New form of dark matter could solve decades-old Milky Way mystery
New form of dark matter could solve decades-old Milky Way mystery
LONDON: (Apr 17) Astronomers have long been puzzled by two strange phenomena at the heart of our galaxy. First, the gas in the central molecular zone (CMZ), a dense and chaotic region near the Milky Way’s core, appears to be ionised (meaning it is electrically charged because it has lost electrons) at a surprisingly high rate.
Second, telescopes have detected a mysterious glow of gamma rays with an energy of 511 kilo-electronvolts (keV) (which corresponds to the energy of an electron at rest).
Interestingly, such gamma rays are produced when an electron and its antimatter counterpart (all fundamental charged particles have antimatter versions of themselves that are near identical, but with opposite charge), the positron, collide and annihilate in a flash of light.
