@article{2dc4676474f54e98867d932bef1c6017,
title = "Stellar feedback in a clumpy galaxy at z ∼3.4",
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{\texttrademark}) of the four detected low-mass clumps is 50 Myr.",
keywords = "galaxies: evolution, galaxies: high-redshift, galaxies: irregular, galaxies: ISM, galaxies: star formation",
author = "E. Iani and A. Zanella and J. Vernet and J. Richard and M. Gronke and Harrison, {C. M.} and F. Arrigoni-Battaia and G. Rodighiero and A. Burkert and M. Behrendt and Chen, {Chian Chou} and E. Emsellem and J. Fensch and P. Hibon and M. Hilker and {Le Floc'H}, E. and V. Mainieri and Swinbank, {A. M.} and F. Valentino and E. Vanzella and Zwaan, {M. A.}",
note = "Funding Information: The work presented in this manuscript is based on observations collected at the European Southern Observatory under the ESO programmes 087.B-0875(A), 60.A-9195(A) and 0102.B-0741(A). It is also based on observations made with the NASA/ESA Hubble Space Telescope, and obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA). The authors thank the anonymous referee for the detailed revision of the manuscript and useful comments. We want to thank Francesca Rizzo, Thierry Fusco and C. De Breuck for the helpful discussions regarding the work presented in this paper. MG was supported by NASA through the NASA Hubble Fellowship grant HST-HF2-51409 and acknowledges support from HST grants HST-GO-15643.017-A, HST-AR-15039.003-A, and XSEDE grant TG-AST180036. EV acknowledges funding from the INAF for 'Interventi aggiuntivi a sostegno della ricerca di main-stream'. FV acknowledges support from the Carlsberg Foundation Research Grant CF18-0388 'Galaxies: Rise and Death'. CCC acknowledges support from the Ministry of Science and Technology of Taiwan (MOST 109-2112-M-001-016-MY3). Publisher Copyright: {\textcopyright} 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",
year = "2021",
month = nov,
day = "1",
doi = "10.1093/mnras/stab2376",
language = "English",
volume = "507",
pages = "3830--3848",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",
}