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We present a low-redshift (z=0.029) Damped Lyman-alpha (DLA) system in thespectrum of a background Quasi-Stellar Object (QSO). The DLA is associated withan interacting galaxy pair within a galaxy group. We detected weak Lyman-alphaemission centered at the absorption trough of the DLA. The emission was likelytracing the neutral HI reservoir around the galaxies in the interacting pair,which scattered the Lyman-alpha generated by star formation within thosegalaxies. We also found that the interacting pair is enveloped by a large HIcloud with $M(HI)=2\times 10^{10}M_{\odot}$. We discovered blueshifted 21cm HIemission, corresponding to M(HI)=$ 2\times10^{9}~M_{\odot}$, associated withJ151225.15+012950.4 - one of the galaxies in the interacting pair. Theblueshifted HI was tracing gas flowing into the galaxy from behind and towardsus. Gas at similar blueshifted velocities was seen in the QSO sightline thussuggesting the presence of a filamentary structure of the order of 100kpcfeeding the galaxy. We estimated a mass inflow rate of $2 M_{\odot}~yr^{-1}$into the galaxy, which matches the star formation rate estimated from H-alphaemission. It is likely that the inflow of enormous amounts of gas has triggeredstar formation in this galaxy. The sudden acquisition of cold gas may lead to astarburst in this galaxy like those commonly seen in simulations.

Discovery of a Damped Ly-alpha System in a Low-z Galaxy Group: Possible Evidence for Gas Inflow and Nuclear Star Formation