Jet rotation investigated in the near-ultraviolet with the Hubble Space Telescope imaging spectrograph

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Title: Jet rotation investigated in the near-ultraviolet with the Hubble Space Telescope imaging spectrograph
Authors: Coffey, DeirdreRigliaco, ElisabettaBacciotti, FrancescaRay, Thomas P.Eislöffel, Jochen
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Date: 20-Apr-2012
Online since: 2019-10-17T08:55:28Z
Abstract: We present results of the second phase of our near-ultraviolet investigation into protostellar jet rotation using the Hubble Space Telescope Imaging Spectrograph. We obtain long-slit spectra at the base of five T Tauri jets to determine if there is a difference in radial velocity between the jet borders which may be interpreted as a rotation signature. These observations are extremely challenging and push the limits of current instrumentation, but have the potential to provide long-awaited observational support for the magnetocentrifugal mechanism of jet launching in which jets remove angular momentum from protostellar systems. We successfully detect all five jet targets (from RW Aur, HN Tau, DP Tau, and CW Tau) in several near-ultraviolet emission lines, including the strong Mg II doublet. However, only RW Aur's bipolar jet presents a sufficiently high signal-to-noise ratio to allow for analysis. The approaching jet lobe shows a difference of 10kms-1 in a direction which agrees with the disk rotation sense, but is opposite to previously published optical measurements for the receding jet. The near-ultraviolet difference is not found six months later, nor is it found in the fainter receding jet. Overall, in the case of RW Aur, differences are not consistent with a simple jet rotation interpretation. Indeed, given the renowned complexity and variability of this system, it now seems likely that any rotation signature is confused by other influences, with the inevitable conclusion that RW Aur is not suited to a jet rotation study. © 2012. The American Astronomical Society. All rights reserved.
Funding Details: European Commission
Irish Research Council for Science, Engineering and Technology
metadata.dc.description.othersponsorship: Italian Space Agency
Type of material: Journal Article
Publisher: IOP Publishing
Journal: Astrophysical Journal
Volume: 749
Issue: 2
Start page: 139
End page: 139
Copyright (published version): 2012 the American Astronomical Society
Keywords: ISMJetOutflowsStarsFormationIndividualRW AurHN TauDP TauCW TauPre-main sequence
DOI: 10.1088/0004-637X/749/2/139
Language: en
Status of Item: Peer reviewed
Appears in Collections:Physics Research Collection

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