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The SEDIGISM survey: Molecular cloud morphology. II: Integrated source properties

Neralwar, K.R., Colombo, D., Duarte-Cabral, A., Urquhart, J.S., Mattern, M., Wyrowski, F., Menten, K.M., Barnes, P., Sánchez-Monge, Á., Rigby, A.J., and others. (2022) The SEDIGISM survey: Molecular cloud morphology. II: Integrated source properties. Astronomy & Astrophysics, 664 . Article Number A84. ISSN 0004-6361. (doi:10.1051/0004-6361/202142513) (KAR id:94893)

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The Structure, Excitation, and Dynamics of the Inner Galactic InterStellar Medium (SEDIGISM) survey has produced high (spatial and spectral) resolution 13CO (2–1) maps of the Milky Way. It has allowed us to investigate the molecular interstellar medium in the inner Galaxy at an unprecedented level of detail and characterise it into molecular clouds. In a previous paper, we have classified the SEDIGISM clouds into four morphologies. However, how the properties of the clouds vary for these four morphologies is not well understood. Here, we use the morphological classification of SEDIGISM clouds to find connections between the cloud morphologies, their integrated properties, and their location on scaling relation diagrams. We observe that ring-like clouds show the most peculiar properties, having, on average, higher masses, sizes, aspect ratios and velocity dispersions compared to other morphologies. We speculate that this is related to the physical mechanisms that regulate their formation and evolution, for example, turbulence from stellar feedback can often results in the creation of bubble-like structures. We also see a trend of morphology with virial parameter whereby ring-like, elongated, clumpy and concentrated clouds have virial parameters in a decreasing order. Our findings provide a foundation for a better understanding of the molecular cloud behaviour based on their measurable properties.

Item Type: Article
DOI/Identification number: 10.1051/0004-6361/202142513
Uncontrolled keywords: ISM: clouds – local insterstellar matter – ISM: bubbles – Submillimeter: ISM
Subjects: Q Science
Q Science > QB Astronomy
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: James Urquhart
Date Deposited: 06 May 2022 09:01 UTC
Last Modified: 10 Jan 2024 11:46 UTC
Resource URI: (The current URI for this page, for reference purposes)

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