X–ray telescope onboard astro–E. II. Ground–based x–ray characterization

Ryo Shibata, Manabu Ishida, Hideyo Kunieda, Takao Endo, Hirohiko Honda, Kazutami Misaki, Jun’ichi Ishida, Kohsuke Imamura, Yasuhiro Hidaka, Masamichi Maeda, Yuzuru Tawara, Yasushi Ogasaka, Akihiro Furuzawa, Manabu Watanabe, Yuichi Terashima, Tsutomu Yoshioka, Takashi Okajima, Koujun Yamashita, Peter J. Serlemitsos, Yang SoongKai Wing Chan

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


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 cm2 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 × 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.

Original languageEnglish
Pages (from-to)3762-3783
Number of pages22
JournalApplied Optics
Issue number22
Publication statusPublished - 01-08-2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


Dive into the research topics of 'X–ray telescope onboard astro–E. II. Ground–based x–ray characterization'. Together they form a unique fingerprint.

Cite this