Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars
Date Issued
2023
Author(s)
Aberfelds, A.
•
Bartkiewicz, A.
•
Szymczak, M.
•
Šteinbergs, J.
•
•
Kobak,A.
•
Durjasz, M.
•
Shmeld, I.
Abstract
The variability study of 6.7 GHz methanol masers has become a useful way to
improve our understanding of the physical conditions in high-mass star-forming
regions. Based on the single-dish monitoring using the Irbene telescopes, we
selected three sources with close sky positions. We imaged them using the
European Very Long Baseline Interferometer Network and searched available data
on VLBI archives to follow detailed changes in their structures and single
maser spot variability. All three targets show a few groups of maser
cloudlets of a typical size of 3.5 mas and the majority of them show linear or
arched structures with velocity gradients of order 0.22 km/(s mas). The
cloudlets and overall source morphologies are remarkably stable on time scales
of 7-15 yr supporting a scenario of variability due to changes in the maser
pumping rate.
Volume
524
Issue
1
Start page
599
Issn Identifier
0035-8711
Ads BibCode
2023MNRAS.524..599A
Rights
open.access
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