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Parallaxes and proper motions of interstellar masers toward the Cygnus X star-forming complex. I. Membership of the Cygnus X region
K. L. J. Rygl, A. Brunthaler, A. Sanna +6
Whether the Cygnus X complex consists of one physically connected region of star formation or of multiple independent regions projected close together on the sky has been debated f…
VLBA SiO maser observations of the OH/IR star OH 44.8-2.3: magnetic field and morphology
N. Amiri, W. H. T. Vlemmings, A. J. Kemball +1
SiO maser emission occurs in the extended atmosphere of evolved stars and can be studied at high angular resolution. Very long baseline interferometry (VLBI) observations of Mira v…
The properties and polarization of the H2O and CH3OH maser environment of NGC7538-IRS1
G. Surcis, W. H. T. Vlemmings, R. M. Torres +2
NGC7538 is a complex massive star-forming region. The region is composed of several radio continuum sources, one of which is IRS1, a high-mass protostar, from which a 0.3 pc molecu…
Periodic variability of 6.7GHz methanol masers in G22.357+0.066
M. Szymczak, P. Wolak, A. Bartkiewicz +1
We report the discovery of periodic flares of 6.7GHz methanol maser in the young massive stellar object G22.357+0.066. The target was monitored in the methanol maser line over 20 m…
Distribution and excitation of thermal methanol in 6.7 GHz maser bearing star-forming regions; I. The nearby source Cepheus A
Karl J. E. Torstensson, Floris F. S. van der Tak, Huib Jan van Langevelde +2
The aim of this study is to investigate the distribution and excitation of the methanol gas around Cep A and to describe the physical conditions of the region. In addition the larg…
Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022
M. Giroletti, Z. Paragi, H. Bignall +16
There is growing evidence of relativistic jets in radio-loud narrow-line Seyfert 1 (RL-NLS1) galaxies. We constrain the observational properties of the radio emission in the first…