VLBI maser kinematics in high-mass SFRs: G23.01-0.41
Abstract
Very Long Baseline Interferometry studies of different maser species observed at multiple epochs allow complementary measurements of the 3-dimensional velocity field of gas close (<~ 103 AU) to massive young stellar objects. Here, we review our recent results toward the high-mass star-forming region G23.01-0.41, where all the strongest molecular maser transitions known to date cluster within 2000 AU from the center of an hot molecular core and are associated with a so called extended green object. The overall maser kinematics reveals a common outflowing motion from a central object; the details of the spatial distribution and velocity field of each maser species hint at the presence of different dynamical structures: a collimated jet, a wide-angle wind, and a flattened rotating core. We further compare the simultaneous presence of maser emission from different molecular species with a recent evolutionary sequence for masers associated with massive young stellar objects.
- Publication:
-
Cosmic Masers - from OH to H0
- Pub Date:
- July 2012
- DOI:
- 10.1017/S1743921312007363
- Bibcode:
- 2012IAUS..287..396S
- Keywords:
-
- masers;
- techniques: high angular resolution;
- stars: formation;
- stars: individual (G23.01-0.41)