Supermassive Black Hole Discovery

In another big science news story from the past few days, astronomers have found evidence of a supermassive black hole that appears to be much larger than is expected from theoretical models. The black hole in question lies at the center of a distant galaxy and is also quite old (9 billion years). There is a related arXiv paper here. This is well outside my field of expertise, but it looks like the idea is that this might be the first discovered in a new class of this sort of galaxy.