Magnetic field measurements around massive young stellar objects with the EVN
Journal
Date Issued
2018
Author(s)
Abstract
Although there has been significant progresses in the last years, the formation process of highmass stars (M>8 Msun) is still unclear. This is mainly due to the fast evolution and large distances
of the massive young stellar objects (YSOs) that make difficult to observe, with fine details, a
sufficient number of massive YSOs at each evolutionary stages. However, in the last 10 years
some pieces of information regarding the gas motion and the magnetic field close to the YSOs
have been gathered by observing and analyzing the maser emission of mainly water and methanol
molecules. In particular, we have performed full polarization observations of 6.7 GHz methanol
masers and/or 22 GHz water maser with the European VLBI Network (EVN) towards a large
number of sources in order to provide measurements of magnetic fields orientation and strength
at milliarcsecond resolution around massive protostars. These measurements can be made at this
high angular resolution only by observing and analyzing the polarized emission of masers. From
the linearly and circularly polarized emissions we can determine the orientation and the strength
of the magnetic field, respectively. Here, we present the updated statistics of the possible alignment between the magnetic field and the bipolar outflows ejected from the massive protostars. In
addition, and for the first time, we will provide lower limits of the magnetic field strength measured from the Zeeman-splitting of the methanol maser by using the very recently determined
Landé g-factors for the methanol maser transitions. Furthermore, the up-to-date results of the
monitoring project of the 22 GHz water masers detected towards the massive star-forming region
W75N(B) will be also presented.
Coverage
14th European VLBI Network Symposium & Users Meeting (EVN 2018)
Volume
344
Start page
3
Conferenece
14th European VLBI Network Symposium & Users Meeting (EVN 2018)
Conferenece place
Granada, Spagna
Conferenece date
8-11 Ottobre, 2018
Issn Identifier
1824-8039
Ads BibCode
2018evn..confE...3S
Rights
open.access
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