1 minute ago
Hi again everyone. It's @spacewsarah here back for my second post of the day, yet still on the same topic: galaxies. Here I’m showing you an image from a dark matter only computer simulation following the growth of a Milky Way-size system. This simulation is called the Via Lacteal II simulation and was published in Nature: Diemand et al. 2008. The simulation included more than 1 billion particles and what you’re seeing here are more than 40.000 dark matter clumps surrounding a galaxy mimicking our own Milky Way in mass and in interaction history. All the bright clumps are what we call “dark matter subhalos”. The smallest of them are “dark matter only galaxies” as they will not all be able to hold on to their “normal matter”. These clumps have not yet been detected directly by astronomers, but it is a crucial prediction within our current paradigm of cosmology that these should exist and orbit galaxies like our own. Fun fact: this simulation output is what I use as the background for my YouTube channel: Space with Sarah. Check out the simulation video in the link in bio.
Credit: Jurg Diemand, Diemand et al. 2008, Nature, Via Lactea II, http://www.ucolick.org/~diemand/vl/images.html
#darkmatter #galaxies #simulations #coding #universe #space #astrophysics #astronomy #science #scientist #phd @columbia #youtube #spacewithsarah #keepwondering