BALLOON-BORNE TELESCOPE SYSTEM FOR HARD X-RAY ASTRONOMY

被引:0
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作者
NARANAN, S
机构
来源
INDIAN JOURNAL OF RADIO & SPACE PHYSICS | 1991年 / 20卷 / 3-4期
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P1 [天文学];
学科分类号
0704 ;
摘要
For the study of hard X-rays (18-150 keV) from celestial X-ray sources, NaI/CsI phoswich scintillator telescopes have been flown from Hyderabad during the last decade. The 'phoswich' technique reduces the non X-ray background by a factor approximately 10 at balloon altitudes. The telescope with 1000 cm2 area [5 mm thick NaI(Tl) and 50 mm thick CsI(Na) phoswich] had a sensitivity to detect a minimum flux of 2.2 x 10(-6) photons cm-2 s-1 keV-1 in the energy range 18-150 keV for 10(4)s expolsure; this allows study of several bright active galactic nuclei (AGNs) in hard X-rays. The telescope had a microprocessor-based tracking system to automatically follow celestial sources in elevation and azimuth according to a pre-determined schedule. Several galactic X-ray sources-mostly binary pulsars-and the quasar 3C273 have been studied in the last few years. The telescope system and some of the significant results are described.
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页码:259 / 264
页数:6
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