Stellar feedback in a clumpy galaxy at z ∼3.4

E. Iani*, A. Zanella, J. Vernet, J. Richard, M. Gronke, C. M. Harrison, F. Arrigoni-Battaia, G. Rodighiero, A. Burkert, M. Behrendt, Chian Chou Chen, E. Emsellem, J. Fensch, P. Hibon, M. Hilker, E. Le Floc'H, V. Mainieri, A. M. Swinbank, F. Valentino, E. VanzellaM. A. Zwaan

*Corresponding author voor dit werk

OnderzoeksoutputAcademicpeer review

9 Citaten (Scopus)
101 Downloads (Pure)

Samenvatting

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.

Originele taal-2English
Pagina's (van-tot)3830-3848
Aantal pagina's19
TijdschriftMonthly Notices of the Royal Astronomical Society
Volume507
Nummer van het tijdschrift3
DOI's
StatusPublished - 1-nov.-2021

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