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Issue A&A
Volume 394, Number 3, November II 2002
Page(s) L31 - L34
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021380



A&A 394, L31-L34 (2002)
DOI: 10.1051/0004-6361:20021380

Letter

The kinematic relationship between disk and jet in the DG Tauri system

L. Testi1, F. Bacciotti1, A. I. Sargent2, T. P. Ray3 and J. Eislöffel4

1  Osservatorio Astrofisico di Arcetri, INAF, Largo E. Fermi 5, 50125 Firenze, Italy
2  California Institute of Technology, MS 105-24, Pasadena, CA 91125, USA
3  Dublin Institute for Advanced Studies, 5 Merrion Square Dublin 2, Ireland
4  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany

(Received 21 August 2002 / Accepted 20 September 2002 )

Abstract
We present high angular resolution millimeter wavelength continuum and 13CO(2-1) observations of the circumstellar disk surrounding the T Tauri 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  $M_\odot$ 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 and jet kinematics postulated by the popular magneto-centrifugal models for jet formation and collimation.


Key words: circumstellar matter -- jets and outflows -- stars: formation -- stars: individual: DG Tauri

Offprint request: L. Testi, lt@arcetri.astro.it

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