UDGs are Ultra Diffuse Galaxies in the vacuum polarized center of Galaxy Clusters. (Q-FFF Model).
Below: a Triple Galaxy Cluster polarizing the vacuum in the center.with UDG creation.
A White Hole is a diluted vacuum area by the Axion vacuum polarization between dark matter black holes.
The Largest Radio Galaxy recently found by Martijn Oei, (Leiden uni)
seems to represent a monster Herbig Haro dual black hole system , with black hole hotspots : the so called 1e GABHs(Galaxy Anchor Black Holes.) at both ends.
The Galaxy is measured 16 million lightyear long.