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Characteristic scale of star formation – I. Clump formation efficiency on local scales

Eden, D.J., Moore, T.J.T., Plume, R., Rigby, A.J., Urquhart, J.S., Marsh, K.A., Peñaloza, M.A., Johnstone, D., Parsons, H., Rani, R. and others. (2021) Characteristic scale of star formation – I. Clump formation efficiency on local scales. Monthly Notices of the Royal Astronomical Society, 500 (1). pp. 191-210. ISSN 0035-8711. (doi:10.1093/mnras/staa3188) (KAR id:83406)


We have used the ratio of column densities (CDR) derived independently from the 850-µm continuum JCMT Plane Survey (JPS) and the \(^{13}\)CO/C\(^{18}\)O (J = 3 → 2) Heterodyne Inner Milky Way Plane Survey (CHIMPS) to produce maps of the dense-gas mass fraction (DGMF) in two slices of the Galactic Plane centred at \(\ell\) = 30\(^◦\) and \(\ell\) = 40\(^◦\). The observed DGMF is a metric for the instantaneous clump-formation efficiency (CFE) in the molecular gas. We split the two fields into velocity components corresponding to the spiral arms that cross them, and a two-dimensional power-spectrum analysis of the spiral arm DGMF maps reveals a break in slope at the approximate size scale of molecular clouds. We interpret this as the characteristic scale of the amplitude of variations in the CFE and a constraint on the dominant mechanism regulating the CFE and, hence, the star-formation efficiency in CO-traced clouds.

Item Type: Article
DOI/Identification number: 10.1093/mnras/staa3188
Uncontrolled keywords: Stars: formation – ISM: individual objects: W43 – ISM: kinematics and dynamics – submillimetre: ISM
Subjects: Q Science > QB Astronomy
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: James Urquhart
Date Deposited: 13 Oct 2020 10:12 UTC
Last Modified: 04 Mar 2024 15:43 UTC
Resource URI: (The current URI for this page, for reference purposes)

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