Size of the Vela Pulsar's Radio Emission Region: 500 km

Details Size of the Vela Pulsar's Radio Emission Region: 500 km Size of the Vela Pulsar's Radio Emission Region: 500 km

1996-08-14

arxiv.org/abs/astro-ph/9608088v1

Astronomy and Astrophysics

Astrophysics

14 pages, includes 2 figures. Also available at: http://charm.physics.ucsb.edu:80/people/cgwinn/cgwinn_group/cgwinn_group.html

Scientific paper

10.1086/310734

We use interstellar scattering of the Vela pulsar to determine the size of its emission region. From interferometric phase variations on short baselines, we find that radio-wave scattering broadens the source by 3.4+/-0.3 milliarcseconds along the major axis at position angle 81+/-3 degrees. The ratio of minor axis to major axis is 0.51+/-0.03. Comparison of angular and temporal broadening indicates that the scattering material lies in the Vela-X supernova remnant surrounding the pulsar. From the modulation of the pulsar's scintillation on very short baselines, we infer a size of 500 km for the pulsar's emission region. We suggest that radio-wave refraction within the pulsar's magnetosphere may plausibly explain this size.

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