2-6 September 2024
CJD Bonn Castell
Europe/Berlin timezone
- evn2024@mpifr.de
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Contribution
Speakers
- Prof. Anna BARTKIEWICZ
Primary authors
- Prof. Anna BARTKIEWICZ (Torun Institute of Astronomy, NCU)
Co-authors
- Dr. Alberto SANNA (INAF, Osservatorio Astronomico di Cagliari)
- Prof. Huib VAN LANGEVELDE (JIVE)
- Prof. Marian SZYMCZAK (Institute of Astronomy, Nicolaus Copernicus University in Torun)
- Mrs. Agnieszka KOBAK (Institute of Astronomy, Nicolaus Copernicus University in Torun)
- Dr. Luca MOSCADELLI (INAF, Osservatorio Astrofisico di Arcetri)
- Dr. Paweł WOLAK (Institute of Astronomy, Nicolaus Copernicus University in Torun)
- Dr. Michał DURJASZ (Institute of Astronomy, Nicolaus Copernicus University in Torun)
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Content
The 6.7 GHz methanol maser distribution showing a circular morphology in high-mass star-forming regions was discovered 2 decades ago using a sensitive European VLBI Network. Today, after multi-epoch observations, we derive the proper motions of single-masing cloudlets at the level of several kilometres per second. The motions are directed radially outward from the centres of fillet ellipses indicating that expansion motions dominate. After detailed analysis, we state that the maser spot distribution alone does not allow for a direct interpretation of the ongoing scenario. With the results, we can not distinguish, if the rings trace the outflows or are related to disc-winds. There is a need for complementary angular resolution images.