13CO and C18O J=2-1 mapping of the environment of the Class 0 protostellar core SMM 3 in Orion B9

Abstract

We attempt to achieve a better understanding of the gas distribution and velocity field around the deeply embedded Class 0 protostar SMM 3 in the Orion B9 star-forming region. Using the APEX 12-m telescope, we mapped the line emission from the J=2-1 rotational transition of two CO isotopologues, 13CO and C18O, over a 4' x 4' region around Orion B9/SMM 3. Both the 13CO and C18O lines exhibit two well separated velocity components at about 1.3 and 8.7 km/s. The emission of both CO isotopologues is more widely distributed than the submillimetre dust continuum emission as probed by LABOCA. The LABOCA 870-micron peak position of SMM 3 is devoid of strong CO isotopologue emission, which is consistent with our earlier detection of strong CO depletion in the source. No signatures of a large-scale outflow were found towards SMM 3. The 13CO and C18O emission seen at ~1.3 km/s is concentrated into a single clump-like feature at the eastern part of the map. The peak H2 column density towards a C18O maximum of the low-velocity component is estimated to be ~10^22 cm-2. A velocity gradient was found across both the 13CO and C18O maps. Interestingly, SMM 3 lies on the border of this velocity gradient. The 13CO and C18O emission at ~1.3 km/s is likely to originate from the "low-velocity part" of Orion B. Our analysis suggests that it contains high density gas, which conforms to our earlier detection of deuterated species at similarly low radial velocities. The sharp velocity gradient in the region might represent a shock front resulting from the feedback from the nearby expanding HII region NGC 2024. The formation of SMM 3, and possibly of the other members of Orion B9, might have been triggered by this feedback.

11 pages, 9 figures, and 2 tables. Accepted for publication in Astronomy and Astrophysics

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• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• HH 212: SMA Observations of a Remarkable Protostellar Jet
• A SCUBA survey of L1689 - The dog that didn't bark
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Cited by in corpus (7)

• SEDIGISM: The kinematics of ATLASGAL filaments
• The Giant Herbig-Haro Flow HH 212 and Associated Star Formation
• Gas kinematics around filamentary structures in the Orion B cloud
• APEX observations of ortho-H${}_2$D${}^{+}$ towards dense cores in the Orion B9 filament
• Dynamics, CO depletion, and deuterium fractionation of the dense condensations within the fragmented prestellar core Orion B9-SMM 6
• SABOCA 350-micron and LABOCA 870-micron dust continuum imaging of IRAS 05399-0121: mapping the dust properties of a pre- and protostellar core system
• Characterising the physical and chemical properties of a young Class 0 protostellar core embedded in the Orion B9 filament