Running Out of Gas: Gas Loss Puts Brakes on Stellar Baby Boom
Astronomers observed a galaxy cluster 9.4 billion light-years away using the ALMA radio telescope array and found evidence that hot gas strips away the cold gas in the member galaxies. Since cold gas is the material for forming new stars, removing the cold gas inhibits star formation. This result is key to understanding the declining birthrate of stars throughout the history of the Universe and the evolutionary process of galaxy clusters.
These observation results were published as Hayashi et al. “Evolutionary Phases of Gas-rich Galaxies in a Galaxy Cluster at z = 1.46” in the Astrophysical Journal Letters in May 2017.