Rotation of jets from young stars: New clues from the Hubble Space Telescope Imaging Spectrograph

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Title: Rotation of jets from young stars: New clues from the Hubble Space Telescope Imaging Spectrograph
Authors: Coffey, DeirdreBacciotti, FrancescaWoitas, JensRay, Thomas P.Eislöffel, Jochen
Permanent link: http://hdl.handle.net/10197/11156
Date: 1-Apr-2004
Online since: 2019-10-17T13:27:33Z
Abstract: We report findings from the first set of data in a current survey to establish conclusively whether jets from young stars rotate. We observed the bipolar jets from the T Tauri stars TH 28 and RW Aur and the blueshifted jet from T Tauri star LkHα 321, using the Hubble Space Telescope Imaging Spectrograph. Forbidden emission lines show distinct and systematic velocity asymmetries of 10-25 (±5) km s-1 at a distance of 0″.3 from the source, representing a (projected) distance of ≈40 AU along the jet in the case of RW Aur, ≈50 AU for TH 28, and 165 AU in the case of LkHα 321. These velocity asymmetries are interpreted as rotation in the initial portion of the jet where it is accelerated and collimated. For the bipolar jets, both lobes appear to rotate in the same direction. Values obtained were in agreement with the predictions of MHD disk-wind models. Finally, we determine, from derived toroidal and poloidal velocities, values for the distance from the central axis of the footpoint for the jet's low-velocity component of ≈0.5-2 AU, consistent with the models of magnetocentrifugal launching.
Funding Details: Enterprise Ireland
metadata.dc.description.othersponsorship: Deutsches Zentrum für Luft- und Raumfahrt
Type of material: Journal Article
Publisher: IOP Publishing
Journal: The Astrophysical Journal
Volume: 604
Issue: 2 I
Start page: 758
End page: 765
Copyright (published version): 2004 The American Astronomical Society
Keywords: JetsOutflowsStarsFormationIndividualPre-main sequenceLkH 321RWAurigae
DOI: 10.1086/382019
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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