Galaxies Are Born Of Violence Between Dark Matter and Interstellar Gas
- URL to an article in Science Daily News
Also has some links to more articles about dark matter
First few paragraphs
"ScienceDaily (Nov. 30, 2007) — Researchers using supercomputer simulations
have exposed a very violent and critical relationship between interstellar
gas and dark matter when galaxies are born -- one that has been largely ignored
by the current model of how the universe evolved.
See also: The findings, published in Science, solve a longstanding problem
of the widely accepted model -- Cold Dark Matter cosmology -- which suggests
there is much more dark matter in the central regions of galaxies than actual
scientific observations suggest.
"This standard model has been hugely successful on the largest of
scales--those above a few million light-years--but suffers from several persistent
difficulties in predicting the internal properties of galaxies," says Sergey
Mashchenko, research associate in the Department of Physics & Astronomy at
McMaster University. "One of the most troublesome issues concerns the mysterious
dark matter that dominates the mass of most galaxies."
Supercomputer cosmological simulations prove that indeed, this problem can be
resolved. Researchers modeled the formation of a dwarf galaxy to illustrate
the very violent processes galaxies suffer at their births, a process in
which dense gas clouds in the galaxy form massive stars, which, at the ends of
their lives, blow up as supernovae.
"These huge explosions push the interstellar gas clouds back and forth in the
centre of the galaxy," says Mashchenko, the lead author of the study. "Our
high-resolution model did extremely accurate simulations, showing that this
'sloshing' effect -- similar to water in a bathtub-- kicks most of the dark
matter out of the centre of the galaxy."
("The avalanche has started, it's too late for the pebbles to vote.")
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