Astronomers determine the time when all the neutral hydrogen gas between galaxies produced by the Big Bang became fully ionized. A group of astronomers has robustly timed the end of the epoch of reionization of the neutral hydrogen gas to approximately 1.1 billion years after the Big Bang. Reioni
Schematic representation of the view into cosmic history provided by the bright light of distant quasars. Observing with a telescope allows us to gain information about the so-called reionization epoch that followed the Big Bang phase . Credit: Carnegie Institution for Science / MPIA Big BangA group of astronomers has robustly timed the end of the epoch of reionization of the neutral hydrogen gas to approximately 1.1 billion years after the Big Bang.
This indirect approach is currently the only way to characterize the objects that drove the process of reionization. Observing those first stars and galaxies directly is beyond the capabilities of contemporary telescopes. They are simply too faint to obtain useful data within a reasonable amount of time. Even next-generation facilities likemay struggle with such a task.
Depending on the fraction between neutral and ionized hydrogen gas, the degree of absorption, or inversely, the transmission through such a cloud, attains a particular value. When the light encounters a region with a high fraction of ionized gas, it cannot absorb UV radiation that efficiently. This property is what the team was looking for.
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