Star Formation and Feedback: A Molecular Outflow-Prestellar Core Interaction in L1689N

Abstract

We present Herschel, ALMA Compact Array (ACA), and Caltech Submillimeter Observatory (CSO) observations of the prestellar core in L1689N, which has been suggested to be interacting with a molecular outflow driven by the nearby solar type protostar IRAS 16293-2422. This source is characterized by some of the highest deuteration levels seen in the interstellar medium. The change in the NH2D line velocity and width across the core provides clear evidence of an interaction with the outflow, traced by the high-velocity water emission. Quiescent, cold gas, characterized by narrow line widths is seen in the NE part of the core, while broader, more disturbed line profiles are seen in the W/SW part. Strong N2D+ and ND3 emission is detected with the ACA, extending S/SW from the peak of the single-dish NH2D emission. The ACA data also reveal the presence a compact dust continuum source, with a mean size of ~1100 au, a central density of (1-2) 10^7 cm-3, and a mass of 0.2-0.4 Msun. The dust emission peak is displaced ~5" to the south with respect to the N2D+ and ND3 emission, as well as the single-dish dust continuum peak, suggesting that the northern, quiescent part of the core is characterized by spatially extended continuum emission, which is resolved out by the interferometer. We see no clear evidence of fragmentation in this quiescent part of the core, which could lead to a second generation of star formation, although a weak dust continuum source is detected in this region in the ACA data.

Accepted for publication in the Astrophysical Journal, 20 pages, 10 figures, 2 tables

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Cited by in corpus (16)

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• The central 1000 AU of a pre-stellar core revealed with ALMA. I. 1.3 mm continuum observations
• ALMA Observations of Starless Core Substructure in Ophiuchus
• NH_3(1_0-0_0) in the pre-stellar core L1544
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• A centrally concentrated sub-solar mass starless core in the Taurus L1495 filamentary complex
• The chemical structure of the Class 0 protostellar envelope NGC 1333 IRAS 4A
• The molecular environment of the solar-type protostar IRAS 16293-2422
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• Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formation
• Hunting pre-stellar cores with APEX: IRAS16293E (Oph464)
• Deuterium Fractionation across the Infrared Dark Cloud G034.77-00.55 interacting with the Supernova Remnant W44
• Nascent chemical complexity in prestellar core IRAS 16293E: complex organics and deuterated methanol
• A low cosmic-ray ionisation rate in the prestellar core Ophiuchus/H-MM1. Mapping of the molecular ions ortho-H2D+, N2H+, and DCO+
• Chemical complexity in star formation induced by stellar feedback: cores shock-formed by the supernova remnant W44
• Chemistry of Dark Molecular Clouds