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The quasar Q0918+1636 (z=3.07) has two intervening high-metallicity DampedLyman-alpha Absorbers (DLAs) along the line of sight, at redshifts of z=2.412and 2.583. The z=2.583 DLA is located at a large impact parameter of 16.2 kpc,and despite this large impact parameter it has a very high metallicity(consistent with solar), a substantial fraction of H_2 molecules, and it isdusty as inferred from the reddened spectrum of the background QSO. The z=2.412DLA has a metallicity of [M/H]=-0.6 (based on ZnII and SiII). In this paper wepresent new observations of this interesting sightline. HST/WFC3 imaging wasobtained in the F606W, F105W and F160W bands. This is complemented byground-based imaging in the u-, g-bands as well as K_s observations in thenear-infrared (NIR). In addition, we present further spectroscopy with theESO/VLT X-Shooter spectrograph. Based on these observations we obtain thefollowing results: By fitting stellar population synthesis models to thephotometric SED we constrain the physical properties of the z=2.583 DLA galaxy,and we infer its morphology by fitting a Sersic model to its surface brightnessprofile. We find it to be a relatively massive (M_star 10^10 M_sun), stronglystar-forming (SFR~30 M_sun / yr, dusty (E_(B-V)=0.4) galaxy with a disk-likemorphology. We detect most of the strong emission lines from the z=2.583 DLA[OIII],3727, [OIII],4960, [OIII],5007, Hbeta, and Halpha, albeit at lowsignal-to-noise (SN) ratio except for the [OIII],5007 line. We also detect[OIII],5007 emission from the galaxy counterpart of the z=2.412 DLA at a smallimpact parameter (<2 kpc). Overall our findings are consistent with theemerging picture that high-metallicity DLAs are associated with relatively(compared to typical DLAs) luminous and massive galaxy counterparts.

The Galaxy Counterparts of the two high-metallicity DLAs at z=2.412 and z=2.583 towards Q0918+1636