Title : "Extremely Collimated Outflow In Taurus"
Authors :
Abstract :
We present the first case of a highly collimated, extremely high velocity
bipolar outflow in Taurus. It is powered by the low-luminosity
(0.4 $L_\odot$) source IRAS 04166+2706 and contains gas accelerated up
to 50 km s$^{-1}$ with respect to the ambient cloud
both toward the blue and the red (uncorrected for projection).
At the highest velocities, the outflow collimation
factor exceeds 20, and the gas displays a very high degree of spatial
symmetry. This very fast gas presents multiple maxima, and most likely
arises from the acceleration of ambient material by a time-variable
jet-like stellar wind. When scaled for luminosity, the
outflow parameters of IRAS 04166
are comparable to those of other extremely high
velocity outflows like L1448, indicating that even
the very quiescent star-formation mode
of Taurus can produce objects powering very
high energy flows  ($L_{mec}/L_* > 0.15$).