Size of the Vela Pulsar's Radio Emission Region: 500 Kilometers
| Autor: | C. R. Gwinn, M. J. Ojeda, M. C. Britton, J. E. Reynolds, D. L. Jauncey, E. A. King, P. M. McCulloch, J. E. J. Lovell, C. S. Flanagan, D. P. Smits, R. A. Preston, D. L. Jones |
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| Rok vydání: | 1997 |
| Předmět: |
Physics
Scintillation Scattering Astrophysics::High Energy Astrophysical Phenomena Astrophysics::Instrumentation and Methods for Astrophysics Magnetosphere Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Vela Position angle Refraction Pulsar Space and Planetary Science Supernova remnant Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 483:L53-L56 |
| ISSN: | 0004-637X |
| DOI: | 10.1086/310734 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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