Near-IR imaging and spectroscopy of DR 21: A case for supersonic turbulence

Davis, C.J. and Smith, M.D. (1996) Near-IR imaging and spectroscopy of DR 21: A case for supersonic turbulence. Astronomy and Astrophysics, 310 (3). pp. 961-969. ISSN 0004-6361. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

New, H2 v=1-0 S(1) narrow-band and K-band images of one of the most massive and most energetic YSO outflows known, DR 21, are presented. We also present H2 line profiles at positions across both outflow lobes. The complex, turbulent nature of the outflow is clearly evident in both the images and the line profiles. Remarkable asymmetries in the line profiles and oscillations in the line peak velocities are measured, particularly in the southwestern outflow lobe. We model the profiles with both planar and unresolved, bow shaped shocks. Also, from our data, and from a consideration of earlier work, two outflow episodes are inferred: an early jet produces a narrow cone-like flow towards the southwest, and a late core-dispersal phase generates the supersonic turbulence, observed here through wide, oscillating profiles from planar shock waves. These two phases are being increasingly recognised in other outflows from deeply-embedded stars.

Item Type: Article
Uncontrolled keywords: Infrared: interstellar: lines, Infrared: stars, ISM: DR 21, ISM: jets and outflows, ISM: molecules, Shock waves
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Giles Tarver
Date Deposited: 11 Aug 2015 10:38 UTC
Last Modified: 12 Aug 2015 16:18 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50158 (The current URI for this page, for reference purposes)
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