Ultra Light Boson Dark Matter and Event Horizon Telescope Observations of M87*
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(2019)cite arxiv:1904.09242Comment: 4 pages, 2 figures.

The initial data from the Event Horizon Telescope (EHT) on M87$^*$, the supermassive black hole at the center of the M87 galaxy, provide direct observational information on its mass, spin, and accretion disk properties. A combination of the EHT data and other constraints provide evidence that M87$^*$ has a mass $6.5 10^9\,M_ødot$ and dimensionless spin parameter $|a^*|0.5$. These determinations disfavor ultra light bosons of mass $\mu_b10^-21$ eV, within the range considered for fuzzy dark matter, invoked to explain dark matter distribution on $\sim$ kpc scales. Future observations of M87$^*$ could be expected to strengthen our conclusions.
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