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We searched for star formation activity associated with high-z DampedLyman-alpha systems (DLAs) with Subaru telescope. We used a set of narrow-band(NB) filters whose central wavelengths correspond to the redshifted Lyman-alphaemission lines of targeted DLA absorbers at 3<z<4.5. We detected one apparentNB-excess object located 3.80 arcsec (~28kpc) away from the quasar SDSSJ031036.84+005521.7. Follow-up spectroscopy revealed an asymmetric Lyman-alphaemission at z_em=3.115+/-0.003, which perfectly matches the sub-DLA trough atz_abs=3.1150 with logN(HI)/cm^-2=20.05. The Lyman-alpha luminosity is estimatedto be L(LyA)=1.07x10^42 erg s^-1, which corresponds to a star formation rate of0.97 M_\odot yr^-1. Interestingly, the detected Lyman-alpha emission isspatially extended with a sharp peak. The large extent of the Lyman-alphaemission is remarkably one-sided toward the quasar line-of-sight, and isredshifted. The observed spatially asymmetric surface brightness profile can bequalitatively explained by a model of a DLA host galaxy, assuming a galacticoutflow and a clumpy distribution of HI clouds in the circumgalactic medium.This large Lyman-alpha extension, which is similar to those found in Rauch etal. (2008), could be the result of complicated anisotropic radiative transferthrough the surrounding neutral gas embedded in the DLA.

Extended Lyman-alpha emission from a high-z DLA at z=3.115