ESO — ALMA captures distant colliding galaxy dying out as it loses the ability to form stars — Science Release eso2101

ESO — Reaching New Heights in Astronomy Subscription preferences | Unsubscribe | View in browser European Southern Observatory ESO News 11 January 2021 11 January 2021 — ESO Science Release eso2101 ALMA captures distant colliding galaxy dying out as it loses the ability to form stars Galaxies begin to "die" when they stop forming stars, but until now astronomers had never clearly glimpsed the start of this process in a far-away galaxy. Using the Atacama Large Millimeter/submillimeter Array (ALMA), in which the European Southern Observatory (ESO) is a partner, astronomers have seen a galaxy ejecting nearly half of its star-forming gas. This ejection is happening at a startling rate, equivalent to 10 000 Suns-worth of gas a year — the galaxy is rapidly losing its fuel to make new stars. The team believes that this spectacular event was triggered by a collision with another galaxy, which could lead astronomers to rethink how galaxies stop bringing new stars to life. 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