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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2021

Stellar feedback in a clumpy galaxy at z 3.4

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E. Iani
  • Function : Author
A. Zanella
J. Vernet
  • Function : Author
M. Gronke
  • Function : Author
C. M. Harrison
  • Function : Author
F. Arrigoni-Battaia
  • Function : Author
G. Rodighiero
  • Function : Author
A. Burkert
  • Function : Author
M. Behrendt
  • Function : Author
Chian-Chou Chen
  • Function : Author
P. Hibon
  • Function : Author
M. Hilker
  • Function : Author
E. Le Floc'H
  • Function : Author
V. Mainieri
  • Function : Author
A. M. Swinbank
  • Function : Author
F. Valentino
  • Function : Author
E. Vanzella
  • Function : Author
M. A. Zwaan
  • Function : Author

Abstract

Giant star-forming regions (clumps) are widespread features of galaxies at z ≍ 1-4. Theory predicts that they can play a crucial role in galaxy evolution, if they survive to stellar feedback for >50 Myr. Numerical simulations show that clumps' survival depends on the stellar feedback recipes that are adopted. Up to date, observational constraints on both clumps' outflows strength and gas removal time-scale are still uncertain. In this context, we study a line-emitting galaxy at redshift z ≃ 3.4 lensed by the foreground galaxy cluster Abell 2895. Four compact clumps with sizes ≲280 pc and representative of the low-mass end of clumps' mass distribution (stellar masses ≲2 × 108 M) dominate the galaxy morphology. The clumps are likely forming stars in a starbursting mode and have a young stellar population (~10 Myr). The properties of the Lyman-α (Lyα) emission and nebular far-ultraviolet absorption lines indicate the presence of ejected material with global outflowing velocities of ~200-300 km s-1. Assuming that the detected outflows are the consequence of star formation feedback, we infer an average mass loading factor (η) for the clumps of ~1.8-2.4 consistent with results obtained from hydrodynamical simulations of clumpy galaxies that assume relatively strong stellar feedback. Assuming no gas inflows (semiclosed box model), the estimates of η suggest that the time-scale over which the outflows expel the molecular gas reservoir (≃7 × 108 M) of the four detected low-mass clumps is ≲50 Myr.

Dates and versions

insu-03711487 , version 1 (01-07-2022)

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Cite

E. Iani, A. Zanella, J. Vernet, J. Richard, M. Gronke, et al.. Stellar feedback in a clumpy galaxy at z 3.4. Monthly Notices of the Royal Astronomical Society, 2021, 507, pp.3830-3848. ⟨10.1093/mnras/stab2376⟩. ⟨insu-03711487⟩
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