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Positrons from normal, not dark, matter

9 Jul 2009, 12:03 UTC
Positrons from normal, not dark, matter ESA/ J. Knödlseder et al
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The ESA space observatory Integral had observed gamma-rays from the center of the galaxy, which indicated the presence of positrons distributed in a way that couldn’t quite be explained with known phenomenon. Hence some physicists speculated that the positrons may have been the result of dark matter annihilation. Not only did the distribution [...]

Gamma-rays from electron-positron annihilations in center of Milky Way
The ESA space observatory Integral had observed gamma-rays from the center of the galaxy, which indicated the presence of positrons distributed in a way that couldn’t quite be explained with known phenomenon. Hence some physicists speculated that the positrons may have been the result of dark matter annihilation. Not only did the distribution of positrons within our galaxy turn out to be lopsided, arguing against dark matter annihilation as the source, but it has now been explained how supernovae could be responsible for the distribution of positrons.
Some had thought that supernovae could not be the source of most of the positrons because it was assumed that they would all annihilate very close to their origin, which would not match the observed distribution of positrons. But it turns out that the positrons from supernovae, which are the ...

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