The source of the bipolar outflow in Cepheus A
Open Access
- 1 September 1984
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 210 (2) , 425-438
- https://doi.org/10.1093/mnras/210.2.425
Abstract
High-resolution MERLIN maps are presented of the OH and H2O masers in Cepheus A. These masers occur in four well-defined groups associated with four of the ultracompact H II regions in Cep A. From the present measurements it appears that the most compact of the H II regions is the source of the large-scale bipolar outflow which has been observed in CO, and that the outflow is collimated within ∼ 1015 cm of the central young star. The bipolar outflow is aligned in position angle with the interstellar magnetic-field lines, and the collapsing molecular cloud is oriented at right angles to the field lines. A similar configuration is found in many other bipolar sources. This suggests that the interstellar magnetic field has played an important role in the evolution of these sources.Keywords
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