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Do we see deceleration in GRS 1915+105?

How relativistic are XRB jets?

Relativistic outbursts in GRS 1915+105

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

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My research

X-ray binary jets

Relativistic jets are well-known in extragalactic radio astronomy. It is believed that such phenomena are powered supermassive black holes in the centres of the host galaxies. Accretion onto the compact object results in the formation of an accretion disk and the ejection of relativistic plasma in a collimated outflow. Analogues of such systems have been found in our own galaxy, except that instead of the central source being a 107Mo black hole, it may be a stellar-mass black hole, or even a neutron star. Such systems have been nicknamed "Microquasars", indicating not only similar morphology to their massive namesakes, but also, it is believed, similar physics.

Doctoral research

My thesis was a case study at radio wavelengths of the Galactic X-ray binary system, Cygnus X-3. This system is located in the galactic plane in or behind one of the spiral arms at a distance of approximately 10kpc. The nature of the compact object it harbours is still uncertain, although the infrared spectrum of the source indicates that its companion is a Wolf-Rayet star of the WN7 subclass. It has an orbital period of 4.8 hours, and periodically undergoes huge radio outbursts, reaching fluxes of up to 20Jy.

Recent research

I have recently studied MERLIN observations of the 2001 March and July jet ejection events of 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.

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