Kinematics of the H2O Masers in W49N: Analysis of the Velocity Variance-Covariance Matrix

Details Kinematics of the H2O Masers in W49N: Analysis of the Velocity Variance-Covariance Matrix Kinematics of the H2O Masers in W49N: Analysis of the Velocity Variance-Covariance Matrix

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...533..893b&link_type=abstract

The Astrophysical Journal, Volume 533, Issue 2, pp. 893-896.

Astronomy and Astrophysics

Astronomy

11

Ism: H Ii Regions, Ism: Individual (W49N), Ism: Kinematics And Dynamics, Masers, Radio Lines: Ism, Techniques: Interferometric

Scientific paper

The proper motions of the H2O masers in W49N have been measured with multiepoch very long baseline interferometry (VLBI) by Gwinn, Moran, & Reid. The number of motions derived is large (105), and the spatial coverage of the source by maser spots is excellent, making W49N a natural candidate for analytic tools based on diagonalization of the velocity variance-covariance matrix (VVCM). The velocity dispersions (or internal relative velocities) used in VVCM analysis are the quantities directly determined by VLBI proper motion experiments, which lack an absolute phase reference. I apply the VVCM diagonalization procedure to the H2O masers in W49N, deriving in an objective, model-independent way the kinematic axes of the outflow. I then compare these local axes with various geometrical axes suggested by the morphology of an apparent ``ring'' of H II regions that accompany the one containing H2O masers, and with the axis of the large-scale outflow seen in molecular emission. I also present kinematic evidence not revealed by previous modeling for pronounced asymmetry of the collimating mechanism that channels the maser outflow, and propose an explanation in terms of magnetic drag.

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