Dalgleish, Hannah S, Longmore, Steven N, Peters, Thomas, Henshaw, Jonathan D, Veitch-Michaelis, Joshua L, Urquhart, J.S. (2018) Ionised gas kinematics in bipolar H II regions. Monthly Notices of the Royal Astronomical Society, 478 (3). pp. 3530-3543. ISSN 0035-8711. (doi:10.1093/mnras/sty1109)
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Official URL https://doi.org/10.1093/mnras/sty1109 |
Abstract
Stellar feedback plays a fundamental role in shaping the evolution of galaxies. Here we explore the use of ionised gas kinematics in young, bipolar H II regions as a probe of early feedback in these star-forming environments. We have undertaken a multi-wavelength study of a young, bipolar H II region in the Galactic disc, G316.81–0.06, which lies at the centre of a massive (?103 M?) infrared-dark cloud filament. It is still accreting molecular gas as well as driving a ?0.2 pc ionised gas outflow perpendicular to the filament. Intriguingly, we observe a large velocity gradient (47.81 ± 3.21 km s?1 pc?1) across the ionised gas in a direction perpendicular to the outflow. This kinematic signature of the ionised gas shows a reasonable correspondence with the simulations of young H II regions. Based on a qualitative comparison between our observations and these simulations, we put forward a possible explanation for the velocity gradients observed in G316.81–0.06. If the velocity gradient perpendicular to the outflow is caused by rotation of the ionised gas, then we infer that this rotation is a direct result of the initial net angular momentum in the natal molecular cloud. If this explanation is correct, this kinematic signature should be common in other young (bipolar) H II regions. We suggest that further quantitative analysis of the ionised gas kinematics of young H II regions, combined with additional simulations, should improve our understanding of feedback at these early stages.
Item Type: | Article |
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DOI/Identification number: | 10.1093/mnras/sty1109 |
Uncontrolled keywords: | ISM: H II regions, kinematics and dynamics - stars: massive, protostars |
Divisions: | Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences |
Depositing User: | James Urquhart |
Date Deposited: | 10 May 2018 15:50 UTC |
Last Modified: | 12 Jul 2019 08:32 UTC |
Resource URI: | https://kar.kent.ac.uk/id/eprint/66988 (The current URI for this page, for reference purposes) |
Urquhart, J.S.: | ![]() |
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