We present the clustering properties of a complete sample of 968 radio sources detected at 1.4 GHz by the VLA-COSMOS survey with radio fluxes brighter than 0.15 mJy .
92 % have redshift determinations from the Laigle et al .
( 2016 ) catalogue .
Based on their radio-luminosity , these objects have been divided into 644 AGN and 247 star-forming galaxies .
By fixing the slope of the auto-correlation function to \gamma = 2 , we find r _ { 0 } = 11.7 ^ { +1.0 } _ { -1.1 } Mpc for the clustering length of the whole sample , while r _ { 0 } = 11.2 ^ { +2.5 } _ { -3.3 } Mpc and r _ { 0 } = 7.8 ^ { +1.6 } _ { -2.1 } Mpc ( r _ { 0 } = 6.8 ^ { +1.4 } _ { -1.8 } Mpc for z \leq 0.9 ) are respectively obtained for AGN and star-forming galaxies .
These values correspond to minimum masses for dark matter haloes of M _ { min } = 10 ^ { 13.6 ^ { +0.3 } _ { -0.6 } } M _ { \odot } for radio-selected AGN and M _ { min } = 10 ^ { 13.1 ^ { +0.4 } _ { -1.6 } } M _ { \odot } for radio-emitting star-forming galaxies ( M _ { min } = 10 ^ { 12.7 ^ { +0.7 } _ { -2.2 } } M _ { \odot } for z \leq 0.9 ) .
Comparisons with previous works imply an independence of the clustering properties of the AGN population with respect to both radio luminosity and redshift .
We also investigate the relationship between dark and luminous matter in both populations .
We obtain \langle M _ { * } \rangle / M _ { halo } \mathrel { \hbox to 0.0 pt { \lower 3.0 pt \hbox { $% \sim$ } } \raise 2.0 pt \hbox { $ < $ } } 10 ^ { -2.7 } for AGN , and \langle M _ { * } \rangle / M _ { halo } \mathrel { \hbox to 0.0 pt { \lower 3.0 pt \hbox { $% \sim$ } } \raise 2.0 pt \hbox { $ < $ } } 10 ^ { -2.4 } in the case of star-forming galaxies .
Furthermore , if we restrict to z \mathrel { \hbox to 0.0 pt { \lower 3.0 pt \hbox { $ \sim$ } } \raise 2.0 pt \hbox { $ < $ } } 0.9 star-forming galaxies , we derive \langle M _ { * } \rangle / M _ { halo } \mathrel { \hbox to 0.0 pt { \lower 3.0 pt \hbox { $% \sim$ } } \raise 2.0 pt \hbox { $ < $ } } 10 ^ { -2.1 } , result which clearly shows the cosmic process of stellar build-up as one moves towards the more local universe .
Comparisons between the observed space density of radio-selected AGN and that of dark matter haloes shows that about one in two haloes is associated with a black hole in its radio-active phase .
This suggests that the radio-active phase is a recurrent phenomenon .