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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 TelescopeExperiment (ASTE) 10 m telescope (~22" resolution) in CO(3--2), HCO+,H13CO+(4--3), and 1.1 mm dust-continuum emissions. We also show SubmillimeterArray (SMA) data in 12CO, 13CO, C18O(2--1), and 1.3 mm dust-continuum emissionswith ~5" resolution. From ASTE CO(3--2) observations, we found that B59#11 isblowing 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 mmdust-continuum emission. The results of SMA 13CO and C18O(2--1) observationshave revealed that a compact and elongated structure of dense gas is associatedwith B59#11, which is oriented perpendicular to the outflow axis. There is acompact dust condensation with a size of 350x180 AU seen in the SMA 1.3 mmcontinuum map, and the direction of its major axis is almost the same as thatof the dense gas elongation. The distributions of 13CO and C18O emission alsoshow the velocity gradients along their major axes, which are considered toarise from the envelope/disk rotation. From the detailed analysis of the SMAdata, we infer that B59#11 is surrounded by a Keplerian disk with a size ofless than 350 AU. In addition, the SMA CO(2--1) image shows a velocity gradientin the outflow along the same direction as that of the dense gas rotation. Wesuggest that this velocity gradient shows a rotation of the outflow.

The Rotating Outflow, Envelope and Disk in Class-0/I protostar [BHB2007] 11 in the Pipe Nebula