COSMOS J100043.15+020637.2 is a merger remnant at z = 0.36 with two optical nuclei , NW and SE , offset by 500 mas ( 2.5 kpc ) .
Prior studies suggest two competing scenarios for these nuclei : ( 1 ) SE is an active galactic nucleus ( AGN ) lost from NW due to a gravitational-wave recoil .
( 2 ) NW and SE each contain an AGN , signaling a gravitational-slingshot recoil or inspiralling AGNs .
We present new images from the Very Large Array ( VLA ) at a frequency \nu = 9.0 GHz and a FWHM resolution \theta = 320 mas ( 1.6 kpc ) , and the Very Long Baseline Array ( VLBA ) at \nu = 1.52 GHz and \theta = 15 mas ( 75 pc ) .
The VLA imaging is sensitive to emission driven by AGNs and/or star formation , while the VLBA imaging is sensitive only to AGN-driven emission .
No radio emission is detected at these frequencies .
Folding in prior results , we find : ( a ) The properties of SE and its adjacent X-ray feature resemble those of the unobscured AGN in NGC 4151 , albeit with a much higher narrow emission-line luminosity .
( b ) The properties of NW are consistent with it hosting a Compton-thick AGN that warms ambient dust , photoionizes narrow emission-line gas and is free-free absorbed by that gas .
Finding ( a ) is consistent with scenarios ( 1 ) and ( 2 ) .
Finding ( b ) weakens the case for scenario ( 1 ) and strengthens the case for scenario ( 2 ) .
Follow-up observations are suggested .