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We present new observations of MRG-M2129, a quiescent galaxy at z = 2.15 withthe Atacama Large Millimeter/submillimeter Array (ALMA). With the combinationof the gravitational lensing effect by the foreground cluster and the angularresolution provided by ALMA, our data reveal 1.2 mm continuum emission at$\sim130$ pc angular resolution. Compact dust continuum is detected at 7.9$\sigma$ in the target but displaced from its stellar peak position by $62 \pm38$ mas, or $\sim169 \pm 105$ pc in the source plane. We find considerably highdust-to-stellar mass ratio, $4 \times 10^{-4}$. From non-detection of the [C i]3P2 -> 3P1 line, we then derive $3 \sigma$ upper limits on the moleculargas-to-dust mass ratio $\delta_\mathrm{GDR} < 60$ and the moleculargas-to-stellar mass ratio fH2 < 2.3%. The derived $\delta_\mathrm{GDR}$ is$>2\times$ smaller than the typical value assumed for quiescent galaxies in theliterature. Our study supports that there exists a broad range of$\delta_\mathrm{GDR}$ and urges submillimeter follow-up observations ofquenching/recently quenched galaxies at similar redshifts. Based on the derivedlow $\delta_\mathrm{GDR}$ and other observed dust properties, we argue that thecentral black hole is still active and regulates star formation in the system.Our study exhibits a rare case of a gravitationally lensed type 2 QSO harboredby a quiescent galaxy.

Compact dust emission in a gravitationally lensed massive quiescent galaxy at z = 2.15 revealed in ~130 pc-resolution observations by ALMA