z-GAL dust continuum properties

The robustness of the SED sampling for the z-GAL sources is highlighted by the mock analysis that showed high accuracy in estimating the continuum dust properties. These findings provided the basis for our detailed analysis of the z-GAL continuum data. We report a range of dust emissivities with {beta}~1.5-3 estimated up to high precision with relative uncertainties that vary in the range 7%-15%, and an average of 2.2+/-0.3.

We find dust temperatures varying from 20 to 50K with an average of T_dust_~30K for the optically thin case and T_dust_~38K in the optically thick case. For all the sources, we estimate the dust masses and apparent infrared luminosities (based on the optically thin approach). An inverse correlation is found between T_dust_ and {beta} with {beta}{prop.to}T^-0.69^_dust_, which is similar to what is seen in the local Universe.

Finally, we report an increasing trend in the dust temperature as a function of redshift at a rate of 6.5+/-0.5K/z for this 500um-selected sample. Based on this study, future prospects are outlined to further explore the evolution of dust temperature across cosmic time.