You might have to travel a half a billion light years from the Milky Way to find another cosmological wall with a galaxy like ours.
New research based on Illustris TNG shows that the Milky Way is special. But it’s not special purely for its intrinsic qualities. It’s special in relation to its surroundings.
This image from TNG 50 shows the large-scale structure of cosmic gas in the early Universe at redshift three. It shows a region of space 15 megaparsecs across, where the cosmic web of gas filaments come together to fuel galactic formation and growth. Image Credit: Illustris TNG 50. The study also shows that the Milky Way is special. While typical galaxies tend to be much smaller in relation to walls, the Milky Way is surprisingly massive in relation to the Local Wall. According to the research, this is a rare cosmic occurrence.
of volume in the simulation. With their research, they showed that the cold environment around the Local Sheet is responsible. “We find that a Sheet-like cold environment preserves, amplifies, or simplifies environmental effects on the angular momentum of galaxies,” they write in their paper. . The legend in the upper right shows how each line in the graph represents a different velocity dispersal The blue solid line is the mass function in cold regions, and the black solid line is the mass function in warm regions. The dotted lines are the same, but for regions near Cosmic Walls. It shows how lower velocity dispersal produces less massive galaxies near walls. There are also two shaded grey areas: light and dark grey.
“The Milky Way doesn’t have a particularly special mass or type. There are lots of spiral galaxies that look roughly like it,” Joe Silk, another of the researchers, said. “But it is rare if you take into account its surroundings. If you could see the nearest dozen or so large galaxies easily in the sky, you would see that they all nearly lie on a ring embedded in the Local Sheet. That’s a little bit special in itself.
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