The observed profile best fits models with 2-3 black holes. Credit: Torniamenti, et al
One of the things the team compared is what is known as a half-mass radius. That is the radius within which half the cluster’s mass is contained. With the presence of some black holes, the cluster should be slightly more dense, and thus the half-mass radius should be smaller. Another aspect is the central density, which should spike a bit if black holes are present.
So while it’s quite possible that the Hyades contains a stellar mass black hole, it will take more observations to be sure. Only then will we truly know whether there is a monster lurking in our midst.
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