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They also look at the colors of the host galaxies based on WISE data. THe majority of objects have $[4.6]-[12]$ and $[3.4]-[4.6]$ colors consistent with either QSOs or stars/ellipticals. There are very few galaxies with the intermediate $[4.6]-[12]$ colors associated with spirals \citep{Jarrett_2011}.   Note that WISE is not sensitive to elliptical galaxies at high (\textit{how much?}) redshifts since they have little dust or gas. High-$z$ galaxies will be either luminous AGN or starbursts. \citet{Brown_2014} examine galaxy SEDs from ultraviolet to mid-infrared, including WISE. He thinks the radio sources in red elliptical galaxies is due to star formation. Therefore, the critical question is whether our ``dusty ellipticals'' are double or more (agn) radio sources, or star formation limited to the size of the galaxies.   \citet{Brown_2011} also look at the continuum emission from early-type galaxies. The median radio power is proportional to K-band luminosity to the power $\alpha=2.78\pm0.16$. It is thus highly likely that the most massive galaxies always host an active galactic nucleus or have recently undergone star formation.  Brown's galaxies are optically selected and low redshift. So the ``dusty elliptical'' regime are probably a different population than ours. He says that examination of morphology (I don't know whether this is reflected in paper) suggests that these are disk galaxies with what he calls ``pseudo-bulges''.   It could be that this is all a continuum of properties. Perhaps merging system systems where there is various levels of dominance of the disk and bulge components?  Brown has quite a bit of expertise that might be useful for us. As we proceed with the color paper, we might want to think of bringing him in -- just something to keep in mind as a possibility.  \citet{Kalfountzou_2014} look at infrared colors of radio hosts, including Herschel. These results suggest that powerful radio jets are associated with star formation, especially at lower accretion rates.