Journal Article

ALMA and VLA observations of the outflows in IRAS 16293−2422

Laurent Loinard, Luis A. Zapata, Luis F. Rodríguez, Gerardo Pech, Claire J. Chandler, Crystal L. Brogan, David J. Wilner, Paul T. P. Ho, Bérengère Parise, Lee W. Hartmann, Zhaohuan Zhu, Satoko Takahashi and Alfonso Trejo

in Monthly Notices of the Royal Astronomical Society: Letters

Published on behalf of The Royal Astronomical Society

Volume 430, issue 1, pages L10-L14
Published in print March 2013 |
Published online December 2012 | e-ISSN: 1745-3933 | DOI: http://dx.doi.org/10.1093/mnrasl/sls038

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We present Atacama Large Millimeter/submillimeter Array (ALMA) and Very Large Array (VLA) observations of the molecular and ionized gas at 0.1–0.3 arcsec resolution in the Class 0 protostellar system IRAS 16293−2422. These data clarify the origins of the protostellar outflows from the deeply embedded sources in this complex region. Source A2 is confirmed to be at the origin of the well-known large-scale north-east–south-west flow. The most recent VLA observations reveal a new ejection from that protostar, demonstrating that it drives an episodic jet. The central compact part of the other known large-scale flow in the system, oriented roughly east–west, is well delineated by the CO(6-5) emission imaged with ALMA and is confirmed to be driven from within component A. Finally, a one-sided blueshifted bubble-like outflow structure is detected here for the first time from source B to the north-west of the system. Its very short dynamical time-scale (∼200 yr), low velocity and moderate collimation support the idea that source B is the youngest object in the system, and possibly one of the youngest protostars known.

Keywords: techniques: interferometric; stars: formation; stars: individual: IRAS 16293−2422; ISM: jets and outflows

Journal Article.  4095 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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