Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.9905c&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #99.05; Bulletin of the American Astronomical Society, Vol. 24, p.1276
Astronomy and Astrophysics
Astronomy
Scientific paper
Polarimetric studies of pulsar emission have shown that there are two different types of emission present in integrated pulse profiles. Core emission is characterized by antisymmetric circular polarization, which can be as high as 50 percent of the total intensity, and conal emission, of which there may be as many as two cones, either surrounding a core component, or solely present. The latter is frequently characterized by high linear polarization and a polarization angle traverse of 180 degrees, indicative of emission by curvature radiation. Whether or not any pulsar emits only the conal type emission is a question which needs further study. While there exists several examples of pulsars with integrated profiles which do not show signs of a core component in total intensity, careful polarization measure- ments of this type of pulsar would indicate the presence or absence of circular polarization in the center of the emission region. Observations at 430 MHz of several conal double pulsars were taken with the Arecibo 305-m radio telescope in February and October of 1992. The difference in gain and ellipticity of the left- and right-hand circular antennas was carefully measured for each observing session and used to correct the data to obtain accurate polarimetric information from the pulsars. This information, as well as linear power and total intensity, will be presented graphically for each of the observed pulsars.
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