The X-Ray Telescope onboard Suzaku

Details The X-Ray Telescope onboard Suzaku The X-Ray Telescope onboard Suzaku

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59s...9s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.59, No.SP1, pp.9-21

Astronomy and Astrophysics

Astronomy

203

Instruments: Detectors, Telescopes, X-Rays: General

Scientific paper

We present the design parameters, production process, and in-flight performance of the X-ray telescope (XRT) onboard Suzaku. The imaging capability is significantly improved over the ASCA XRT, which had half-power diameters of 3.'6, to 1.'8-2.'3 for all four XRT-I modules. The optical axes are found to be distributed within a radius of 1.'3, which makes the observation efficiency of all the XRTs more than 97% at the XIS-default observing position. The vignetting over the XIS field of view predicted via ray-tracing coincides with that measured for observations of the Crab Nebula to within ˜10%. Contemporaneous fits of a power law to all of the XIS spectra of the Crab Nebula taken at the two standard observing positions (XIS/HXD-default positions) gives a flux consistent with that obtained by Toor and Seward (1974, AJ, 79, 995) to within ˜2%. The pre-collimator on the top of each XRT module successfully reduces the intensity of the stray light from the 20' and 50'-off directions down to the level of pre-flight expectations.

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