Analyzing light from some distant objects in space, a team of astronomers has presented a clear picture of one of the key events in the formation of our universe. It turned out that the cosmic dawn ended much later than astronomers thought. After the Big Bang explosion set the stage for the creation of the universe, it was subject to hydrogen for millions of years. This hydrogen then gradually began to disappear as the light from the newly formed stars and galaxies ionized and ripped it apart. This period is described by astronomers as the cosmic dawn.
scientists and researchers are able to decide When the cosmic dawn began, but its end, remains a matter of debate. To shed light on the mystery, a team of astronomers from the Max Planck Institute for Astronomy, Germany, used light from distant objects and concluded that the cosmic dawn ended much later than previously believed.
Studies conducted more than 50 years ago found light from quasars to be absorbed by floating gas in a nearby space medium. Seeing a series of quasars some distance away in the sky shows neutral hydrogen gas being ionized by light.
The idea may be obvious to astronomers, but it has been difficult for them to determine a timeline using only a few quasars. While light is distorted by the expansion of the universe, it also passes through pockets of hydrogen formed after cosmic dawn.
Expanding the research, astronomers have analyzed light from a total of 67 quasars in new research published in the Monthly Notices of the Royal Astronomical Society. They aimed to understand the effect of fresh hydrogen pockets to identify more distant bursts of ionization.
According to the researcher’s data, the last remnants of the original hydrogen became ionized 1.1 billion years after the Big Bang.
“Until a few years ago, the prevailing wisdom was that the reunification was completed about 200 million years ago,” Told Astronomer Frederick Davies of the Max Planck Institute for Astronomy. Davis said the latest evidence suggested that the cosmic dawn ended during a cosmic epoch that could be observed using current-generation observational facilities.