Characteristic scale of star formation – I. Clump formation efficiency on local scales-Reference-Cited by-同舟云学术

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

Published:2020-10-16 Issue:1 Volume:500 Page:191-210
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Eden D J¹^ORCID,Moore T J T¹,Plume R²,Rigby A J³^ORCID,Urquhart J S⁴^ORCID,Marsh K A³⁵,Peñaloza C H³⁶,Clark P C³^ORCID,Smith M W L³^ORCID,Tahani K⁷,Ragan S E³,Thompson M A⁸,Johnstone D⁹¹⁰,Parsons H¹¹,Rani R¹

Affiliation:

1. Astrophysics Research Institute, Liverpool John Moores University, IC2, Liverpool Science Park, 146 Brownlow Hill, Liverpool L3 5RF, UK

2. Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada

3. School of Physics and Astronomy, Cardiff University, Cardiff CF24 3AA, UK

4. School of Physical Sciences, Ingram Building, University of Kent, Canterbury, Kent CT2 7NH, UK

5. Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA

6. SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK

7. Department of Physics and Astronomy, Kwantlen Polytechnic University, 12666 72nd Avenue, Surrey, BC V3W 2M8, Canada

8. Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK

9. NRC Herzberg Astronomy and Astrophysics Centre, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada

10. Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada

11. East Asian Observatory, 660 North A’ohoku Place, Hilo, Hawaii 96720, USA

Abstract

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.

Funder

Science and Technology Facilities Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

http://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/staa3188/33902967/staa3188.pdf

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