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VLBI maser kinematics in high-mass SFRs: G23.01–0.41

  • Alberto Sanna (a1), Luca Moscadelli (a2), Riccardo Cesaroni (a2) and Ciriaco Goddi (a3)

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.

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Keywords

VLBI maser kinematics in high-mass SFRs: G23.01–0.41

  • Alberto Sanna (a1), Luca Moscadelli (a2), Riccardo Cesaroni (a2) and Ciriaco Goddi (a3)

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