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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Characteristic scale of star formation – I. Clump formation efficiency on local scales
Monthly Notices of the Royal Astronomical Society, Volume 500, No. 1, Year 2021
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Description
We have used the ratio of column densities derived independently from the 850-μm continuum James Clerk Maxwell Telescope Plane Survey and the 13CO/C18O (J = 3 → 2) Heterodyne Inner Milky Way Plane Survey to produce maps of the dense-gas mass fraction (DGMF) in two slices of the Galactic plane centred at l= 30◦ and 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. © 2020 The Author(s).
Authors & Co-Authors
Eden, David J.
United Kingdom, Liverpool
Liverpool John Moores University
Moore, Toby J.T.
United Kingdom, Liverpool
Liverpool John Moores University
Rigby, Andrew J.
United Kingdom, Cardiff
Cardiff University
Urquhart, James S.
United Kingdom, Canterbury
University of Kent
Clark, Paul C.
United Kingdom, Cardiff
Cardiff University
Smith, Matthew W.L.
United Kingdom, Cardiff
Cardiff University
Thompson, Mark A.
United Kingdom, Hatfield
University of Hertfordshire
Johnstone, Doug I.
Canada, Ottawa
National Research Council Canada
Canada, Victoria
University of Victoria
Parsons, Harriet A.L.
United States, Hilo
East Asian Observatory
Statistics
Citations: 4
Authors: 9
Affiliations: 11
Identifiers
Doi:
10.1093/mnras/staa3188
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative