The Rotating Outflow, Envelope and Disk in Class-0/I protostar [BHB2007]
  11 in the Pipe Nebula
  We present the results of observations toward a low-mass Class-0/I protostar,
[BHB2007]#11 (afterwards B59#11) at the nearby (d=130 pc) star forming region,
Barnard 59 (B59) in the Pipe Nebula with the Atacama Submillimeter Telescope
Experiment (ASTE) 10 m telescope (~22" resolution) in CO(3--2), HCO+,
H13CO+(4--3), and 1.1 mm dust-continuum emissions. We also show Submillimeter
Array (SMA) data in 12CO, 13CO, C18O(2--1), and 1.3 mm dust-continuum emissions
with ~5" resolution. From ASTE CO(3--2) observations, we found that B59#11 is
blowing a collimated outflow whose axis lies almost on the plane of the sky.
The outflow traces well a cavity-like structure seen in the 1.1 mm
dust-continuum emission. The results of SMA 13CO and C18O(2--1) observations
have revealed that a compact and elongated structure of dense gas is associated
with B59#11, which is oriented perpendicular to the outflow axis. There is a
compact dust condensation with a size of 350x180 AU seen in the SMA 1.3 mm
continuum map, and the direction of its major axis is almost the same as that
of the dense gas elongation. The distributions of 13CO and C18O emission also
show the velocity gradients along their major axes, which are considered to
arise from the envelope/disk rotation. From the detailed analysis of the SMA
data, we infer that B59#11 is surrounded by a Keplerian disk with a size of
less than 350 AU. In addition, the SMA CO(2--1) image shows a velocity gradient
in the outflow along the same direction as that of the dense gas rotation. We
suggest that this velocity gradient shows a rotation of the outflow.
