https://phys.org/news/2020-01-astrophysicists-massive-black-holes-dwarf.html Astrophysicists find massive black holes wandering around dwarf galaxies: A new search led by Montana State University has revealed more than a dozen massive black holes in dwarf galaxies that were previously considered too small to host them, and surprised scientists with their location within the galaxies. The study, headed by MSU astrophysicist Amy Reines, searched 111 dwarf galaxies within a billion light years of Earth using the National Science Foundation's Karl G. Jansky Very Large Array at the National Radio Astronomy Observatory, two hours outside Albuquerque in the plains of New Mexico. Reines identified 13 galaxies that "almost certainly" host massive black holes and found something unexpected: The majority of the black holes were not in the location she anticipated. "All of the black holes I had found before were in the centers of galaxies," said Reines, an assistant professor in the Department of Physics in the College of Letters and Science and a researcher in MSU's eXtreme Gravity Institute. "These were roaming around the outskirts. I was blown away when I saw this." more at link... the paper: https://iopscience.iop.org/article/10.3847/1538-4357/ab4999 and... https://arxiv.org/abs/1909.04670 A New Sample of (Wandering) Massive Black Holes in Dwarf Galaxies from High Resolution Radio Observations:
I'm not sure if there is really much to explain actually. I mean before it was reasonably common knowledge that "most large "spiral" galaxies did have a SMBH at or near their core. What we seem to have here, is the discovery of "wandering" SMBH's within some dwarf/irregular type galaxies. I'm no expert but perhaps some SMBH has virtually swallowed all or most of the stars within its galaxy...perhaps some merger of two or more galaxies has "kicked" the SMBH along with a grouping of stars, out into the void. Who knows at this time? With further observational studies and along with their ability to virtually take pictures of BH's now, in time answers should be forthcoming. But yeah, interesting stuff!
