An ultra massive black hole! We covered the whole mass spectrum in this episode, from stellar mass, through intermediate mass, all the way to this beast!
Reposted from
The StarXiv ✨ podcast
One more Einstein ring (arxiv.org/abs/2502.13788), with an additional lensed arc that allowed for a 5 sigma detection of an ultramassive black hole, placing the Cosmic Horseshoe 1.5 sigma above the black hole mass - stellar velocity dispersion relation.
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