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

  • E.A. King (a1), D.L. Jauncey (a1), J.E. Reynolds (a1), A.K. Tzioumis (a1), D.J. McKay (a1), M.J. Kesteven (a1), R. Gough (a1), V. Migenes (a1), M.W. Sinclair (a1), S.J. Tingay (a2), R.A. Preston (a3), D.L. Meier (a3), D.W. Murphy (a3), D.L. Jones (a3), J.E.J. Lovell (a4), S.P. Ellingsen (a4), P.M. McCulloch (a4), D. Campbell-Wilson (a5), R.W. Hunstead (a5), J. Quick (a6) and D. Smits (a6)...

Abstract

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).

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