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How relativistic are XRB jets?

Relativistic outbursts in GRS 1915+105

Contact:

Astronomical Instituut 'Anton Pannekoek',
Universiteit van Amsterdam,
Kruislaan 403,
1098 SJ,
Amsterdam,
The Netherlands

GRS1915+105

Perhaps the most famous of the microquasars, this was the first Galactic system in which superluminal motion was discovered (Mirabel & Rodriguez 1994). It is thought to contain a 14-solar mass black hole and a K-M III giant donor star.

2006 monitoring

Following the detection of an X-ray flare beginning on 2006 February 20 with the RXTE ASM and an associated radio flare to >300mJy at 2 GHz on February 23, we triggered a weekly monitoring programme with the A-configuration VLA. The latest results will be updated as new observations are made. The programme is due to last until the end of A-configuration in mid-May.

2001 outbursts

I studied MERLIN observations of the 2001 March and July jet ejection events of GRS1915+105. Animated GIFs of the ejecta moving outwards may be seen at:

These data have now been published (Miller-Jones et al., 2005, MNRAS, 363, 867). Higher-resolution postscript figures of the outbursts can be downloaded from this link.