Often in these blog posts we talk about two things. At one end of the spectrum, there are supermassive black holes that exist in the centre of galaxies (106 – 1010 M⊙). And at the other, stellar mass black holes (∼ 10 M⊙), which are the endpoints of the evolution of the most massive stars and can be found orbiting another star, forming a black hole X-ray binary (BHXB). But what about the poor forgotten black holes with masses between these two classes? After all, it makes sense to think that, at some point in cosmic time, black holes between 10 and 106 M⊙ had to exist, in order to…
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