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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
VLBI imaging of GRO J1655-40 with the sheve array
Vistas in Astronomy, Volume 41, No. 1, Year 1997
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Description
On 27 July 1994 the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory detected an outburst of high energy X-rays from a previously unknown source in the constellation Scorpius. This source was designated GRO J1655-40. Approximately 12 days after the start of the X-ray outburst, a strong outburst of radio emission occurred. Here we present very long baseline interferometry (VLBI) observations of GRO J1655-40 made with an array of telescopes in Australia, South Africa, and the western United States. These observations show that the radio source which appeared two weeks after the initial X-ray outburst consisted of two prominent components which separated with an apparent speed of 1.5 ± 0.4c. When the various possibilities for the geometry of the radio source are taken into account the apparent speed implies an intrinsic speed between 0.5c and 0.9c. Our results and those of other investigators imply a strong link between the accretion of material onto a highly compact object and the ejection of relativistic components of radio emission. © 1997 Elsevier Science Ltd. All rights reserved.
Authors & Co-Authors
Jones, Dayton L.
United States, Pasadena
Jet Propulsion Laboratory
Tingay, Steven John
United States, Pasadena
Jet Propulsion Laboratory
Jauncey, David L.
Australia, Sydney
Australia Telescope National Facility
Preston, Robert A.
United States, Pasadena
Jet Propulsion Laboratory
Reynolds, John E.
Australia, Sydney
Australia Telescope National Facility
Meier, David L.
United States, Pasadena
Jet Propulsion Laboratory
Murphyl, D. W.
United States, Pasadena
Jet Propulsion Laboratory
Tzioumis, Anastasios K.
Australia, Sydney
Australia Telescope National Facility
McKay, D. J.
Australia, Sydney
Australia Telescope National Facility
Kesteven, Michael J.L.
Australia, Sydney
Australia Telescope National Facility
Lovell, James E.J.
Australia, Hobart
University of Tasmania
Campbell-Wilson, Duncan
Australia, Sydney
The University of Sydney
Ellingsen, S. P.
Australia, Hobart
University of Tasmania
Gough, Russell G.
Australia, Sydney
Australia Telescope National Facility
Hunstead, Richard W.
Australia, Sydney
The University of Sydney
McCulloch, Peter M.
Australia, Hobart
University of Tasmania
Migénes, Victor
Australia, Sydney
Australia Telescope National Facility
Quick, Jonathan F.H.
South Africa, Krugersdorp
Hartebeesthoek Radio Astron. O.
Sinclair, Malcolm W.
Australia, Sydney
Australia Telescope National Facility
Smits, Derck P.
South Africa, Krugersdorp
Hartebeesthoek Radio Astron. O.
Statistics
Citations: 20
Authors: 20
Affiliations: 5
Identifiers
Doi:
10.1016/S0083-6656(96)00058-X
ISSN:
00836656
Research Areas
Environmental
Study Approach
Quantitative
Study Locations
South Africa