32 citations · 94 across the 10 of their papers we have counts for
10 papers
Proper motion study of the 6.7 GHz methanol maser rings. I. A sample of sources with little variation
A. Bartkiewicz, A. Sanna, M. Szymczak +5
Methanol masers at 6.7~GHz are well-known signposts of high-mass star-forming regions. [...] We aim to understand the origin of the ring-like structures outlined by methanol maser…
Seven-year periodic variations in the methanol maser line displayed by the massive protostar IRAS 20216+4104
M. Szymczak, M. Durjasz, S. Goedhart +5
Aims: We report the discovery and analysis of a periodic methanol maser in the massive protostar IRAS 20216+4104. Methods: To obtain the light curve, we used the 6.7 GHz methanol m…
Milliarcsecond structure and variability of methanol maser emission in three high-mass protostars
A Aberfelds, A Bartkiewicz, M Szymczak +5
{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…
A Keplerian disk with a four-arm spiral birthing an episodically accreting high-mass protostar
R. A. Burns, Y. Uno, N. Sakai +34
High-mass protostars (M 8 M) are thought to gain the majority of their mass via short, intense bursts of growth. This episodic accretion is thought to be faci…
Multi-frequency VLBI observations of maser lines during the 6.7~GHz maser flare in the high-mass young stellar object G24.330.14}
A. Kobak, A. Bartkiewicz, M. Szymczak +13
Recent studies have shown that 6.7 GHz methanol maser flares can be a powerful tool for verifying the mechanisms of maser production and even the specific signatures of accretion r…
Discovery of recurrent flares of 6.7 GHz methanol maser emission in Cepheus A HW2
M. Durjasz, M. Szymczak, M. Olech +1
Context: Class II methanol masers at 6.7 GHz originate close to high-mass young stellar objects (HMYSOs). Their high sensitivity to local condition variations makes them a useful m…
Detection of periodic flares in 6.7 GHz methanol masers G45.804-0.356 and G49.043-1.079
Mateusz Olech, Michał Durjasz, Marian Szymczak +1
Context: Periodicity in 6.7 GHz methanol maser sources is a rare phenomenon that was discovered during long-term monitoring programmes. Understanding the underlying processes that…
Observations of 12.2 GHz methanol masers towards northern high-mass protostellar objects
M. Durjasz, M. Szymczak, P. Wolak +1
Context. Class II methanol masers at 6.7 and 12.2 GHz occur close to high-mass young stellar objects (HMYSOs). When they are observed simultaneously, such studies may contribute to…
A search for the OH 6035 MHz line in high-mass star-forming regions
M. Szymczak, P. Wolak, A. Bartkiewicz +2
The excited states of OH masers detected in the environment of high-mass young stellar objects (HMYSOs) are important for improving our understanding of the physical conditions of…
A highly variable methanol maser in G111.256-0.770
M. Durjasz, M. Szymczak, M. Olech
G111.256-0.770 is a high-mass young stellar object associated with a weak 6.7 GHz methanol maser showing strong variability. We present results of a multi-epoch monitoring program…