Speaker
Description
We investigate the environmental properties of radio-active AGN in a two-folded way. On the one hand we analyse the clustering properties of radio-selected AGN from the VLA-COSMOS survey, finding that they inhabit group-to-cluster like structures with halo masses M>~10^13.6 Msun, independent of both redshift and radio luminosity, at least up to z~2.5-3. Moreover, comparisons between the observed space density of radio-selected AGN and that of dark matter halos indicates that the radio-active phase should be a recurrent phenomenon. As a second step, we investigate the occurrence of radio-selected AGN within cosmological environments such as filaments, clusters or the field up to z~1.2. In agreement with previous results obtained in the local universe, we find that ~20% of radio-selected AGN reside in clusters. We also observe a marked
preference for more radio-luminous AGN to be found in over-dense structures with respect to fainter sources (~38% vs ~15%), as we find a strong dependence of the environmental properties of radio-active AGN on the stellar mass of their hosts.
Our results suggests a scenario whereby physical processes at sub-pc and Kpc scales are strongly interconnected with the large-scale structure properties of the AGN itself.
| Affiliation | IAPS-INAF |
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