Figure 3
Merging Black Holes in Abell 400
Scientists are watching two supermassive black holes spiral towards each other near the centre of a galaxy cluster named Abell 400. Shown in this X-ray/radio composite image are the multi-million degree radio jets emanating from the black holes (image credit: X-ray: NASA/CXC/AIfA/D Hudson & T Reiprich et al.; Radio: NRAO/VLA/NRL).