tained using adaptive optics (Altair/NIRI) at
Gemini North. They find proper motions up
to 300 kilometers per second (km/s).
Survival of these knots requires that they
have densities much larger (factors of 103 or
greater) than the ambient medium through
which they propagate. Numerical simulations reproduce the overall structure and
kinematics of a moving knot. The authors
suggest that stellar merger events could
produce such outflows, while ejecting massive stars from their birthplaces
Additional images are posted at the Gemini
website. Full results appear in Astronomy and
Astrophysics, volume 579, page 130.
A New Low-luminosity
Cluster in the Outskirts of the
Milky Way
Figure 12.
Color-magnitude
diagram of all stars
withi