Science, Space and Technology News 2024
This illustration depicts two quasars in the process of merging. Using both the Gemini North telescope, one half of the International Gemini Observatory, which is supported in part by the U.S. National Science Foundation and operated by NSF NOIRLab, and the Subaru Telescope, a team of astronomers have discovered a pair of merging quasars seen only 900 million years after the Big Bang.
This period, known as the Cosmic Dawn, is crucial as it marks the beginning of star and galaxy formation which led to the reionization of the universe. These quasars provide insights into the formation of supermassive black holes and the early evolution of galaxies, highlighting a significant cosmological transition during the Epoch of Reionization.the Universe has been expanding.
Although we are not sure exactly when the first stars began to shine, we know that they must have formed sometime after the era of Recombination, when hydrogen and helium atoms formed , and before the oldest-known galaxies existed . The ultraviolet light emitted by the first stars broke down the neutral hydrogen gas filling the universe into hydrogen ions and free electrons, initiating the era of Reionization and the end of the Dark Ages of the universe.
“The statistical properties of quasars in the Epoch of Reionization tell us many things, such as the progress and origin of the reionization, the formation of supermassive black holes during Cosmic Dawn, and the earliest evolution of the quasar host galaxies,” said Yoshiki Matsuoka, an astronomer at Ehime University in Japan and lead author of the paper describing these results, published in theThis image, taken with the Hyper Suprime-Cam on the Subaru Telescope, shows a pair of quasars in the...
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