nearby supernova, fast movers

Oliver Krause (MPIA) gave a beautiful talk about the discovery of light echos from the Cas A supernova and its identification as a type IIb. This identification was performed by taking a spectrum of the original supernova, but delayed by 300 years because it is being observed now in reflection from a nearby dust cloud! The identification is remarkable, because as of now it appears that the Local Group is way over-represented in type IIb SNe.

Lang and I worked on the fast-movers in our faint proper-motion paper.

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