Dark matter may scatter against each other only when they hit the right energy, say researchers in Japan, Germany, and Austria in a new study. Their idea helps explain why galaxies from the smallest to the biggest have the shapes they do.
Dark matter is a mysterious and unknown form of matter that comprises more than 80 per cent of matter in the Universe today...
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February 17, 2017,
Astronomy/Space
The giant elliptical galaxy NGC 4472. Courtesy of David W. Hogg, Michael R. Blanton, and the Sloan Digital Sky Survey Collaboration.
The distribution of normal matter precisely determines gravitational acceleration in all common types of galaxies, a team led by Case Western Reserve University researchers reports. The team has shown this radial acceleration relation exists in nearby high-mass elliptical and low-mass spheroidal galaxies, building on last year’s discovery of this relation in spiral and irregular galaxies.
“This demonstrates that we truly have a universal law for galactic systems,” said Federico Lelli, formerly an astronomy postdoctoral fellow at Case Western Reserve University and currently a fellow at the European Southern Observatory...
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