(M104, NGC 4594, Messier 104)
(striking spiral galaxy with very large bulge)
The Sombrero Galaxy (M104 or Messier 104
or NGC 4594)
is a spiral galaxy about
31 million light-years distant that has a large
central bulge. It is very bright and has a very
massive central supermassive black hole.
It has been of recent interest because it shows enough
of the necessary characteristics to produce nanohertz gravitational waves
that it appears to be the most likely known source.
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