Description
Radio outflows of active galactic nuclei (AGNs) are invoked in cosmological models as a key feedback mechanism in the latest phases of massive galaxy formation. Recently, it has been suggested that the two major radio AGN populations-the powerful high-excitation, and the weak low-excitation radio AGNs (HERAGN and LERAGN, respectively)-represent two earlier and later stages of massive galaxy buildup. To test this, here we make use of a local (0.04<z<0.1) sample of ~500 radio AGNs with available optical spectroscopy, drawn from the FIRST, NVSS, SDSS, and 3CRR surveys.
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