Population search for dark matter spikes in megamaser rotation curves
This paper presents a population search for dark matter spikes around supermassive black holes using water megamaser rotation curves, finding that while spikes are preferred in specific galaxies like NGC 4258, the presence of disk warps and a strict upper limit of roughly 10% of the black hole mass for any spike significantly constrain the detection and highlight the need for improved mapping of disk geometry to break degeneracies.
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