Search for linear polarization in Gamma-ray sources: possible evidence for the Vela pulsar

Title:

Search for linear polarization in Gamma-ray sources: possible evidence for the Vela pulsar

Creator:

Caraveo, P. A., G. F., Mitrofanov, I., and Vacanti, G.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:3f2c19f9-5c76-435d-8ab8-37cb699d1675
uuid:3f2c19f9-5c76-435d-8ab8-37cb699d1675

Subject:

astrophysics, Gamma-ray sources, and linear polarization

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

The azirnuthal distribution of planes containing e^i/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 on open pairs in 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. After a description of the method and the related simulations and tests, the analysis of the available data shows no anisotropy for the other sources, but 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 is discussed in light of the physics of the production mechanisms as well as of their geometry.

Language:

Czech

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Coverage:

227-237

Source:

Publications of the Astronomical Institute of the Academy of Sciences of the Czech Republic | 1987 Volume:63-70 | Number:70

Harvested from:

CDK

Metadata only:

false