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arXiv 0705.1771astro-ph
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朱雀XIS的电荷注入性能

Performance of the Charge Injection Capability of Suzaku XIS

H. Nakajima, H. Yamaguchi, H. Matsumoto, T. G. Tsuru, K. Koyama, H. Tsunemi, K. Hayashida, K. Torii, M. Namiki, S. Katsuda, M. Shoji, D. Matsuura, T. Miyauchi, … 展开作者

H. Nakajima, H. Yamaguchi, H. Matsumoto, T. G. Tsuru, K. Koyama, H. Tsunemi, K. Hayashida, K. Torii, M. Namiki, S. Katsuda, M. Shoji, D. Matsuura, T. Miyauchi, T. Dotani, M. Ozaki, H. Murakami, M. W. Bautz, S. E. Kissel, B. LaMarr, G. Y. Prigozhin

摘要:

电荷注入技术应用于朱雀星上的X射线CCD相机XIS(X射线成像光谱仪)。电荷传输效率(CTI)在每个CCD列(垂直传输通道)的电荷包注入到传输通道和随后的读出测量。本文报道了基于辐射损伤器件的电荷注入能力的地面实验和XIS的在轨测量结果。地面实验表明,对于能量为5.1keV的X射线,在特定的柱体中,电荷以91eV的半高宽色散稳定注入。该色散宽度显著小于在近似相同能量下的113eV(FWHM)的X射线事件。用电荷注入能力测量的特定色谱柱中转移期间的电荷损失量与用校准源测量的电荷损失量一致。这些结果表明,电荷注入技术可以准确地测量列相关的电荷损失,而不是校准源。与具有列平均CTI校正的那些相比,对校准源光谱的列到列CTI校正显著减小了线宽(在发射后一年的时间,平均FWHM从193eV到173eV)。此外,该方法显著地减少了校准源谱线轮廓中的低能拖尾。

英文摘要:

A charge injection technique is applied to the X-ray CCD camera, XIS (X-ray Imaging Spectrometer) onboard Suzaku. The charge transfer inefficiency (CTI) in each CCD column (vertical transfer channel) is measured by the injection of charge packets into a transfer channel and subsequent readout. This paper reports the performances of the charge injection capability based on the ground experiments using a radiation damaged device, and in-orbit measurements of the XIS. The ground experiments show that charges are stably injected with the dispersion of 91eV in FWHM in a specific column for the charges equivalent to the X-ray energy of 5.1keV. This dispersion width is significantly smaller than that of the X-ray events of 113eV (FWHM) at approximately the same energy. The amount of charge loss during transfer in a specific column, which is measured with the charge injection capability, is consistent with that measured with the calibration source. These results indicate that the charge injection technique can accurately measure column-dependent charge losses rather than the calibration sources. The column-to-column CTI correction to the calibration source spectra significantly reduces the line widths compared to those with a column-averaged CTI correction (from 193eV to 173eV in FWHM on an average at the time of one year after the launch). In addition, this method significantly reduces the low energy tail in the line profile of the calibration source spectrum.

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