A hard X-ray telescope and its observation of the Crab pulsar

Details A hard X-ray telescope and its observation of the Crab pulsar A hard X-ray telescope and its observation of the Crab pulsar

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987acaps...7..140d&link_type=abstract

(Acta Astrophysica Sinica, vol. 7, 1987, p. 140-146) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 11, Sept. 1987, p

Astronomy and Astrophysics

Astrophysics

Crab Nebula, Pulsars, Stellar Spectrophotometry, X Ray Telescopes, Block Diagrams, Power Spectra, Systems Engineering

Scientific paper

The hard X-ray phoswich telescope, HAPI-1, is described. It was designed for making observations on high-flying balloons. The telescope comprises a 145-sq cm primary crystal of 5-cm-thick CsI (Tl), effectively shielded over the lower 2pi sr by a 5-cm-thick NaI (Tl) crystal, and has a field of view of approximately 4 deg HWHM determined by a graded shield and a collimator. The scintillation pulses originating in CsI and NaI crystals are distinguished by pulse-shape discrimination. All subsystems of the telescope are described. The Crab pulsar was observed by HAPI-1 in a balloon flight on May 23, 1984, in the energy range 20-200 keV, and the observed result is presented.

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