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Shape Analysis of HII Regions — II. Synthetic Observations

Campbell-White, Justyn, Ali, Ahmad A., Froebrich, Dirk, Kume, Alfred (2020) Shape Analysis of HII Regions — II. Synthetic Observations. Monthly Notices of the Royal Astronomical Society, 496 (4). pp. 4311-4329. ISSN 0035-8711. E-ISSN 1365-2966. (doi:10.1093/mnras/staa1701) (KAR id:81678)

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The statistical shape analysis method developed for probing the link between physical parameters and morphologies of Galactic HII regions is applied here to a set of synthetic observations (SOs) of a numerically modelled HII region. The systematic extraction of HII region shape, presented in the first paper of this series, allows for a quantifiable confirmation of the accuracy of the numerical simulation, with respect to the real observational counterparts of the resulting SOs. A further aim of this investigation is to determine whether such SOs can be used for direct interpretation of the observational data, in a future supervised classification scheme based upon HII region shape. The numerical HII region data was the result of photoionisation and radiation pressure feedback of a 34 M\(_\bigodot\) star, in a 1000 M\(_\bigodot\) cloud. The SOs analysed herein comprised four evolutionary snapshots (0.1, 0.2, 0.4 and 0.6 Myr), and multiple viewing projection angles. The shape analysis results provided conclusive evidence of the efficacy of the numerical simulations. When comparing the shapes of the synthetic regions to their observational counterparts, the SOs were grouped in amongst the Galactic HII regions by the hierarchical clustering procedure. There was also an association between the evolutionary distribution of regions and the respective groups. This suggested that the shape analysis method could be further developed for morphological classification of HII regions by using a synthetic data training set, with differing initial conditions of well-defined parameters.

Item Type: Article
DOI/Identification number: 10.1093/mnras/staa1701
Uncontrolled keywords: Astrophysics of Galaxies, Instrumentation and Methods for Astrophysics, Solar and Stellar Astrophysics
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: Dirk Froebrich
Date Deposited: 12 Jun 2020 09:46 UTC
Last Modified: 09 Dec 2022 05:37 UTC
Resource URI: (The current URI for this page, for reference purposes)

University of Kent Author Information

Campbell-White, Justyn.

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Froebrich, Dirk.

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Kume, Alfred.

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