Kinematics of the L1551 Jet
The velocity structure of the L 1551 jet in
[S II] 6731. North is to the right and east is up.
The jet moves to the WSW away from the IRS 5, which is located
off the field of view to the upper right in each frame.
Labels on the individual knots follow the nomenclature of
Stocke etal (1988). The color composites were made by loading
images of a specified range of radial velocities (labeled
by R, G, and B in km/s with respect to L 1551 in the figure)
into the red, green, and blue channels, respectively.
Equal intensities of red and green produce yellow, while
equal amounts of red, green and blue give white.
Left: Two overviews of the region with differing color representations
of the velocity fields. The data show that the two jets
imaged by FL98 have markedly dissimilar radial velocities. Right: Two composites of the
bright jet that show a sharp deceleration of jet material
as it enters knot #3. The white area in the top right frame
marks the region with the largest emission line width. An area of
slower blueshifted material that precedes the bow shock
appears as a reddish halo surrounding the brightest
emission in these composites.