  We present new 2.2 micron diffraction-limited images from the W. M. Keck 10 m
and Gemini 8 m telescopes of the cool Galactic Center sources, IRS 1W, 5, 8,
10W, and 21 along with new proper motions for IRS 1W, 10W and 21. These
observations were carried out to test the bowshock hypothesis presented by
Tanner et al. as an alternative to a very recent (10^4 yr) epoch of star
formation within the tidal stream of gas and dust known as the Northern Arm.
Resolved asymmetric structure is detected in all the sources, with bowshock
morphologies associated with IRS 1W, 5, 8 and 10W. For IRS 1W and 10W, there is
an agreement between the position angle of the asymmetry and that of the
relative velocity vector of the near-infrared source with respect to the
Northern Arm gas strengthening the bowshock hypothesis. We therefore conclude
that the observed morphology is indeed a bowshock generated by sources plowing
through the Northern Arm. Furthermore, the large extent of the resolved
structures (310-1340 AU) along with their luminosities (~10^4-5 Lsun) suggests
that their central sources are Wolf-Rayet stars, comparable to the broad He
emission-line stars, which have strong winds on the order of 1000 km/s. The
bowshock morphology, along with the proper motion measurements, provide
three-dimensional orbital solutions for this enigmatic class of objects; IRS 1W
and 10W have orbital planes that are consistent with that of the putative
clockwise plane which has been proposed as a solution for the He I
emission-line stars. While these observations eliminate the need to invoke star
formation within the Northern Arm, they increase by 14% the total known
population of massive, young stars with strong winds, whose origin remains
unexplained in the context of the nearby supermassive black hole.
