出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：There is currently a discrepancy in the proper motions measured on different angular scales in
the approaching radio jets of the black hole X-ray binary GRS 1915+105. Lower velocities were
measured with the VLA prior to 1996 than were subsequently found from higher-resolution observations
made with the VLBA and MERLIN arrays. We initiated an observing campaign to use
all three arrays to track the motion of the jet knots from the February 2006 outburst of the source,
giving us unprecedented simultaneous coverage of all angular scales, unbroken from scales of
0.8milliarcseconds out to 20 arcseconds. We measured a proper motion of 16.6mas d−1, demonstrating
that there has been no significant permanent change in the properties of the jet since 1994.
We found no conclusive evidence for deceleration of the jet knot, unless this occurs within 75mas
of the core.
