A new study creates the first map of our galaxy’s ancient dead stars. In the first map of the 'galactic underworld', a study from the University of Sydney has revealed a vast graveyard that stretches three times the height of the Milky Way. It has also indicated where the dead stars lie. A grave
. At the same time, the core keeps compressing in on itself until – depending on its starting mass – it becomes either aIn neutron stars, the core is so dense that electrons and protons are forced to combine at the subatomic level into neutrons. This squeezes its total mass into an incredibly dense sphere smaller than a city. If the mass of the original star is greater than 25 times our Sun’s, that gravity-driven collapse continues, until the core is so dense that not even light can escape.
Newly-formed neutron stars and black holes conform to today’s galaxy, so astronomers know where to look. But the oldest neutron stars and black holes are like ghosts still haunting a house demolished long ago, so they are harder to find.“It was like trying to find the mythical elephant’s graveyard,” said Professor Tuthill, referring to a place where, according to legend, old elephants go to die alone, far from their group.
But nothing in the universe sits still for long, so even knowing the likely magnitudes of the explosive kicks was not enough: the researchers had to delve into the depths of cosmic time and reconstruct how they behaved over billions of years. The intricate models they built – together with University of Sydney Research Fellow Dr. Sanjib Sharma and Dr. Ryosuke Hirai of Monash University – encoded where the stars were born, where they met their fiery end, and their eventual dispersal as the galaxy evolved.“It was a bit of a shock,” said Dr. Sharma. “I work every day with images of the visible galaxy we know today, and I expected that the galactic underworld would be subtly different, but similar in broad strokes.
“Perhaps the most surprising finding from our study is that the kicks are so strong that the Milky Way will lose some of these remnants entirely,” said Dr. Hirai. “They are kicked so hard that about 30 percent of the neutron stars are flung out into intergalactic space, never to return.”
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