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

D. J. Eden; T. J. T. Moore; R. Plume; A. J. Rigby; J. S. Urquhart; K. A. Marsh; C. H. Peñaloza; P. C. Clark; M. W. L. Smith; K. Tahani; S. E. Ragan; M. A. Thompson; D. Johnstone; H. Parsons; R. Rani

doi:10.1093/mnras/staa3188

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

D. J. Eden, T. J. T. Moore, R. Plume, A. J. Rigby, J. S. Urquhart, K. A. Marsh, C. H. Peñaloza, P. C. Clark, M. W. L. Smith, K. Tahani, S. E. Ragan, M. A. Thompson, D. Johnstone, H. Parsons, R. Rani

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Abstract

We have used the ratio of column densities (CDR) derived independently from the 850-$\mu$m 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$^{\circ}$ and $\ell$=40$^{\circ}$. 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.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society
Volume	500
Issue number	1
Early online date	16 Oct 2020
DOIs	https://doi.org/10.1093/mnras/staa3188
Publication status	E-pub ahead of print - 16 Oct 2020

Keywords

astro-ph.GA

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10.1093/mnras/staa3188

2007.00032v2
© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review.
Accepted author manuscript, 2.71 MBLicence: Other

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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., & Rani, R. (2020). Characteristic scale of star formation. I. Clump formation efficiency on local scales. Monthly Notices of the Royal Astronomical Society, 500(1). Advance online publication. https://doi.org/10.1093/mnras/staa3188

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abstract = " We have used the ratio of column densities (CDR) derived independently from the 850-$\mu$m 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$^{\circ}$ and $\ell$=40$^{\circ}$. 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. ",

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author = "Eden, {D. J.} and Moore, {T. J. T.} and R. Plume and Rigby, {A. J.} and Urquhart, {J. S.} and Marsh, {K. A.} and Pe{\~n}aloza, {C. H.} and Clark, {P. C.} and Smith, {M. W. L.} and K. Tahani and Ragan, {S. E.} and Thompson, {M. A.} and D. Johnstone and H. Parsons and R. Rani",

note = " {\textcopyright} 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. ",

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Eden, DJ, Moore, TJT, Plume, R, Rigby, AJ, Urquhart, JS, Marsh, KA, Peñaloza, CH, Clark, PC, Smith, MWL, Tahani, K, Ragan, SE, Thompson, MA, Johnstone, D, Parsons, H & Rani, R 2020, 'Characteristic scale of star formation. I. Clump formation efficiency on local scales', Monthly Notices of the Royal Astronomical Society, vol. 500, no. 1. https://doi.org/10.1093/mnras/staa3188

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T1 - Characteristic scale of star formation. I. Clump formation efficiency on local scales

AU - Eden, D. J.

AU - Moore, T. J. T.

AU - Plume, R.

AU - Rigby, A. J.

AU - Urquhart, J. S.

AU - Marsh, K. A.

AU - Peñaloza, C. H.

AU - Clark, P. C.

AU - Smith, M. W. L.

AU - Tahani, K.

AU - Ragan, S. E.

AU - Thompson, M. A.

AU - Johnstone, D.

AU - Parsons, H.

AU - Rani, R.

N1 - © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review.

PY - 2020/10/16

Y1 - 2020/10/16

N2 - We have used the ratio of column densities (CDR) derived independently from the 850-$\mu$m 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$^{\circ}$ and $\ell$=40$^{\circ}$. 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.

AB - We have used the ratio of column densities (CDR) derived independently from the 850-$\mu$m 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$^{\circ}$ and $\ell$=40$^{\circ}$. 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.

KW - astro-ph.GA

U2 - 10.1093/mnras/staa3188

DO - 10.1093/mnras/staa3188

M3 - Article

SN - 0035-8711

VL - 500

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

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

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