Multi-epoch subarcsecond [Fe II] spectroimaging of the DG Tau outflows with NIFS – II. On the nature of the bipolar outflow asymmetry
Article
White, M. C., Bicknell, G. V., McGregor, P. J. and Salmeron, R. 2014. "Multi-epoch subarcsecond [Fe II] spectroimaging of the DG Tau outflows with NIFS – II. On the nature of the bipolar outflow asymmetry." Monthly Notices of the Royal Astronomical Society. 442 (1), pp. 28-42. https://doi.org/10.1093/mnras/stu788
| Article Title | Multi-epoch subarcsecond [Fe II] spectroimaging of the DG Tau outflows with NIFS – II. On the nature of the bipolar outflow asymmetry |
|---|---|
| ERA Journal ID | 1074 |
| Article Category | Article |
| Authors | White, M. C. (Author), Bicknell, G. V. (Author), McGregor, P. J. (Author) and Salmeron, R (Author) |
| Journal Title | Monthly Notices of the Royal Astronomical Society |
| Journal Citation | 442 (1), pp. 28-42 |
| Number of Pages | 15 |
| Year | 2014 |
| Publisher | Oxford University Press |
| Place of Publication | United Kingdom |
| ISSN | 0035-8711 |
| 1365-2966 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stu788 |
| Web Address (URL) | https://academic.oup.com/mnras/article/442/1/28/1226538 |
| Abstract | The origin of bipolar outflow asymmetry in young stellar objects (YSOs) remains poorly understood. It may be due to an intrinsically asymmetric outflow launch mechanism, or it may be caused by the effects of the ambient medium surrounding the YSO. Answering this question is an important step in understanding outflow launching. We have investigated the bipolar outflows driven by the T Tauri star DG Tauri on scales of hundreds of astronomical units, using the Near-infrared Integral Field Spectrograph on Gemini-North. The approaching outflow consists of a well-collimated jet, nested within a lower-velocity disc wind. The receding outflow is composed of a single-component bubble-like structure. We analyse the kinematics of the receding outflow using kinetic models, and determine that it is a quasi-stationary bubble with an expanding internal velocity field. We propose that this bubble forms because the receding counterjet from DG Tau is obstructed by a clumpy ambient medium above the circumstellar disc surface, based on similarities between this structure and those found in the modelling of active galactic nuclei outflows. We find evidence of interaction between the obscured counterjet and clumpy ambient material, which we attribute to the large molecular envelope around the DG Tau system. An analytical model of a momentum-driven bubble is shown to be consistent with our interpretation. We conclude that the bipolar outflow from DG Tau is intrinsically symmetric, and the observed asymmetries are due to environmental effects. This mechanism can potentially be used to explain the observed bipolar asymmetries in other YSO outflows. |
| Keywords | techniques: high angular resolution, techniques: imaging spectroscopy, stars: individual: DG Tauri, stars: protostars, stars: variables: T Tauri, Herbig Ae/Be, ISM: jets and outflows |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Byline Affiliations | Australian National University |
| Institution of Origin | University of Southern Queensland |
| Funding source | Australian Research Council (ARC) Grant ID 120101792 |
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