High Velocity Outflow in CO J=7-6 from the Orion Hot Core

Abstract

Using the Caltech Submillimeter Observatory 10.4-meter telescope, we performed sensitive mapping observations of 12CO J=7-6 emission at 807 GHz towards Orion IRc2. The image has an angular resolution of 10", which is the highest angular resolution data toward the Orion Hot Core published for this transition. In addition, thanks to the on-the-fly mapping technique, the fidelity of the new image is rather high, particularly in comparison to previous images. We have succeeded in mapping the northwest-southeast high-velocity molecular outflow, whose terminal velocity is shifted by ~70-85 km/s with respect to the systemic velocity of the cloud. This yields an extremely short dynamical time scale of ~900 years. The estimated outflow mass loss rate shows an extraordinarily high value, on the order of 10^{-3} Msun/yr. Assuming that the outflow is driven by Orion IRc2, our result agrees with the picture so far obtained for a 20 Msun (proto)star in the process of formation.

accepted by ApJ main journal, 13 pages 5 color figures

References in corpus (6)

• The distance to the Orion Nebula
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• Distance to Orion KL Measured with VERA
• On-The-Fly Observing System of the Nobeyama 45-m and ASTE 10-m Telescopes
• Identifying the outflow driving sources in Orion-KL
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• Explosive Outflows Powered by the Decay of Non-Hierarchical Multiple Systems of Massive Stars: Orion BN/KL
• The Orion Fingers: Near-IR Adaptive Optics Imaging of an Explosive Protostellar Outflow
• Extensive [CI] Mapping toward the Orion-A Molecular Cloud
• Catalog of dense cores in the Orion A giant molecular cloud
• New Distance and Revised Natures of High Mass Star Formation in G5.89-0.39
• Stellar Proper Motions in the Orion Nebula Cluster
• The APEX-CHAMP+ view of the Orion Molecular Cloud 1 core - Constraining the excitation with submillimeter CO multi-line observations
• The Nature and Frequency of Outflows from Stars in the Central Orion Nebula Cluster
• Mid-J CO emission from the Orion BN/KL explosive outflow
• The sub-mm J=6-5 line of 13CO in Orion