In-flight calibration of the Hitomi Soft X-ray Spectrometer. (2) Point spread function. (11th April 2018)

• Record Type: Journal Article
• Authors: Maeda, Yoshitomo; Sato, Toshiki; Hayashi, Takayuki; Iizuka, Ryo; Angelini, Lorella; Asai, Ryota; Furuzawa, Akihiro; Kelley, Richard; Koyama, Shu; Kurashima, Sho; Ishida, Manabu; Mori, Hideyuki; Nakaniwa, Nozomi; Okajima, Takashi; Serlemitsos, Peter J; Tsujimoto, Masahiro; Yaqoob, Tahir
• Is Part Of: Publications of the Astronomical Society of Japan. Volume 70(2018)Supplement 2
• Publication Date: 2018-04-11
• Subjects: space vehicles: instruments -- techniques: imaging spectroscopy -- telescopes; Astronomy -- Periodicals; 520.5
• DOI: 10.1093/pasj/psx146
• Languages: English
• ISSNs: 0004-6264

Abstract

Abstract: 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$ {^{\prime}_{.}} $ 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%.