The Interstellar Medium of Quiescent Galaxies and its Evolution With Time

Understand

We characterise the basic far-IR (FIR) properties and the gas mass fraction of massive (<log(M*/Msun)> ~ 11.0) quiescent galaxies (QGs) and explore how these evolve from z = 2.0 to the present day.

• We use robust, multi-wavelength (mid- to far-IR and sub-millimetre to radio) stacking ensembles of homogeneously selected and mass complete samples of log(M*/Msun) > 10.8 QGs.
• We find that the dust to stellar mass ratio (Md/M*) rises steeply as a function of redshift up to z~1.0 and then remains flat at least out to z = 2.0.
• Using Md as a proxy of gas mass (Mgas), we find a similar trend for the evolution of the gas mass fraction (fgas) with z > 1.0 QGs having fgas ~ 7.0% (for solar metallicity).