The kinematic relationship between disk and jet in the DG Tauri system
L. Testi, F. Bacciotti, A.I. Sargent, T.P. Ray, J. Eisloeffel
We present high angular resolution millimeter wavelength continuum
and 13CO(2-1) observations of the circumstellar disk
surrounding the TTauri star DG Tauri. We show that
the velocity pattern in the inner regions of the disk is consistent
with Keplerian rotation about a central 0.67 Msun star.
The disk rotation is also consistent
with the toroidal velocity pattern in the initial channel of the optical
jet, as inferred from HST spectra of the first de-projected 100 AU from the
source. Our observations support the tight relationship between disk
kinematics postulated by the popular magneto-centrifugal models for jet
formation and collimation.