Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1546..380l&link_type=abstract
In: Multilayer and grazing incidence X-ray/EUV optics; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39658 15
Astronomy and Astrophysics
Astronomy
Apertures, Astronomical Satellites, Radiation Detectors, Slits, Spaceborne Experiments, X Ray Apparatus, X Ray Astronomy, X Rays, Gamma Ray Astronomy, Signal To Noise Ratios
Scientific paper
We have investigated a slit aperture as an alternative to the square pinhole aperture for the MOXE detectors, which are to be put on the Soviet satellite Spectrum X-Gamma. A slit offers advantages for better discrimination of sources in crowded regions, eliminates the need for support structures for the aperture window, and does not compromise the signal-to-noise ratio (S/N) of a point source. We find that in a single 24 hr pointing of the satellite, MOXE can determine the position of a 10 mCrab source to better than 0.5 degrees with the slit. The structure of a titanium grate which supports the detector's beryllium window constrains the slit to be 0.5 cm x 2.56 cm, oriented at an angle of 26.6 degrees to either side of the center lines of the detector. We illustrate an arrangement of the slits on each of the six detectors which optimizes source localization for a number of pointings.
Lochner James C.
Priedhorsky William C.
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