A Fourier-Bessel telescope for hard X-ray astronomy

Details A Fourier-Bessel telescope for hard X-ray astronomy A Fourier-Bessel telescope for hard X-ray astronomy

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..824c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 824-830.

Astronomy and Astrophysics

Astronomy

2

Balloon-Borne Instruments, X Ray Astronomy, X Ray Telescopes, Collimators, Fourier Transformation, Monte Carlo Method, X Ray Imagery

Scientific paper

A hard X-ray (20-300 keV) Fourier-Bessel imaging telescope devoted to observations of celestial X-ray sources from stratospheric balloons is described. The imaging capabilities are obtained by the use of 16 rotating modulation collimators, each with different pitch angle, mounted above the field collimators of the large area hard X-ray experiment LAPEX. The detection plane of this experiment is made of 16 NaI(Tl)/CsI(Na) phoswich detectors. The theory of the Fourier-Bessel transform image is reviewed and the optical properties of our imaging device are determined. Also, the effects of the gondola azimuth instability are studied. The expected angular resolution of the telescope is 22 arcmin. Its expected 3 sigma sensitivity in the 20-200 keV energy band corresponds to 10 mCrab for an on-axis source observed for 10,000 s at a residual atmospheric depth of 3 g/sq cm.

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