In-flight calibration of the Hitomi Soft X-ray Spectrometer. (2) Point spread function

Yoshitomo Maeda, Toshiki Sato, Takayuki Hayashi, Ryo Iizuka, Lorella Angelini, Ryota Asai, Akihiro Furuzawa, Richard Kelley, Shu Koyama, Sho Kurashima, Manabu Ishida, Hideyuki Mori, Nozomi Nakaniwa, Takashi Okajima, Peter J. Serlemitsos, Masahiro Tsujimoto, Tahir Yaqoob

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We present results of inflight calibration of the point spread function of the Soft X-ray Telescope that focuses X-rays onto the pixel array of the Soft X-ray Spectrometer system. We make a full array image of a point-like source by extracting a pulsed component of the Crab nebula emission. Within the limited statistics afforded by an exposure time of only 6.9 ks and limited knowledge of the systematic uncertainties, we find that the raytracing model of 1.2 half-power-diameter is consistent with an image of the observed event distributions across pixels. The ratio between the Crab pulsar image and the raytracing shows scatter from pixel to pixel that is 40% or less in all except one pixel. The pixel-to-pixel ratio has a spread of 20%, on average, for the 15 edge pixels, with an averaged statistical error of 17% (1 σ). In the central 16 pixels, the corresponding ratio is 15% with an error of 6%.

Original languageEnglish
Article numberpsx146
JournalPublications of the Astronomical Society of Japan
Issue number2
Publication statusPublished - 01-03-2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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