Computer Science
Scientific paper
Nov 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.224..567c&link_type=abstract
Nature, Volume 224, Issue 5219, pp. 567-568 (1969).
Computer Science
2
Scientific paper
LAST year1 we reported results of observations in April 1968 on the pulsar CP 1133 (ref. 1) which could have been compatible with the emission of a pulsed flux of γ-rays of ~ 2 × 10-8 photons m-2 s-1 at an energy of about 7 × 1013 eV. A similar, apparently positive effect from this source was reported by O'Mongain et al.2 at an energy 3 × 1012 eV; their observations could not distinguish between a pulsed or a continuous flux. The observations of Fazio et al.3, however, at a similar energy, gave no evidence for either a pulsed or a continuous flux. All these experiments used broadly similar night-sky Čerenkov light receivers4. Any possibility that fast light pulses might originate in the pulsar itself rather than by Čerenkov radiation in the Earth's atmosphere has been eliminated by telescope observations using coincident photo-multipliers and small angular fields5. Apparao6 has pointed out the importance that the observation of any γ-ray flux, in conjunction with the low limits for any optical emission7, has in determining the magnetic field at the source. In view of the conflicting evidence for the existence of a γ-ray flux from CP 1133 we have repeated and extended our earlier observations when this source was again favourably placed in the sky.
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