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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Size of the vela pulsar's emission region at 18 cm wavelength
Astrophysical Journal, Volume 758, No. 1, Article 7, Year 2012
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Description
We present measurements of the linear diameter of the emission region of the Vela pulsar at observing wavelength λ = 18 cm. We infer the diameter as a function of pulse phase from the distribution of visibility on the Mopra-Tidbinbilla baseline. As we demonstrate, in the presence of strong scintillation, finite size of the emission region produces a characteristic W-shaped signature in the projection of the visibility distribution onto the real axis. This modification involves heightened probability density near the mean amplitude, decreased probability to either side, and a return to the zero-size distribution beyond. We observe this signature with high statistical significance, as compared with the best-fitting zero-size model, in many regions of pulse phase. We find that the equivalent FWHM of the pulsar's emission region decreases from more than 400 km early in the pulse to near zero at the peak of the pulse and then increases again to approximately 800 km near the trailing edge. We discuss possible systematic effects and compare our work with previous results. © © 2012. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Gwinn, Carl R.
United States, Santa Barbara
University of California, Santa Barbara
Johnson, Michael D.
United States, Santa Barbara
University of California, Santa Barbara
Reynolds, John E.
Australia, Sydney
Australia Telescope National Facility
Jauncey, David L.
Australia, Sydney
Australia Telescope National Facility
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Tzioumis, Anastasios K.
Australia, Sydney
Australia Telescope National Facility
Hirabayashi, Hisashi
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
Kobayashi, Hideyuki
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
Japan, Mitaka
National Institutes of Natural Sciences - National Astronomical Observatory of Japan
Murata, Yasuhiro J.
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
Edwards, Philip G.
Australia, Sydney
Australia Telescope National Facility
Japan, Sagamihara
Jaxa Institute of Space and Astronautical Science
Dougherty, Sean M.
Canada, Ottawa
National Research Council Canada
Carlson, Brent R.
Canada, Ottawa
National Research Council Canada
del Rizzo, David A.
Canada, Ottawa
National Research Council Canada
Quick, Jonathan F.H.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Flanagan, Claire S.
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
McCulloch, Peter M.
Australia, Hobart
University of Tasmania
Statistics
Citations: 15
Authors: 15
Affiliations: 8
Identifiers
Doi:
10.1088/0004-637X/758/1/7
ISSN:
0004637X
e-ISSN:
15384357
Research Areas
Environmental