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Astron. Astrophys. 329, 504-510 (1998)


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VLBI monitoring of the complex jet of Cygnus X-3
during the January 1991 outburst

C.J. Schalinski 1, 2, K.J. Johnston 3, A. Witzel 2, E.B. Waltman 4, G. Umana 5, P.E. Pavelin 6, F.D. Ghigo 7, T. Venturi 8, F. Mantovani 8, A.R. Foley 9, R.E. Spencer 10 and R.J. Davis 10

1 Institute of Space Sensor Technology, German Aerospace Research Establishment (DLR) Adlershof, Rudower Chaussee 5,
D-12489 Berlin, Germany
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
3 U.S. Naval Observatory, 3450 Massachusetts Ave., NW, Washington, D.C. 20392-5420, USA
4 Remote Sensing Division, Code 7210, Naval Research Laboratory, Washington, D.C. 20375-5351, USA
5 Istituto di Radioastronomia del C.N.R. Bologna, VLBI Station, P.O. Box 169, Noto, Italy
6 University of Birmingham, School of Physics and Space Research, P.O. Box 363, Edgbaston Park Road, Birmingham B15 2TT, UK
7 National Radio Astronomy Observatory, P.O. Box 2, Green Bank, W.V. 24944, USA
8 Istituto di Radioastronomia del C.N.R., Via Gobetti 101, I-40129 Bologna, Italy
9 Radiosterrenwacht, Postbus 2, 7990 AA Dwingeloo, The Netherlands
10 Nuffield Radio Laboratories, Jodrell Bank, Macclesfield, Cheshire SK11 9DL, UK

Received 24 January 1995 / Accepted 24 April 1995

Abstract

We report on high sensitivity VLBI observations of Cygnus X-3 at 6 cm wavelength on four consecutive days during the large radio flaring event in January, 1991. Both total flux density evolution and visibility amplitudes indicate the presence of a complex jet. The superposition of flares however excludes unique modelling of the source structure and evolution. The minimum consistent interpretation requires at least five components of scattering size 16 milliarc-seconds (mas), resulting in a linear structure with a position angle of [FORMULA] with an uncertainty estimate of [FORMULA].

Key words: stars, individual: Cygnus X-3 – X-ray binaries – interferometry: VLBI – quasars – galaxies: jets – interstellar matter

Send offprint requests to: C.J. Schalinski, Institut für Weltraumsensorik, Deutsches Forschungszentrum für Luft- und Raumfahrt e.V. (DLR) Adlershof, Rudower Chaussee 5, D-12489 Berlin, Germany (e-mail: schalinski@dlr.de)

© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997
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