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We report the first detection of the host galaxy of a strong 2175 \AA$ $ dustabsorber at z = 2.12 towards the background quasar SDSS J121143.42+083349.7using HST/WFC3 IR F140W direct imaging and G141 grism spectroscopy. Thespectroscopically confirmed host galaxy is located at a small impact parameterof ~ 5.5 kpc (~ 0.65$''$). The F140W image reveals a disk-like morphology withan effective radius of 2.24 $\pm$ 0.08 kpc. The extracted 1D spectrum isdominated by a continuum with weak emission lines ([O\III] and [O\II]). The[O\III]-based unobscured star formation rate (SFR) is 9.4 $\pm$ 2.6M$_{\odot}$yr$^{-1}$ assuming an [O\III]/H$\alpha$ ratio of 1. The moderate4000 \AA$ $ break (Dn(4000) index $\sim$ 1.3) and Balmer absorption linesindicate that the host galaxy contains an evolved stellar population with anestimated stellar mass M$_*$ of (3 - 7) $\times$ 10$^{10}$ M$_{\odot}$. The SFRand M$_*$ of the host galaxy are comparable to, though slightly lower than,those of typical emission-selected galaxies at $z$ $\sim$ 2. As inferred fromour absorption analysis in Ma et al. (2015, 2017, 2018), the host galaxy isconfirmed to be a chemically-enriched, evolved, massive, and star-formingdisk-like galaxy that is likely in the transition from a blue star-forminggalaxy to a red quiescent galaxy.

Revealing the host galaxy of a quasar 2175 \AA$ $ dust absorber at z = 2.12