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Southern Hemisphere VLBI Observations of the Expansion of GRO J1655–40

Published online by Cambridge University Press:  12 April 2016

E.A. King ,
D.L. Jauncey ,
J.E. Reynolds ,
A.K. Tzioumis ,
D.J. McKay ,
M.J. Kesteven ,
R. Gough ,
V. Migenes ,
M.W. Sinclair  and
S.J. Tingay
...Show all authors
E.A. King
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
D.L. Jauncey
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
J.E. Reynolds
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
A.K. Tzioumis
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
D.J. McKay
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
M.J. Kesteven
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
R. Gough
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
V. Migenes
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
M.W. Sinclair
Affiliation:
Australia Telescope National Facility, PO Box 76, Epping, 2121, Australia
S.J. Tingay
Affiliation:
Mount Stromlo and Siding Spring Observatories, Canberra, ACT, 2611, Australia
R.A. Preston
Affiliation:
Jet Propulsion Laboratory, Pasadena, California 91109, USA
D.L. Meier
Affiliation:
Jet Propulsion Laboratory, Pasadena, California 91109, USA
D.W. Murphy
Affiliation:
Jet Propulsion Laboratory, Pasadena, California 91109, USA
D.L. Jones
Affiliation:
Jet Propulsion Laboratory, Pasadena, California 91109, USA
J.E.J. Lovell
Affiliation:
Physics Department, University of Tasmania, Hobart, Tasmania, 7001, Australia
S.P. Ellingsen
Affiliation:
Physics Department, University of Tasmania, Hobart, Tasmania, 7001, Australia
P.M. McCulloch
Affiliation:
Physics Department, University of Tasmania, Hobart, Tasmania, 7001, Australia
D. Campbell-Wilson
Affiliation:
University of Sydney, NSW, 2006, Australia
R.W. Hunstead
Affiliation:
University of Sydney, NSW, 2006, Australia
J. Quick
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, Hartebeesthoek, 1740, South Africa
D. Smits
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, Hartebeesthoek, 1740, South Africa

Abstract

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We present high-resolution radio observations of the second Galactic superluminal radio source GRO1655-40, which was detected as an X-ray transient on 1994 July 27. Our radio radio images reveal two components moving away from each other at an angular speed of 65±5 mas/day, corresponding to superluminal motion (υ/c = 1.4 ± 0.4) at the estimated distance of 3–5 kpc. The 12-day delay between the X-ray and radio outbursts suggests that the ejection of material at relativistic speeds occurs during a stable phase of accretion onto a black hole, which follows an unstable phase with a high accretion rate. A complete description and discussion of these observations can be found in Tingay et al 1995 (Nature, 374, pp 141–143).

Type
Part 15. Poster Papers
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 741 - 742
Copyright
Copyright © Astronomical Society of the Pacific 1997