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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Interstellar scintillation of the double pulsar j0737-3039
Astrophysical Journal, Volume 787, No. 2, Article 161, Year 2014
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Description
We report a series of observations of the interstellar scintillation (ISS) of the double pulsar J0737-3039 over the course of 18 months. As in earlier work, the basic phenomenon is the variation in the ISS caused by the changing transverse velocities of each pulsar, the ionized interstellar medium (IISM), and the Earth. The transverse velocity of the binary system can be determined both by very long baseline interferometry and timing observations. The orbital velocity and inclination is almost completely determined from timing observations, but the direction of the orbital angular momentum is not known. Since the Earth's velocity is known, and can be compared with the orbital velocity by its effect on the timescale of the ISS, we can determine the orientation Ω of the pulsar orbit with respect to equatorial coordinates (Ω = 65 ± 2°). We also resolve the ambiguity (i = 88.°7 or 91.°3) in the inclination of the orbit deduced from the measured Shapiro delay by our estimate i = 88.°1 ± 0.°5. This relies on the analysis of the ISS over both frequency and time, and provides a model for the location, anisotropy, turbulence level, and transverse phase gradient of the IISM. We find that the IISM can be well-modeled during each observation, typically of a few orbital periods, but its turbulence level and mean velocity vary significantly over the 18 months. © 2014. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Coles, William A.
United States, La Jolla
University of California, San Diego
McLaughlin, Maura Ann
United States, Morgantown
West Virginia University
United Kingdom, Manchester
The University of Manchester
Ransom, Scott M.
United States, Charlottesville
National Radio Astronomy Observatory
Camilo, Fernando
Puerto Rico, Arecibo
National Astronomy and Ionosphere Center Arecibo Observatory
United States, New York
Columbia University
Ferdman, Robert D.
United Kingdom, Manchester
The University of Manchester
Canada, Montreal
Université Mcgill
Freire, Paulo C.C.
Canada, Montreal
Université Mcgill
Germany, Bonn
Max Planck Institute for Radio Astronomy
Kramer, Michael
United Kingdom, Manchester
The University of Manchester
Germany, Bonn
Max Planck Institute for Radio Astronomy
Lyne, Andrew G.
United Kingdom, Manchester
The University of Manchester
Stairs, Ingrid H.
Canada, Vancouver
The University of British Columbia
Statistics
Citations: 32
Authors: 9
Affiliations: 9
Identifiers
Doi:
10.1088/0004-637X/787/2/161
ISSN:
0004637X