TY - JOUR

T1 - Stellar feedback in a clumpy galaxy at z similar to 3.4

AU - Iani, E.

AU - Zanella, A.

AU - Vernet, J.

AU - Richard, J.

AU - Gronke, M.

AU - Harrison, C. M.

AU - Arrigoni-Battaia, F.

AU - Rodighiero, G.

AU - Burkert, A.

AU - Behrendt, M.

AU - Chen, Chian-Chou

AU - Emsellem, E.

AU - Fensch, J.

AU - Hibon, P.

AU - Hilker, M.

AU - Le Floc'h, E.

AU - Mainieri, V.

AU - Swinbank, A. M.

AU - Valentino, F.

AU - Vanzella, E.

AU - Zwaan, M. A.

PY - 2021/9/23

Y1 - 2021/9/23

N2 - Giant star-forming regions (clumps) are widespread features of galaxies at z approximate to 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 similar or equal to 3.4 lensed by the foreground galaxy cluster Abell 2895. Four compact clumps with sizes less than or similar to 280 pc and representative of the low-mass end of clumps' mass distribution (stellar masses less than or similar to 2 x 10(8) M-circle dot) dominate the galaxy morphology. The clumps are likely forming stars in a starbursting mode and have a young stellar population (similar to 10 Myr). The properties of the Lyman-alpha (Ly alpha) emission and nebular far-ultraviolet absorption lines indicate the presence of ejected material with global outflowing velocities of similar to 200-300 km s(-1). Assuming that the detected outflows are the consequence of star formation feedback, we infer an average mass loading factor (eta) for the clumps of similar to 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 n suggest that the time-scale over which the outflows expel the molecular gas reservoir (similar or equal to 7 x 10(8 )M(circle dot)) of the four detected low-mass clumps is less than or similar to 50 Myr.

AB - Giant star-forming regions (clumps) are widespread features of galaxies at z approximate to 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 similar or equal to 3.4 lensed by the foreground galaxy cluster Abell 2895. Four compact clumps with sizes less than or similar to 280 pc and representative of the low-mass end of clumps' mass distribution (stellar masses less than or similar to 2 x 10(8) M-circle dot) dominate the galaxy morphology. The clumps are likely forming stars in a starbursting mode and have a young stellar population (similar to 10 Myr). The properties of the Lyman-alpha (Ly alpha) emission and nebular far-ultraviolet absorption lines indicate the presence of ejected material with global outflowing velocities of similar to 200-300 km s(-1). Assuming that the detected outflows are the consequence of star formation feedback, we infer an average mass loading factor (eta) for the clumps of similar to 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 n suggest that the time-scale over which the outflows expel the molecular gas reservoir (similar or equal to 7 x 10(8 )M(circle dot)) of the four detected low-mass clumps is less than or similar to 50 Myr.

KW - galaxies: evolution

KW - galaxies: high-redshift

KW - galaxies: irregular

KW - galaxies: ISM

KW - galaxies: star formation

KW - STAR-FORMING CLUMPS

KW - LY-ALPHA RADIATION

KW - GRAVITATIONALLY LENSED GALAXIES

KW - INTEGRAL FIELD SPECTROSCOPY

KW - RESONANCE-LINE RADIATION

KW - MOLECULAR GAS FRACTIONS

KW - LYMAN-BREAK GALAXY

KW - ULTRA DEEP FIELD

KW - HIGH-REDSHIFT

KW - GIANT CLUMPS

U2 - 10.1093/mnras/stab2376

DO - 10.1093/mnras/stab2376

M3 - Journal article

VL - 507

SP - 3830

EP - 3848

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 3

ER -