The Crab pulsar light curve in the soft gamma ray range: FIGARO II results

Details The Crab pulsar light curve in the soft gamma ray range: FIGARO II results The Crab pulsar light curve in the soft gamma ray range: FIGARO II results

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..222m&link_type=abstract

In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 222-228 (SEE N92-21874 12-90)

Astronomy and Astrophysics

Astronomy

2

Emission Spectra, Energy Spectra, Gamma Rays, Light Curve, Positron Annihilation, Pulsars, Red Shift, Balloon Flight, Gamma Ray Astronomy, Gamma Ray Observatory, Line Spectra, Radiation Sources, Scintillation Counters, Stellar Spectra

Scientific paper

The FIGARO II experiment (a large area, balloon borne, crystal scintillator detector working from 0.15 to 4.3 MeV) observed the Crab pulsar on 1990 Jul. 9 for about seven hours. The study of the pulse profile confirms some structures detected with a low significance during the shorter observation of 1986, and adds new important elements to the picture. In particular, between the two main peaks, two secondary peaks appear centered at phase values 0.1 and 0.3, in the energy range 0.38 to 0.49 MeV; in the same energy range, a spectral feature at 0.44 MeV, interpreted as a redshifted positron annihilation line, was observed during the same balloon flight in the phase interval including the second main peak and the neighboring secondary peak. If the phase interval considered is extended to include also the other secondary peak, the significance of the spectral line appears to increase.

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