Which came first - the black hole or the galaxy? Many large galaxies in the Universe have a supermassive black hole at their centre. But which came first? The black hole that is frantically consuming the matter around it or the vast galaxy that is its home?
A European team led by David Elbaz from CEA-IRFU's Astrophysics Department has just discovered a spectacular interaction between a quasar and a galaxy from observations made with the VISIR camera.