Tools
Tools
Eden, DJ, Moore, TJT, Plume, R, Rigby, AJ, Urquhart, JS, Marsh, KA, Penaloza, CH, Clark, PC, Smith, MWL, Tahani, K, Ragan, SE, Thompson, MA, Johnstone, D, Parsons, H and Rani, R (2020) 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
|
Text
Eden_2021_MNRAS_Characteristics_scale.pdf - Published Version Download (5MB) | Preview |
Abstract
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.
| Item Type: | Article |
|---|---|
| Additional Information: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| Related URLs: | |
| Date Deposited: | 22 Nov 2021 11:26 |
| Last Modified: | 22 Nov 2021 11:26 |
| DOI or ID number: | 10.1093/mnras/staa3188 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/15812 |
 |
View Item |