The team used the Atacama Large Millimeter/submillimeter Array (ALMA) to observe a sample of star-forming galaxies in the early universe, when the universe was only a few billion years old. They found that these galaxies were forming stars at a much higher rate than expected, and that they had a much shorter star-formation timescale than previously thought.
The study's findings challenge our current understanding of how galaxies form and evolve in the early universe. They suggest that the early universe was a much more dynamic and active place than previously thought, and that galaxies evolved much faster than we thought.
"Our findings suggest that the early universe was a very different place than we thought," said lead author Dr. Richard Sedgewick, from the University of California, Berkeley. "Galaxies were forming stars at a much higher rate and had a much shorter star-formation timescale than we previously thought. This is a major challenge to our current models of galaxy formation and evolution."
The team observed a sample of 10 star-forming galaxies in the early universe. They used ALMA to measure the galaxies' star-formation rates and gas masses. They found that the galaxies were forming stars at a rate of 100 to 1,000 times the mass of the Sun per year. This is much higher than the star-formation rates of galaxies in the present-day universe.
The team also found that the galaxies had a star-formation timescale of only a few hundred million years. This is much shorter than the star-formation timescale of galaxies in the present-day universe, which is typically a few billion years.
The study's findings suggest that the early universe was a much more dynamic and active place than we thought. Galaxies were forming stars at a much higher rate and had a much shorter star-formation timescale than we previously thought. This is a major challenge to our current models of galaxy formation and evolution.
"Our findings suggest that we need to rethink our models of how galaxies form and evolve in the early universe," said co-author Dr. Ian Smail, from the University of Durham. "The early universe was a very different place than we thought, and galaxies evolved much faster than we thought."
