Multiple Parsec‐Scale Outflows in the NGC 2071 Cluster

Abstract

We present high-sensitivity large-scale mapping results of the NGC 2071 cluster in Orion and its surrounding environment in 12CO and 13CO J=1-->0 molecular line tracers. The data were obtained at the FCRAO 14 m telescope with an angular resolution of ~45". We show that the known outflow in NGC 2071 has a larger extent than previously reported, reaching 1.7 pc at its lowest velocities. We also report the discovery of two new outflows: the bipolar north outflow, located approximately 4' north of the main outflow, and the southeast outflow, which originates near the main outflow and has only a redshifted component. We compare our molecular-line data to the H2 data of Eislöffel and find a morphological match between the CO and H2 outflows. We also identify possible driving sources for the two new outflows from the SCUBA image of this region. We use multiple lines of evidence, including the mass-velocity relation, position-velocity maps, and the morphological relationship between the H2 and CO emission, to distinguish between entrainment models for each of these flows. Jet entrainment is the dominant entrainment mechanism in the three outflows observed in NGC 2071. The mass of the main outflow, over velocities where the outflow dominates, is 14.8 Msolar. Likewise, the mass of the southeast redshifted-only outflow is 7.6 Msolar, suggesting that it may also be driven by a luminous YSO. The mass of the north outflow is much smaller (1.4 Msolar) and is more consistent with outflows driven by low-mass stars.