PARIS: Interstellar tsunamis can act as a defibrillator for “red and dead” galaxies, astronomers have discovered. When neighboring clusters of galaxies merge it causes a shock wave and new generations of stars emerge in resurrected cosmic systems.
Comatose galaxies, that stopped star formations in the distant past but still interact with their cluster neighbors, have a chance to revive, show papers by a team of astronomers, led by Andra Stroe of Leiden Observatory and David Sobral of Leiden and the University of Lisbon. They were recently published in the journal Monthly Notices of the Royal Astronomical Society.
Scientists usually compare cosmic clusters, comprised by thousands of galaxies, with urban-like structures in infinite space. Over the course of billions of years, these structures merge or collide, releasing huge amounts of energy. The resulting so-called cosmic tsunami travels through a cluster, and boosts those galaxies that have little energy on their own.
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