Are the γ-ray from the Vela pulsar polarized?

Details Are the γ-ray from the Vela pulsar polarized? Are the γ-ray from the Vela pulsar polarized?

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aipc..170..362c&link_type=abstract

AIP Conference Proceedings, Volume 170, pp. 362-367 (1988).

Mathematics

Probability

Pulsars

Scientific paper

The azimuthal distribution of planes containing e+/e- pairs from high-energy photon materialization is reminiscent, through a quadrupole anisotropy, of the degree and position angle of linear polarization of the incident photons. Data from the COS-B spark chamber are used in a search for such an effect in >~50 MeV photons from bright sources, such as Vela, Crab, Geminga and a reference galactic plane region in Cygnus. Only for the Vela pulsar a low-chance-probability effect is found apparently implying a high (~100%) degree of linear polarization for the Vela photons. This has important implications on the physics of the production mechanisms as well as of their geometry.

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