Does radius-to-frequency mapping persist close to the pulsar surface?

Details Does radius-to-frequency mapping persist close to the pulsar surface? Does radius-to-frequency mapping persist close to the pulsar surface?

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...324..981v&link_type=abstract

Astronomy and Astrophysics, v.324, p.981-987

Astronomy and Astrophysics

Astrophysics

36

Pulsars: General, Pulsars: Individual: Psr B0136+57, Psr B0301+19, Psr B0329+54, Psr B0355+54, Psr B0450+55, Psr B0525+21, Psr B0540+23, Psr B0740-28, Psr B0809+74, Psr B0823+26, Psr B0919+06, Psr B0950+08, Psr B1133+16, Psr B1237+25, Psr B1642-03, Psr B1822-09, Psr B1915+13, Psr B1929+10, Psr B1946+35, Psr B2016+28, Psr B2020+28, Psr B2154+40, Psr B2021+51, Psr B2045-16, Psr B2310+42, Psr B2319+60, Psr B2351+61, Polarization

Scientific paper

A major uncertainty in our understanding of pulsar emission physics is the location of the radio emission region in pulsar magnetospheres. The narrowing of the intensity profile width with increasing frequency has traditionally been taken as observational evidence supporting a radius-to-frequency mapping in pulsar magnetospheres. Here, 64 high-quality polarimetric profiles at cm-wavelengths have been analyzed to probe for the first time the emission radius at presumably deeper layers of pulsar magnetospheres. Interpreting polarization measurements in the context of the modified relativistic rotating-vector model (Blaskiewicz et al. 1991ApJ...370..643B), we derive emission altitudes and compare our results with the geometrical predictions of a rotating dipolar configuration. We conclude that for slow pulsars the emission is consistent with heights ranging between 1 and 2% of the light-cylinder radius. Only a slight radius-to-frequency mapping is evident at cm-wavelengths which saturates progressively with frequency. The consistency between the results of the two methods further supports the persistence of an undisturbed dipole field throughout the magnetospheres of slow pulsars.

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