6 papers · 1 filter
Distances to Galactic methanol masers
K. L. J. Rygl, A. Brunthaler, K. M. Menten +2
We present the first EVN parallax measurements of 6.7 GHz methanol masers in star forming regions of the Galaxy. The 6.7 GHz methanol maser transition is a very valuable astrometri…
The nature of the methanol maser ring G23.657-00.127
A. Bartkiewicz, A. Brunthaler, M. Szymczak +2
Methanol masers are associated with young high-mass stars and are an important tool for investigating the process of massive star formation. The recently discovered methanol maser…
Is there a Supermassive Black Hole at the Center of the Milky Way?
Mark J. Reid
This review outlines the observations that now provide an overwhelming scientific case that the center of our Milky Way Galaxy harbors a supermassive black hole. Observations at in…
Towards a kinematic model of the Local Group
A. Brunthaler, M. J. Reid, H. Falcke +2
Measuring the proper motions and geometric distances of galaxies within the Local Group is very important for our understanding of the history, present state and future of the Loca…
Large Magnetic Fields and Motions of OH Masers in W75 N
Vincent L. Fish, Mark J. Reid
We report on a second epoch of VLBA observations of the 1665 and 1667 MHz OH masers in the massive star-forming region W75 N. We find evidence to confirm the existence of very stro…
Recent Progress on a New Geometric Distance to NGC 4258
E. M. L. Humphreys, A. L. Argon, L. J. Greenhill +2
We report on our ongoing, high-resolution study of H2O masers in the innermost parsec of NGC 4258. Over thirty epochs of VLBA and VLA data, taken over six years, are being used to…