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Session 20 - Molecular Clouds, Dense Cores, and Protostars.
Display session, Monday, January 15
North Banquet Hall, Convention Center

[20.20] 1-5 \mum Imaging of IRAS 20050+2720: A Young Cluster Associated with a Multipolar Outflow

H. Chen, M. Tafalla, T. P. Greene, P. C. Myers (CfA)

We report on the detection of an embedded young cluster of \sim 200 sources at 1-5 \mum using KPNO 2.1 m telescope and NASA IRTF. This cluster is associated with IRAS 20050+2720, the source of a recently discovered multipolar outflow. More than half of the sources in the cluster show infrared excess, and are therefore pre-main sequence in nature. The cluster luminosity function resembles that predicated by the models for coeval clusters of \sim1 Myr, although there is evidence in our images that star formation has spread over time. In fact, this cluster contains three subclusters at different evolutionary states. The youngest one seems associated with the origin of the multipolar outflow, and contains several extremely red sources. Two of these red sources are only detectable at \lambda > 3 \mum, corresponding to deeply embedded class I objects. Our observations, therefore, support the suggestion that the multiple lobes of the CO outflow arise from independent outflows powered by different extremely young stars in this cluster.

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