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The magnetic field of IRAS 16293-2422 as traced by shock-induced H2O masers

Published online by Cambridge University Press:  24 July 2012

Felipe O. Alves
Affiliation:
Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, D-53121, Bonn, Germany email: falves@astro.uni-bonn.de
Wouter H. T. Vlemmings
Affiliation:
Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden email: vlemmings@chalmers.se
Josep M. Girart
Affiliation:
Institut de Ciències de l'Espai (IEEC-CSIC), Campus UAB, Facultat de Ciències, C5 par 2a, 08193 Bellaterra, Catalunya, Spain email: girart@ice.cat
José M. Torrelles
Affiliation:
Institut de Ciències de l'Espai (CSIC)-UB/IEEC, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain email: torrelles@ieec.cat
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Abstract

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H2O masers are important magnetic field tracers in very high density gas. We show one of the first magnetic field determinations at such high density in a low-mass protostar: IRAS 16293-2422. We used the Very Large Array (VLA) to carry out spectro-polarimetric observations of the 22 GHz Zeeman emission of H2O masers. A blend of at least three maser features can be inferred from our data. They are excited in zones of compressed gas produced by shocks between the outflows ejected by this source and the ambient gas. The post-shock particle density is in the range 1 - 3 × 109 cmt−3, and the line-of-sight component of the magnetic field is estimated as ~ 113 mG. The outflow dynamics is likely magnetically dominated.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

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