New balloon-borne telescope system TICAL-Mark II for hard X-ray astronomy

Details New balloon-borne telescope system TICAL-Mark II for hard X-ray astronomy New balloon-borne telescope system TICAL-Mark II for hard X-ray astronomy

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14..101d&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 14, no. 2, p. (2)101-(2)107

Astronomy and Astrophysics

Astronomy

Balloon Flight, Balloon-Borne Instruments, Spaceborne Telescopes, X Ray Astronomy, X Ray Telescopes, Active Galactic Nuclei, Galactic Radiation, Scintillation Counters, X Ray Sources

Scientific paper

For the study of hard X-rays (18-150 keV) from the celestial X-ray sources, NaI/CsI phoswich scintillator telescopes have been flown from Hyderabad during the last decade. The NaI(T1)/CsI(Na) scintillator phoswich with Pulse Shape Discrimination technique reduces the non X-ray background by a factor 10 at balloon altitudes. The new telescope TICAL Mark-II with 1000sq.cm area (5 mm thick NaI(T1) and 50 mm thick CsI(Na) phoswich) had a sensitivity to detect a minimum flux of 2.2 x 10-6 photons/sq.cm sec KeV in the energy range 18-150 KeV for 104 s exposure; this allows study of several bright active galactic nuclei. The telescope had a microprocessor-based tracking system to automatically follow celestial sources in elevation and azimuth according to a predetermined schedule. Several galactic X-ray sources, mostly binary pulsars, and the quasar 3C273 have been studied. The scintillator phoswich X-ray detector, the X-ray telescope and the electronic systems of the TICAL Mark II will be described.

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