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Methanol and excited OH masers in W49N as observed using EVN

Published online by Cambridge University Press:  07 February 2024

Anna Bartkiewicz Open the ORCID record for Anna Bartkiewicz [Opens in a new window] ,
Marian Szymczak ,
Agnieszka Kobak Open the ORCID record for Agnieszka Kobak [Opens in a new window]  and
Mirosława Aramowicz
Anna Bartkiewicz*
Affiliation:
Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
Marian Szymczak
Affiliation:
Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
Agnieszka Kobak
Affiliation:
Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.
Mirosława Aramowicz
Affiliation:
Astronomical Institute, Department of Physics and Astronomy, University of Wrocław, Kopernika 11, 51-622 Wrocław, Poland
*
email: [email protected]
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Abstract

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We imaged the excited OH maser line at 6.035 GHz associated with the 6.7 GHz methanol masers in a selected sample of high-mass young stellar objects using the European VLBI Network. The excited OH emission was found in a survey of methanol maser sources carried out since 2018 with the Torun 32-m telescope. The overlap of radial velocities of spectral features of methanol and excited OH suggested that both lines arose in the same volume of gas, therefore, we verified this hypothesis with the interferometric data. Here, we present the first images at the milliarcsecond scale of both maser transitions and identify the Zeeman pairs at the ex-OH line estimating the strength of the magnetic field in G43.149+00.013 (W49N).

Keywords

methanol maserexited OH masermagnetic fieldZeeman pairs
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S380: Cosmic Masers: Proper Motion toward the Next-Generation Large Projects , December 2022 , pp. 207 - 209
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

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