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Radio sources with peaked spectra (peaked spectrum sources, PSS) and compactsymmetric objects (CSO) are powerful, compact, and presumably young AGNs andtherefore particularly suitable to study aspects of the AGN-host connection. Weuse a statistical approach to compare a PSS-CSO sample with a matchingcomparison sample of extended sources (ECS). We find significant differencesbetween the two samples. In particular, we find that the ECS sample has ahigher proportion of passive galaxies with a lower star formation activity.This applies to both sub-samples of QSOs or radio galaxies as well as to theentire sample. The star formation rates of the PSS-CSO host galaxies aretypically in the range 0 to 5 M_sun/yr and the stellar masses are in the range3x10^11 to 10^12 M_sun. Secondly, in agreement with previous results, we find aremarkably high proportion of PSS-CSO host galaxies with merger signatures. Themerger fraction of the PSS-CSO sample is 0.61, which is significantly higherthan that of the comparison sample (0.15). We suggest that this difference canbe explained by assuming that the majority of the PSSs and CSOs cannot evolveto extended radio sources and are therefore not represented in our comparisonsample.

A comparison of compact, presumably young with extended, evolved radio active galactic nuclei