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Diversity of chemistry and excitation conditions in the high-mass star forming complex W33
K. Immer, R. Galván-Madrid, C. König +2
The object W33 is a giant molecular cloud that contains star forming regions at various evolutionary stages from quiescent clumps to developed H II regions. Since its star forming…
Trigonometric Parallaxes of Star Forming Regions in the Scutum Spiral Arm
M. Sato, Y. W. Wu, K. Immer +6
We report measurements of trigonometric parallaxes for six high-mass star-forming regions in the Scutum spiral arm of the Milky Way as part of the BeSSeL Survey. Combining our meas…
Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
M. J. Reid, K. M. Menten, A. Brunthaler +13
Over 100 trigonometric parallaxes and proper motions for masers associated with young, high-mass stars have been measured with the BeSSeL Survey, a VLBA key science project, the EV…
The cometary HII regions of DR 21: Bow shocks or champagne flows or both?
K. Immer, C. Cyganowski, M. J. Reid +1
We present deep Very Large Array H66 radio recombination line (RRL) observations of the two cometary HII regions in DR 21. With these sensitive data, we test the "hybrid" bow sh…