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

Lis, D. C., Wootten, H. A., Gerin, M., Pagani, L., Roueff, E., van der Tak, F. F. S., Vastel, C. & Walmsley, C. M., 20-Aug-2016, In : The Astrophysical Journal. 827, 2, 13 p., 133.

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  • STAR FORMATION AND FEEDBACK

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We present Herschel,(11) ALMA Compact Array (ACA), and Caltech Submillimeter Observatory 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 observed 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 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 similar to 1100 au, a central density of (1-2) x 10(7) cm(-3), and a mass of 0.2-0.4 M-circle dot. The dust emission peak is displaced similar to 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.

Original languageEnglish
Article number133
Number of pages13
JournalThe Astrophysical Journal
Volume827
Issue number2
Publication statusPublished - 20-Aug-2016

    Keywords

  • ISM: molecules, stars: formation, submillimeter: ISM, techniques: interferometric, techniques: spectroscopic, TRIPLY DEUTERATED AMMONIA, GOULD BELT SURVEY, PRE-STELLAR CORE, IRAS 16293-2422, DEUTERIUM FRACTIONATION, INTERSTELLAR-MEDIUM, PHYSICAL CONDITIONS, INITIAL CONDITIONS, CLOUD CORES, HERSCHEL

ID: 40802632