The stellar, molecular gas and dust content of the host galaxies of two z~2.8 dust obscured quasars

TL;DR

This study investigates the stellar, molecular gas, and dust content of two high-redshift dust-obscured quasars, revealing they are mature systems with relatively low molecular gas and dust compared to similar galaxies.

Contribution

It provides new observational constraints on the molecular gas and dust content of z~2.8 dust-obscured quasars, highlighting their mature evolutionary stage.

Findings

Molecular gas masses are less than ~10^10 solar masses.

High stellar masses (~10^11-12 solar masses) inferred from near-infrared data.

Low dust masses consistent with mature galaxy systems.

Abstract

We present optical through radio observations of the host galaxies of two dust obscured, luminous quasars selected in the mid-infrared, at z=2.62 and z=2.99, including a search for CO emission. Our limits on the CO luminosities are consistent with these objects having masses of molecular gas <~10^10 solar masses, several times less than those of luminous submillimeter-detected galaxies (SMGs) at comparable redshifts. Their near-infrared spectral energy distributions, however, imply that these galaxies have high stellar masses (~10^11-12 solar masses). The relatively small reservoirs of molecular gas and low dust masses are consistent with them being relatively mature systems at high-z.