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Jet rotation investigated in the near-ultraviolet with the Hubble Space Telescope imaging spectrograph
Date Issued
2012-04-20
Date Available
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.
Sponsorship
European Commission
Irish Research Council for Science, Engineering and Technology
Other Sponsorship
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
Language
English
Status of Item
Peer reviewed
ISSN
0004-637X
This item is made available under a Creative Commons License
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