Discovery of a Highly Collimated Flow from the High-Mass Protostar ISOSS
  J23053+5953 SMM2
  We present Very Large Array C, X, and Q-band continuum observations, as well
as 1.3 mm continuum and CO(2-1) observations with the Submillimeter Array
toward the high-mass protostellar candidate ISOSS J23053+5953 SMM2. Compact cm
continuum emission was detected near the center of the SMM2 core with a
spectral index of 0.24 between 6 and 3.6 cm, and a radio luminosity of 1.3 mJy
kpc$^2$. The 1.3 mm thermal dust emission indicates a mass of the SMM2 core of
45.8 Msun. The CO(2-1) observations reveal a large, massive molecular outflow
centered on the SMM2 core. This fast outflow ($>$ 50 km/s from the cloud
systemic velocity) is highly collimated, with a broader, lower-velocity
component. The large values for outflow mass (45.2 Msun), and momentum rate (6
x 10$^{-3}$ Msun km/s/yr) derived from the CO emission are consistent with
those of flows driven by high-mass YSOs. The dynamical timescale of the flow is
between 1.5 - 7.2 x 10$^4$ yr. We also found from the C18O to thermal dust
emission ratio that CO is depleted by a factor of about 20, possibly due to
freeze out of CO molecules on dust grains. Our data are consistent with
previous findings that ISOSS J23053+5953 SMM2 is an emerging high-mass
protostar in an early phase of evolution, with an ionized jet, and a fast,
highly collimated, and massive outflow.
