Bipolar Molecular Outflows in L1551 IRS5 and L1551 NE Protostellar Systems
Date Issued
2009
Date
2009
Author(s)
Wu, Po-Feng
Abstract
L1551 molecular cloud is located at a distance of ∼ 140 pc, in the constellation of Taurus, and is one of the nearest active low-mass star formation region. We used the Submillimeter Array (SMA) to image the CO molecular outflows from two multiple protostellar systems in L1551 region, L1551 IRS5 and L1551 NE, at an arcsecond angular resolution. We observed the CO(2–1)ine emission in L1551 IRS5 system. First, we imaged the base of the outflowavity and found signatures for multiple outflow events. We also foundewly entrained gas in the cavity, indicating that the ambient gas is stillalling into the cavity. Second, we discovered a precessing outflow, whichas an opposite inclination to it of L1551 IRS5 large-scale outflow. Thisewly-found component is likely driven by the recently proposed candidatehird protostar in L1551 IRS5 system. For the L1551 NE binary system, wehows a clear bipolar structure of its molecular outflow at the first time. Weaw a cavity-like structure corresponding to the reflection nebula at infreredavelength, but no jet-like structure, which is also seen at infrared. It isikely that, one of the binary launched the outflow first and cleaned ambientas away, thus the outflow from another protostar entrained less gas and isnable to be detected. The mass of L1551 NE outflow and the dusty envelopere both by orders of magnitude smaller than those of other Class 0 protostars,uggesting the ambient gas has been swept up by the strong outflowrom L1551 IRS5.
Subjects
star-formation
low-mass
outflow
protostar
binary
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