Eden, D. J., Moore, T. J. T., Plume, R., Rigby, A. J., Urquhart, J. S., Marsh, K. A., Peñaloza, C. H., Clark, P. C., Smith, M. W. L., Tahani, K., Ragan, S. E., Thompson, M. A., Johnstone, D., Parsons, H. and Rani, R.
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.
10.1093/mnras/staa3188
|
Abstract
We have used the ratio of column densities (CDR) derived independently from the 850-mum continuum JCMT Plane Survey (JPS) and the 13CO/C18O (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 ℓ = 30○ and ℓ = 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.
Stars: formation, ISM: individual objects: W43, ISM: kinematics and dynamics, submillimetre: ISM
| Item Type: |
Article
|
| Date Type: |
Publication |
| Status: |
Published |
| Schools: |
Physics and Astronomy |
| Publisher: |
Oxford University Press |
| ISSN: |
0035-8711 |
| Date of First Compliant Deposit: |
23 October 2020 |
| Date of Acceptance: |
10 October 2020 |
| Last Modified: |
19 Nov 2020 14:34 |
| URI: |
http://orca.cf.ac.uk/id/eprint/135895 |
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