MAGMO: Coherent magnetic fields in the star-Forming regions of the Carina-Sagittarius spiral arm tangent

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DOIResolve DOI: http://doi.org/10.1111/j.1365-2966.2012.21722.x
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
Volume425
Issue4
Pages25302547; # of pages: 18
AbstractWe present the pilot results of the 'MAGMO' project, targeted observations of ground-state hydroxyl masers towards sites of 6.7-GHz methanol maser emission in the Carina-Sagittarius spiral arm tangent, Galactic longitudes 280° to 295°. The 'MAGMO' project aims to determine if Galactic magnetic fields can be traced with Zeeman splitting of masers associated with star formation. Pilot observations of 23 sites of methanol maser emission were made, with the detection of ground-state hydroxyl masers towards 11 of these and six additional offset sites. Of these 17 sites, nine are new detections of sites of 1665-MHz maser emission, three of them accompanied by 1667-MHz emission. More than 70 per centof the maser features have significant circular polarization, whilst only ~10 per cent have significant linear polarization (although some features with up to 100 per cent linear polarization are found). We find 11 Zeeman pairs across six sites of high-mass star formation with implied magnetic field strengths between -1.5 and +3.8 mG and a median field strength of +1.6 mG. Our measurements of Zeeman splitting imply that a coherent field orientation is experienced by the maser sites across a distanc of 5.3 ± 2.0 kpc within the Carina-Sagittarius spiral arm tangent. © 2012 CSIRO.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269182
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Record identifiere0a8856b-08dc-453e-a389-71272953e0c2
Record created2013-12-12
Record modified2016-05-09
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