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The energetics of starburst-driven outflows at z ∼ 1 from KMOS

Swinbank, A.M.; Harrison, C.M.; Tiley, A.L.; Johnson, H.L.; Smail, I.; Stott, J.P.; Best, P.N.; Bower, R.G.; Bureau, M.; Bunker, A.; Cirasuolo, M.; Jarvis, M.; Magdis, G.E.; Sharples, R.M.; Sobral, D.

The energetics of starburst-driven outflows at z ∼ 1 from KMOS Thumbnail


C.M. Harrison

A.L. Tiley

H.L. Johnson

J.P. Stott

P.N. Best

R.G. Bower

M. Bureau

A. Bunker

M. Cirasuolo

M. Jarvis

G.E. Magdis

D. Sobral


We present an analysis of the gas outflow energetics from KMOS observations of 529 main-sequence star-forming galaxies at z 1 using broad, underlying Hα and forbid- den lines of [Nii] and [Sii]. Based on the stacked spectra for a sample with median star- formation rates and stellar masses of SFR=7M⊙ / yr and M⋆ =(1.0±0.1)×1010M⊙ respectively, we derive a typical mass outflow rate of ˙Mwind =1–4M⊙ yr−1 and a mass loading of ˙Mwind / SFR=0.2–0.4. By comparing the kinetic energy in the wind with the energy released by supernovae, we estimate a coupling efficiency between the star formation and wind energetics of ǫ 0.03. The mass loading of the wind does not show a strong trend with star-formation rate over the range 2–20M⊙ yr−1, although we identify a trend with stellar mass such that dM/ dt / SFR/M0.26±0.07 ⋆ . Finally, the line width of the broad Hα increases with disk circular velocity with a sub-linear scal- ing relation FWHMbroad /v0.21±0.05. As a result of this behavior, in the lowest mass galaxies (M⋆ < ∼ 1010M⊙), a significant fraction of the outflowing gas should have suf- ficient velocity to escape the gravitational potential of the halo whilst in the highest mass galaxies (M⋆ > ∼ 1010M⊙) most of the gas will be retained, flowing back on to the galaxy disk at later times.

Journal Article Type Article
Acceptance Date May 2, 2019
Online Publication Date May 9, 2019
Publication Date Jul 31, 2019
Deposit Date May 17, 2019
Publicly Available Date May 17, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 487
Issue 1
Pages 381-393
Public URL


Accepted Journal Article (920 Kb)

Copyright Statement
© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.

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