70 citations · 147 across the 10 of their papers we have counts for
4 papers · 1 filter
First detections of methanol maser lines from a rare transition family
Bradley R. Johnson, Simon P. Ellingsen, Shari L. Breen +3
We report the first observations in a rare family of class II methanol maser transitions in both CHOH and CHOH toward three southern high-mass star formation regions…
Compact vs. Scattered: Suitability of Southern 6.7GHz Methanol Masers for VLBI astrometry
Lucas J. Hyland, Simon P. Ellingsen, Mark J. Reid
The 6.7~GHz methanol maser transition is exclusively associated with young, high-mass stars and represents a potential target for astrometric studies, including accurate determinat…
The Expanding 3 kpc Arms Are Neither Expanding nor Spiral Arms but X1 Orbits Driven by the Galactic Bar
Jayender Kumar, Mark J. Reid, T. M. Dame +6
Near the center of our Milky Way is a bar-like structure and the so-called Expanding 3-kpc arms. We currently have limited knowledge of this important region, since we are about 8.…
The Extraordinary Maser Flaring Event in the Massive Protostellar System NGC6334I: Multi-Epoch Milliarcsecond Resolution Investigation of the 6.7-GHz Methanol Masers
Jayender Kumar, Simon P. Ellingsen, Gabor Orosz +4
We report the first multi-epoch milliarcsecond resolution imaging of the 6.7-GHz class II methanol maser emission associated with the high-mass protocluster system NGC6334I. The ob…