsujimoto S. Yamada F. S. Porter C. A. Kilbourne R. L. Kelley Y. Takei
Journal of Low Temperature Physics 211(5-6) 426-433 2023年6月
Low-temperature detectors often use mechanical coolers as part of the cooling chain in order to reach sub-Kelvin operating temperatures. The microphonic noise caused by the mechanical coolers is a general and inherent issue for these detectors. We...
Tomoki Omama Masahiro Tsujimoto Ken Ebisawa Misaki Mizumoto
Astrophysical Journal 945(2) 2023年3月
MAXI J1820+070 is a transient black hole binary discovered on 2018 March 11. The unprecedented rich statistics brought by the NICER X-ray telescope allow detailed timing analyses up to ∼1 kHz uncompromised by photon shot noise. To estimate the tim...
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 75(1) 177-186 2023年2月
gamma Cas analog sources are a subset of Be stars that emit intense and hard X-ray emission. Two competing ideas for their X-ray production mechanism are (a) the magnetic activities of the Be star and its disk and (b) the accretion from the Be sta...
竹井 洋 満田 和久 山崎 典子 辻本 匡弘 篠崎 慶亮 杉田 寛之 佐藤 洋一 藤本 龍一 佐藤 浩介 大橋 隆哉 石崎 欣尚 江副 祐一郎 村上 正秀 田代 信 寺田 幸功 玉川 徹 三原 建弘 川原田 円 山口 弘悦 北本 俊二 村上 弘志 Kelley Richard L. Kilbourne C. A. Porter F. S. Shirron P. J. DiPirro M. J. Sneiderman Gary A. McCammon D. Herder J.-W. den ASTRO-H SXSチーム
M Kohno K Imanishi A Bamba M Tsujimoto H Murakami T Tsuru K Koyama
X-RAY AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY XII 4497 149-157 2002年 [査読有り]
We study the relation between diffusion and loss of charge produced in X-ray CCDs with the fitting method. We obtain the extent and the pulse height of each X-ray event in a CCD by a two-dimensional image-fitting the charge distribution of the eve...
M Tsujimoto H Murakami K Hamaguchi TG Tsuru H Awaki K Koyama
X-RAY AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY XI 4140 470-477 2000年 [査読有り]
CCDs can function as the X-ray spectrometer by counting the number of electrons created by the ionization of semiconductor atoms following the photoelectric absorption of a X-ray photon. In order to measure the incident X-ray energy correctly, we ...
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