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


Hannikainen, DC and Hunstead, RW and Wu, K and McIntyre, V and Lovell, JEJ and Campbell-Wilson, D and McCollough, ML and Reynolds, J and Tzioumis, AK, Revisiting the relativistic ejection event in XTE J1550-564 during the 1998 outburst, Monthly Notices of the Royal Astronomical Society, 397, (1) pp. 569-576. ISSN 0035-8711 (2009) [Refereed Article]

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DOI: doi:10.1111/j.1365-2966.2009.14997.x


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.

Item Details

Item Type:Refereed Article
Keywords:stars:individual:XTE J1550-564-radio continuum:stars-radio lines:stars-X-rays:binaries
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:57506
Year Published:2009
Web of Science® Times Cited:23
Deposited By:Physics
Deposited On:2009-07-22
Last Modified:2010-03-25

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