In fact that article states that the upper limit for the size of a central black hole in the Triangulum galaxy is estimated at 3000 solar masses, so it simply w

In fact that article states that the upper limit for the size of a central black hole in the Triangulum galaxy is estimated at 3000 solar masses, so it simply wouldn't be "supermassive" - but there is not a claim that no black hole exists there. noetic_techy: > what if the key to dark matter is some unknown property of the central black hole [...] ? cowboysauce: > Well, then you encounter problems with things like the triangulum Galaxy. Which has dark matter, but no supermassive black hole. The initial comment was about a "central" black hole (which may indeed exist), not a "supermassive" black hole.