Large-area phoswich balloon experiment for hard-X-ray astronomy |
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Authors: | F Frontera D Dal Fiume T Franceschini G Landini E Morelli M Pamini A Rubini S Silvestri G Spada E Costa D Cardini and A Emanuele |
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Institution: | (1) Istituto T.E.S.R.E. del C.N.R., Bologna, Italia;(2) Istituto di Astrofisica Spaziale, Frascati, Italia |
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Abstract: | Summary We describe a balloon experiment, currently in the marking, devoted to the observation of celestial X-ray sources. The main
features of the X-ray telescope are summarized as follows. It operates in the energy band from 20 to 300 keV. Its energy resolution
is about 17% at 60 keV. Under the hypothesis of 104 s of observing time, 3 mbar of residual atmospheric pressure and 3σ of statistical significance, the expected sensitivity
of the instrument is 2·10−6 photons/cm2 s keV in the (20÷200) keV energy band, corresponding to about 1 milliCrab. Its high sensitivity allows us to detect both
time variability in the flux and cyclotron lines in the spectra of X-ray sources. It has a field of view of 3° FWHM and has
the possibility of resolving complex fields by using multipitch modulation collimators. With such a configuration its angular
resolution is about 10′.
Paper presented at the 2° Convegno Nazionale di Fisica Cosmica, held at L'Aquila, 29 May–2 June 1984. |
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Keywords: | Astronomical instruments |
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