Flipping a fair coin to decipher the large-scale environment of radio galaxies

The role played by the large-scale environment in the nuclear activity of radio galaxies  is still not completely understood. Accretion mode, jet power, and galaxy evolution are connected with their large-scale environment on scales from tens to hundreds of kiloparsecs. I am presenting a detailed statistical analysis of the large-scale environment for two samples of radio galaxies in the local Universe (i.e., up to redshift 0.15).
I will discuss on a direct search of galaxy-rich environments around radio galaxies by using them as beacons. To carry out this study a new method, that does not appear to suffer cosmological biases and artifacts, as other algorithms, was developed. I conclude that, despite their radio morphological classification (FRI versus FRII) and/or their optical classification (high- or low-excitation radio galaxy, i.e., HERG or LERG), radio galaxies in the local universe tend to live in galaxy-rich large-scale environments that have similar characteristics and richness. I will then show that properties of large-scale environments of both FRIs and FRIIs do not depend by the property of central radio galaxy. Finally, I will provide an estimate of the X-ray parameters that can be derived from optical observations to plan future follow up campaigns.