The Green Bank Ammonia Survey: Unveiling the Dynamics of the Barnard 59 star-forming Clump

Author(s): E. Redaelli, F. O. Alves, P. Caselli, J. E. Pineda, R. K. Friesen, A. Chacón-Tanarro, C. D. Matzner, A. Ginsburg, E. Rosolowsky, J. Keown, S. S. R. Offner, J. Di Francesco, H. Kirk, P. C. Myers, A. Hacar, A. Cimatti, H. H. Chen, M. C. Chen, K. I. Lee, Y. M. Seo
Abstract: Understanding the early stages of star formation is a research field of ongoing development, both theoretically and observationally. In this context, molecular data have been continuously providing observational constraints on the gas dynamics at different excitation conditions and depths in the sources. We have investigated the Barnard 59 core, the only active site of star formation in the Pipe Nebula, to achieve a comprehensive view of the kinematic properties of the source. This information was derived by simultaneously fitting ammonia inversion transition lines (1, 1) and (2, 2). Our analysis unveils the imprint of protostellar feedback, such as increasing line widths, temperature, and turbulent motions in our molecular data. Combined with complementary observations of dust thermal emission, we estimate that the core is gravitationally bound following a virial analysis. If the core is not contracting, another source of internal pressure, most likely the magnetic field, is supporting it against gravitational collapse and limits its star formation efficiency.
Organisation(s): Department of Astrophysics
External organisation(s): Max-Planck-Institut für extraterrestrische Physik, University of Toronto, National Radio Astronomy Observatory Socorro, University of Alberta, University of Massachusetts, Amherst, Herzberg Astronomy and Astrophysics Research Centre, Harvard-Smithsonian Center for Astrophysics, Leiden University, University of Bologna, National Aeronautics & Space Administration (NASA), University of Victoria
Journal: The Astrophysical Journal
Volume: 850
No. of pages: 14
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/aa9703
Publication date: 12-2017
Peer reviewed: Yes
Austrian Fields of Science 2012: 103004 Astrophysics
Keywords
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/64602bf0-bd59-4730-aa0c-1fc1c77338ba

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