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Magnetic field measurements at milliarcsecond resolution around massive young stellar objects

G. Surcis ; Wouter Vlemmings (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; H. J. van Langevelde ; B. Hutawarakornkramer ; A. Bartkiewicz ; H. Engelkamp
Proceedings of Science. 12th European VLBI Network Symposium and Users Meeting, EVN 2014 ; Cagliari; Italy; 7-10 October 2014 (18248039). Vol. Part F113821 (2014), p. Artno 041.
[Konferensbidrag, övrigt]

Magnetic fields have only recently been included in theoretical simulations of high-mass star formation. The simulations show that magnetic fields can play a crucial role not only in the formation and dynamics of molecular outflows, but also in the evolution of circumstellar disks. Therefore, new measurements of magnetic fields at milliarcsecond resolution close to massive young stellar objects (YSOs) are fundamental for providing new input for numerical simulations and for understanding the formation process of massive stars. The polarized emission of 6.7 GHz CH3OH masers allows us to investigate the magnetic field close to the massive YSO where the outflows and disks are formed. Recently, we have detected with the EVN CH3OH maser polarized emission towards 10 massive YSOs. From a first statistical analysis we have found evidence that magnetic fields are primarily oriented along the molecular outflows. To improve our statistics we are carrying on a large observational EVN campaign for a total of 19 sources, the preliminary results of the first seven sources are presented in this contribution. Furthermore, we also describe our efforts to estimate the Landé g-factors of the CH3OH maser transition to determine the magnetic field strength from our Zeeman-splitting measurements. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.



Denna post skapades 2017-05-17.
CPL Pubid: 249378

 

Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium (2010-2017)

Ämnesområden

Hållbar utveckling
Astronomi, astrofysik och kosmologi

Chalmers infrastruktur