Astrophys. J., 831, 36-36 (2016/November-1)
Characterizing the youngest Herschel-detected protostars. II. Molecular outflows from the millimeter and the far-infrared.
TOBIN J.J., STUTZ A.M., MANOJ P., MEGEATH S.T., KARSKA A., NAGY Z., WYROWSKI F., FISCHER W.J., WATSON D.M. and STANKE T.
Abstract (from CDS):
We present Combined Array for Research in Millimeter-wave Astronomy (CARMA) CO (J=1→0) observations and Herschel PACS spectroscopy, characterizing the outflow properties toward extremely young and deeply embedded protostars in the Orion molecular clouds. The sample comprises a subset of the Orion protostars known as the PACS Bright Red Sources (PBRS; Stutz et al.). We observed 14 PBRS with CARMA and 8 of these 14 with Herschel, acquiring full spectral scans from 55 to 200 µm. Outflows are detected in CO (J=1→0) from 8 of 14 PBRS, with two additional tentative detections; outflows are also detected from the outbursting protostar HOPS 223 (V2775 Ori) and the Class I protostar HOPS 68. The outflows have a range of morphologies; some are spatially compact, <10,000 au in extent, while others extend beyond the primary beam. The outflow velocities and morphologies are consistent with being dominated by intermediate inclination angles (80deg >= i >= 20deg). This confirms the interpretation of the very red 24-70 µm colors of the PBRS as a signpost of high envelope densities, with only one (possibly two) cases of the red colors resulting from edge-on inclinations. We detect high-J (Jup > 13) CO lines and/or H2O lines from 5 of 8 PBRS and only for those with detected CO outflows. The far-infrared CO rotation temperatures of the detected PBRS are marginally colder (∼230 K) than those observed for most protostars (∼300 K), and only one of these five PBRS has detected [O i] 63 µm emission. The high envelope densities could be obscuring some [O i] emission and cause a ∼20 K reduction to the CO rotation temperatures.
© 2016. The American Astronomical Society. All rights reserved.
ISM: jets and outflows - ISM: molecules - methods: observational - stars: formation - stars: protostars - techniques: interferometric - techniques: interferometric
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