X-Ray Telescope Onboard Astro-E. II. Ground-Based X-Ray Characterization.
X-Ray Telescope Onboard Astro-E. II. Ground-Based X-Ray Characterization.
复制标题
Astro-E 上搭载的 X 射线望远镜。
DOI：
10.1364/ao.40.003762
复制
发表时间：
2001
期刊：
影响因子：
1.9
通讯作者：
Kai
中科院分区：
文献类型：
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作者：
R. Shibata;M. Ishida;H. Kunieda;Takao Endo;H. Honda;K. Misaki;J. Ishida;K. Imamura;Yasuhiro Hidaka;Masamichi Maeda;Y. Tawara;Y. Ogasaka;A. Furuzawa;Manabu Watanabe;Yuichi Terashima;T. Yoshioka;T. Okajima;K. Yamashita;P. Serlemitsos;Y. Soong;Kai
在空间和宇宙航行科学研究所（日本）的X射线束设施中，利用窄X射线笔形束进行光栅扫描，对Astro-E卫星上的X射线望远镜进行了X射线特性测量。轴上半焦度直径（HPD）评价为1.8？-两点二？与X射线能量无关。X射线成像光谱仪（XIS）的XRT轴上有效面积分别约为440、320、240和170 cm（2），能量分别为1.49、4.51、8.04和9.44 keV。X射线光谱仪（XRS）的那些大5- 10%。为反射器生产引入的复制方法显著提高了宇宙学和天体物理学高级卫星（ASCA）XRT的成像能力，其HPD为~3.6？。与ASCA相比，有效面积增加了1.5-2.5倍，取决于X射线能量，这是由于机械放大和更长的焦距。离轴HPD几乎与光轴上获得的HPD相同。视场被定义为有效面积变为轴上值的一半时的离轴角。视野的直径为~19？在1.49 keV，随着x射线能量的增加而减少，并成为~13？能量为9.44keV。测量了大离轴角30 °时的杂散光强度和杂散光在焦平面上的分布。60？在整个XIS视场（25.4 mm x 25.4 mm）中，由点状X射线源引起的杂散光的强度变为在光轴上的相同点状源的至多1%。
X-ray characterization measurements of the x-ray telescope (XRT) onboard the Astro-E satellite were carried out at the Institute of Space and Astronautical Science (Japan) x-ray beam facility by means of a raster scan with a narrow x-ray pencil beam. The on-axis half-power diameter (HPD) was evaluated to be 1.8?-2.2?, irrespective of the x-ray energy. The on-axis effective areas of the XRTs for x-ray imaging spectrometers (XISs) were approximately 440, 320, 240, and 170 cm(2) at energies of 1.49, 4.51, 8.04, and 9.44 keV, respectively. Those of the x-ray spectrometer (XRS) were larger by 5-10%. The replication method introduced for reflector production significantly improved the imaging capability of the Advanced Satellite for Cosmology and Astrophyics (ASCA) XRT, whose HPD is ~3.6?. The increase in the effective area by a factor of 1.5-2.5, depending upon the x-ray energy, compared with that of the ASCA, was brought about by mechanical scale up and longer focal lengths. The off-axis HPDs were almost the same as those obtained on the optical axis. The field of view is defined as the off-axis angle at which the effective area becomes half of the on-axis value. The diameter of the field of view was ~19? at 1.49 keV, decreasing with increasing x-ray energy, and became ~13? at 9.44 keV. The intensity of stray light and the distribution of this kind of light on the focal plane were measured at the large off-axis angles 30? and 60?. In the entire XIS field of view (25.4 mm x 25.4 mm), the intensity of the stray light caused by a pointlike x-ray source became at most 1% of the same pointlike source that was on the optical axis.