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We report the first detection of multiphase gas within a quiescent galaxybeyond $z\approx0$. The observations use the brighter image of doubly lensedQSO HE 0047$-$1756 to probe the ISM of the massive ($M_{\rm star}\approx10^{11} \mathrm{M_\odot}$) elliptical lens galaxy at $z_\mathrm{gal}=0.408$.Using Hubble Space Telescope's Cosmic Origins Spectrograph (COS), we obtain amedium-resolution FUV spectrum of the lensed QSO and identify numerousabsorption features from $\mathrm{H_2}$ in the lens ISM at projected distance$d=4.6$ kpc. The $\mathrm{H_2}$ column density is $\logN(\mathrm{H_2})/\mathrm{cm^{-2}}=17.8^{+0.1}_{-0.3}$ with a molecular gasfraction of $f_\mathrm{H_2}=2-5\%$, roughly consistent with some localquiescent galaxies. The new COS spectrum also reveals kinematically complexabsorption features from highly ionized species O VI and N V with columndensities log $N(\mathrm{O VI})/\mathrm{cm^{-2}} =15.2\pm0.1$ and log$N(\mathrm{N V})/\mathrm{cm^{-2}} =14.6\pm0.1$, among the highest known inexternal galaxies. Assuming the high-ionization absorption features originatein a transient warm ($T\sim10^5\,$K) phase undergoing radiative cooling from ahot halo surrounding the galaxy, we infer a mass accretion rate of $\sim0.5-1.5\,\mathrm{M_\odot\,yr^{-1}}$. The lack of star formation in the lenssuggests the bulk of this flow is returned to the hot halo, implying a heatingrate of $\sim10^{48}\,\mathrm{erg\,yr^{-1}}$. Continuous heating from evolvedstellar populations (primarily SNe Ia but also winds from AGB stars) maysuffice to prevent a large accumulation of cold gas in the ISM, even in theabsence of strong feedback from an active nucleus.

Evidence for Late-Time Feedback from the Discovery of Multiphase Gas in a Massive Elliptical at $z=0.4$