"Intermediate-mass black holes are very elusive objects, and so it is critical to carefully consider and rule out alternative explanations for each candidate. That is what Hubble has allowed us to do for our candidate."
Source: Comments made by Dacheng Lin of the University of New Hampshire, principal investigator of a study for which the results were published on March 31, 2020, in The Astrophysical Journal Letters. The study discuesses the report that astronomers have found the best evidence for the perpetrator of a cosmic homicide: a black hole of an elusive class known as "intermediate-mass," which betrayed its existence by tearing apart a wayward star that passed too close.