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This paper reports the discovery of spatially-extended line-emitting nebula,reaching to ~100 physical kpc (pkpc) from a damped Ly{\alpha} absorber (DLA) atz_DLA=0.313 along the sightline toward QSO PKS1127-145 (z_QSO=1.188). This DLAwas known to be associated with a galaxy group of dynamical mass M_group ~3e12M_sun, but its physical origin remained ambiguous. New wide-field integralfield observations revealed a giant nebula detected in [OII], H{\beta}, [OIII],H{\alpha}, and [NII] emission, with the line-emitting gas following closely themotions of group galaxies. One of the denser streams passes directly in frontof the QSO with kinematics consistent with the absorption profiles recorded inthe QSO echelle spectra. The emission morphology, kinematics, and line ratiosof the nebula suggest that shocks and turbulent mixing layers, produced as aresult of stripped gaseous streams moving at supersonic speed across theambient hot medium, contribute significantly to the ionization of the gas.While the DLA may not be associated with any specific detected member of thegroup, both the kinematic and dust properties are consistent with the DLAoriginating in streams of gas stripped from sub-L* group members at <~25 pkpcfrom the QSO sightline. This study demonstrates that gas stripping in low-massgalaxy groups is effective in releasing metal-enriched gas from star-formingregions, producing absorption systems in QSO spectra, and that combiningabsorption and emission-line observations provides an exciting new opportunityfor studying gas and galaxy co-evolution.

A Giant Intragroup Nebula Hosting a Damped Lya Absorber at z=0.313