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Line emission from filaments in molecular clouds

Priestley, F. D., Arzoumanian, D. and Whitworth, A. P. ORCID: https://orcid.org/0000-0002-1178-5486 2023. Line emission from filaments in molecular clouds. Monthly Notices of the Royal Astronomical Society 522 (3) , pp. 3890-3897. 10.1093/mnras/stad1229

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Abstract

Filamentary structures are often identified in column density maps of molecular clouds, and appear to be important for both low- and high-mass star formation. Theoretically, these structures are expected to form in regions where the supersonic cloud-scale turbulent velocity field converges. While this model of filament formation successfully reproduces several of their properties derived from column densities, it is unclear whether it can also reproduce their kinematic features. We use a combination of hydrodynamical, chemical, and radiative transfer modelling to predict the emission properties of these dynamically forming filaments in the 13CO, HCN, and N2H+J=1−0 rotational lines. The results are largely in agreement with observations; in particular, line widths are typically subsonic to transonic, even for filaments that have formed from highly supersonic inflows. If the observed filaments are formed dynamically, as our results suggest, no equilibrium analysis is possible, and simulations that presuppose the existence of a filament are likely to produce unrealistic results.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Funders: STFC
Date of First Compliant Deposit: 26 April 2023
Date of Acceptance: 21 April 2023
Last Modified: 13 Mar 2024 17:23
URI: https://orca.cardiff.ac.uk/id/eprint/159059

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