Landing page for project EH047

We have discovered a potential triple-AGN system in the centre of the massive z = 0.83 galaxy cluster ACT-CL J1407.0+1048 (J1407). Optical imaging from the Hubble Space Telescope (HST) shows that the central galaxy of J1407 is a "mess" resulting from a spectacular collision of multiple galaxies. At the centre of the "mess", we see three blue compact sources, with separation < 0.7 arcsec (approx. 5 kpc at the cluster redshift) in the HST image. These are coincident with an approx. 10 mJy unresolved radio source detected in VLASS and FIRST. We request EVN+eMERLIN observations to test if this object is resolved into multiple components when imaged at milliarcsecond resolution, and confirm whether or not it is in fact a rare triple-AGN system.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197