The new observations help explain how galaxy sizes and their environment influence black hole behavior.
Cosmic voids are essentially"3D bubbles of space," some of which stretch over 500 million light-years across and contain just a handful of galaxies — if any at all. Also called the universe's wastelands, cosmic voids are thought to make up half of our universe, and together host 20% of its galaxy population.that the Milky Way, too, is contained in a spherical void whose radius is at least 1 billion light-years across, which is seven times larger than an average cosmic void.
The 80% of galaxies that live in the more populated corners of the universe are huddled close enough to interact gravitationally with each other and eventually merge. During this process, galaxies strip matter from one another, which in turn feeds the supermassive black holes at their centers.
The merger theory lacks a robust explanation of how black holes grow in galaxies that are friendless in their cosmic neighborhood and thus do not interact with each other, a process thought to be necessary to make stellar food available.
A"slice" about 30 million light years wide in the distribution of galaxies in the universe . Voids are shown as blue shaded regions, with galaxies within marked with red dots. The thumbnail on the right shows a void galaxy that harbors an actively accreting supermassive black hole in its center; such activity is revealed by its fluctuating mid-infrared brightness measurements.
France Dernières Nouvelles, France Actualités
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