AbstractFor 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(Tl)/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(Tl) and 50 mm thick CsI(Na) phoswich] had a sensitivity to detect a minimum flux of 2.2 × 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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    Titel :

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


    Beteiligte:
    Damle, S.V. (Autor:in) / Janawalekar, S.B. (Autor:in) / Kothare, A.T. (Autor:in) / Kunte, P.K. (Autor:in) / Malkar, J.P. (Autor:in) / Naranan, S. (Autor:in) / Sreekantan, B.V. (Autor:in) / Adarkar, H.R. (Autor:in) / Leahy, D.A. (Autor:in) / Venkatesan, D. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 14 , 2 ; 101-107


    Erscheinungsdatum :

    1993-01-01


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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