A FOURIER-BESSEL TELESCOPE FOR HARD X-RAY ASTRONOMY

被引：0
|
作者：
CARDINI, D
POULSEN, JM
COSTA, E
DALFIUME, D
EMANUELE, A
FRONTERA, F
BASILI, A
FRANCESCHINI, T
FRUTTI, M
LANDINI, G
SILVESTRI, S
机构：
[1] CNR, IST TECNOL & STUDIO RADIAZIONI EXTRATERR, I-40126 BOLOGNA, ITALY
[2] UNIV FERRARA, DIPARTIMENTO FIS, I-44100 FERRARA, ITALY
来源：
ASTRONOMY & ASTROPHYSICS | 1992年 / 257卷 / 02期
关键词：
SPACE VEHICLES AND INSTRUMENTS; X-RAYS; GENERAL; -; IMAGING; ROTATING MODULATION COLLIMATORS;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A hard X ray (20-300 keV) Fourier-Bessel imaging telescope (FOBET) 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(4) s at a residual atmospheric depth of 3 g cm-2.
引用
收藏
页码：824 / 830
页数：7
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