Some black holes are anything but black – and we've found more than 75,000 of the brightest ones

, which travels millions of kilometers through space and can be seen by radio telescopes. Others produce"winds" at the center of the galaxy, capable of pushing any gas out of the galaxy.With such destructive forces in the middle of a galaxy, astronomers are certain this must have a big impact on the galaxy itself. We know most galaxies are slowly AGN can therefore not only help us to better understand elusive black holes, but studying them also teaches us about galaxies themselves.

Because of this, it was thought they were all different objects, but by looking at the same objects with different telescopes astronomers discovered they had many similarities, and realised the benefits of using more of the electromagnetic spectrum to find them. The relative brightness of a galaxy across different parts of the electromagnetic spectrum is called its “spectral energy distribution”. This can be used to measure how many stars are in a galaxy, how old they are, what they’re made of, and how much dust is blocking the light.In our research, in Monthly Notices of the Royal Astronomical Society, we show that this technique can also be used to spot AGN.

It’s not a simple thing to do. The difference between starlight and the light from an AGN is incredibly subtle, so it’s possible to confuse young stars for a bright black hole, and vice versa.

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