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We present new observations acquired with the Multi Unit SpectroscopicExplorer instrument on the Very Large Telescope in a quasar field that hosts ahigh column-density damped Ly{\alpha} absorber (DLA) at z~3.25. We detectLy{\alpha} emission from a nebula at the redshift of the DLA with lineluminosity (27+/-1)x1e41 erg/s, which extends over 37+/-1 kpc above a surfacebrightness limit of 6x1e-19 erg/s/cm2/arcsec2 at a projected distance of30.5+/-0.5 kpc from the quasar sightline. Two clumps lie inside this nebula,both with Ly{\alpha} rest-frame equivalent width > 50 A and with relativeline-of-sight velocities aligned with two main absorption components seen inthe DLA spectrum. In addition, we identify a compact galaxy at a projecteddistance of 19.1+/-0.5 kpc from the quasar sightline. The galaxy spectrum isnoisy but consistent with that of a star-forming galaxy at the DLA redshift. Weargue that the Ly{\alpha} nebula is ionized by radiation from star formationinside the two clumps, or by radiation from the compact galaxy. In either case,these data imply the presence of a structure with size >>50 kpc inside whichgalaxies are assembling, a picture consistent with galaxy formation in groupsand filaments as predicted by cosmological simulations such as the EAGLEsimulations.

Witnessing galaxy assembly in an extended z~3 structure