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标题：The proper motion and changing jet morphology of Cygnus X-3
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作者：J.C.A. Miller-Jones ; C.M. Sakari ; V. Dhawan 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2009
卷号：2009
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present analysis of 25 years’ worth of archival VLA, VLBA and EVN observations of the Xray binary Cygnus X-3. From this, we deduce the source proper motion, allowing us to predict the location of the central binary system at any given time. However, the line of sight is too scatterbroadened for us to measure a parallactic distance to the source. The measured proper motion allows us to constrain the three-dimensional space velocity of the system, implying a minimum peculiar velocity of 9 kms−1. Reinterpreting VLBI images from the literature using accurate core positions shows the jet orientation to vary with time, implying that the jets are oriented close to the line of sight and are likely to be precessing.