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Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst

Hannikainen, DC; Hunstead, RW; Wu, K; McIntyre, V; Lovell, JEJ; Campbell-Wilson, D; McCollough, ML; ... Tzioumis, AK; + view all (2009) Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst. Monthly Notices of the Royal Astronomical Society , 397 (1) 569 - 576. 10.1111/j.1365-2966.2009.14997.x. Green open access

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Abstract

We revisit the discovery outburst of the X-ray transient XTE J1550−564 during which relativistic jets were observed in 1998 September, and review the radio images obtained with the Australian Long Baseline Array, and light curves obtained with the Molonglo Observatory Synthesis Telescope and the Australia Telescope Compact Array. Based on Hi spectra, we constrain the source distance to between 3.3 and 4.9 kpc. The radio images, taken some 2 d apart, show the evolution of an ejection event. The apparent separation velocity of the two outermost ejecta is at least 1.3c and may be as large as 1.9c; when relativistic effects are taken into account, the inferred true velocity is ≥ 0.8c. The flux densities appear to peak simultaneously during the outburst, with a rather flat (although still optically thin) spectral index of −0.2.

Type: Article
Title: Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/j.1365-2966.2009.14997.x
Publisher version: http://dx.doi.org/10.1111/j.1365-2966.2009.14997.x
Language: English
Additional information: © 2009 RAS Definitive versions of articles pre-2013 are available at http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966, now published by http://mnras.oxfordjournals.org
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/48940
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