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M87 is an active galaxy with an accreting, rotating central black hole of mass $M\simeq6.5\times10^9M_{\odot}$ (Akiyama et al. 2019). It is the inner disk surrounding this black hole that produces, among radiation, the 1.3 mm synchrotron emission observed by the Event Horizon Telescope, as well as the relativistic jets emitted perpendicular to the disk's ...


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The supernova rate is only estimated/known to a factor of 2-3, so high levels of accuracy are not possible or warranted. If we assume high mass stars are born uniformly in a disc of radius $r$ light years, then you can work out a "surface density rate" of supernovae of $1/100 \pi r^2$ per square light year, per year (adopting your rate of one per ...


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