Oleg Zabluda's blog
Thursday, September 08, 2016
 
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Astronomers have created the most detailed computer simulation to date of our Milky Way galaxy's formation [...] Previous simulations predicted that thousands of [...] satellite [...] dwarf, galaxies should exist. However, only about 30 of the small galaxies have ever been observed. Astronomers have been tinkering with the simulations, trying to understand this "missing satellites" problem to no avail.

Now, with the new simulation—which used a network of thousands of computers running in parallel for 700,000 central processing unit (CPU) hours—Caltech astronomers have created a galaxy that looks like the one we live in today, with the correct, smaller number of dwarf galaxies.
[...]
One of the main updates to the new simulation relates to how supernovae, [...] winds, which reach speeds up to thousands of kilometers per second, "can blow gas and stars out of a small galaxy," [...] Previous simulations that were producing thousands of dwarf galaxies weren't taking the full effects of supernovae into account.

"We had thought before that perhaps our understanding of dark matter was incorrect in these simulations, but these new results show we don't have to tinker with dark matter," says Wetzel. "When we more precisely model supernovae, we get the right answer."
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http://www.caltech.edu/news/recreating-our-galaxy-supercomputer-51995

Supercomputers Solve Case of Missing Galaxies
https://www.youtube.com/watch?v=b0R-2mM0Ghs

"Reconciling Dwarf Galaxies with ΛCDM Cosmology: Simulating A Realistic Population of Satellites Around a Milky Way-Mass Galaxy," (2016)
https://www.sciencedaily.com/releases/2016/09/160907135150.htm
http://www.caltech.edu/news/recreating-our-galaxy-supercomputer-51995

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