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Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst
journal contribution
posted on 2023-05-16, 23:53 authored by Hannikainen, DC, Hunstead, RW, Wu, K, McIntyre, V, James LovellJames Lovell, Campbell-Wilson, D, McCollough, ML, Reynolds, J, Tzioumis, AKWe 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 ¡Ý 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.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
397Pagination
569-576ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Wiley-Blackwell Publishing IncPlace of publication
Malden, USARights statement
The definitive published version is available online at: http://interscience.wiley.comRepository Status
- Restricted