The source of the bipolar outflow in Cepheus A

Details The source of the bipolar outflow in Cepheus A The source of the bipolar outflow in Cepheus A

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..425c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Sept. 15, 1984, p. 425-438.

Astronomy and Astrophysics

Astronomy

128

Early Stars, Interstellar Masers, Molecular Clouds, Radio Sources (Astronomy), Stellar Evolution, Stellar Winds, Astronomical Maps, Bipolarity, H Ii Regions, Hydroxyl Emission, Interstellar Magnetic Fields, Protostars, Very Long Base Interferometry, Water Masers

Scientific paper

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.

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