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First Interferometric Images of the 36 GHz Methanol Masers in the DR21 Complex
Vincent L. Fish, Talitha C. Muehlbrad, Preethi Pratap +4
Class I methanol masers are believed to be produced in the shock-excited environment around star-forming regions. Many authors have argued that the appearance of various subsets of…
1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-Variable Emission on Event Horizon Scales
Vincent L. Fish, Sheperd S. Doeleman, Christopher Beaudoin +27
Sagittarius A*, the ~4 x 10^6 solar mass black hole candidate at the Galactic Center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength Very Long Baseli…
Discovery of the first methanol (CH3OH) maser in the Andromeda galaxy (M31)
Lorant O. Sjouwerman, Claire E. Murray, Ylva M. Pihlstrom +2
We present the first detection of a 6.7 GHz Class II methanol (CH3OH) maser in the Andromeda galaxy (M31). The CH3OH maser was found in a Very Large Array (VLA) survey during the f…
Global VLBI Observations of the 6.0 GHz Hydroxyl Masers in Onsala 1
Vincent L. Fish, Loránt O. Sjouwerman
We present global VLBI observations of the first-excited state OH masers in the massive star-forming region Onsala 1 (ON 1). The 29 masers detected are nearly all from the 6035 MHz…
Expanded VLA Detection of 36.2 GHz Class I Methanol Masers in Sagittarius A
Lorant O. Sjouwerman, Ylva M. Pihlstrom, Vincent L. Fish
We report on the interferometric detection of 36.2 GHz Class I methanol emission with the new 27-40 GHz Ka band receivers available on the Expanded Very Large Array (EVLA). The bri…