Star formation in the massive cluster merger Abell 2744
T.D. Rawle (1), B. Altieri (1), E. Egami (2), P.G. Perez-Gonzalez (3),, J. Richard (4), J.S. Santos (5,1), I. Valtchanov (1), G. Walth (2), H. Bouy, (6), C.P. Haines (7), N. Okabe (8) ((1) ESAC, ESA, (2) University of Arizona,, (3) Universidad Complutense de Madrid

TL;DR
This study investigates star-forming galaxies in the merging galaxy cluster Abell 2744 using UV and IR imaging, revealing the total and obscured star formation rates, and linking star formation activity to the cluster merger dynamics.
Contribution
It provides the first comprehensive measurement of star formation rates in A2744, highlighting the impact of merger shocks on galaxy evolution and star formation activity.
Findings
Total SFR in A2744 is approximately 343 Msun/yr.
Obscured star formation dominates the core region with IR SFR of 138 Msun/yr.
Presence of jellyfish galaxies indicates merger-triggered stripping and star formation.
Abstract
We present a comprehensive study of star-forming (SF) galaxies in the HST Frontier Field recent cluster merger A2744 (z=0.308). Wide-field, ultraviolet-infrared (UV-IR) imaging enables a direct constraint of the total star formation rate (SFR) for 53 cluster galaxies, with SFR{UV+IR}=343+/-10 Msun/yr. Within the central 4 arcmin (1.1 Mpc) radius, the integrated SFR is complete, yielding a total SFR{UV+IR}=201+/-9 Msun/yr. Focussing on obscured star formation, this core region exhibits a total SFR{IR}=138+/-8 Msun/yr, a mass-normalised SFR{IR} of Sigma{SFR}=11.2+/-0.7 Msun/yr per 10^14 Msun and a fraction of IR-detected SF galaxies f{SF}=0.080(+0.010,-0.037). Overall, the cluster population at z~0.3 exhibits significant intrinsic scatter in IR properties (total SFR{IR}, Tdust distribution) apparently unrelated to the dynamical state: A2744 is noticeably different to the merging Bullet…
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