Gamma rays of 0.3 to 30 MeV from PSR 0531+21

Details Gamma rays of 0.3 to 30 MeV from PSR 0531+21 Gamma rays of 0.3 to 30 MeV from PSR 0531+21

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..151w&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 151-154 (SEE N85-33902 22-93)

Astronomy and Astrophysics

Astronomy

Crab Nebula, Energy Spectra, Gamma Rays, High Energy Interactions, Pulsars, Pulsed Radiation, X Ray Scattering, Celestial Bodies, Cosmic Rays, Radiation Sources, Radio Sources (Astronomy), Scatterometers, Telescopes

Scientific paper

Pulsed gamma rays from the Crab Pulsar PSR 0531+21 are reported for energies of 0.3 to 30 MeV. The observations were carried out with the UCR gamma ray double Compton scatter telescope launched on a balloon from Palestine, Texas at 4.5 GV, at 2200 LT, September 29, 1978. Two 8 hr observations of the pulsar were made, the first starting at 0700 UT (0200 LT) September 30 just after reaching float altitude of 4.5 g/sq cm. Analysis of the total gamma ray flux from the Crab Nebula plus pulsar using telescope vertical cell pairs was published previously. The results presented supersede the preliminary ones. The double scatter mode of the UCR telescope measures the energy of each incident gamma ray from 1 to 30 MeV and its incident angle to a ring on the sky. The time of arrival is measured to 0.05 ms. The direction of the source is obtained from overlapping rings on the sky. The count rate of the first scatter above a threshold of 0.3 MeV is recorded every 5.12 ms. The Crab Pulsar parameters were determined from six topocentric arrival times of optical pulses.

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