Astronomers reported neutral hydrogen in the gas around the distant quasar ULAS J1120+0641—not a new discovery of the element hydrogen. The quasar’s light, observed at redshift 7, offers a view of the universe in an exceptionally early era.
What does “quasar hydrogen found” mean?
The phrase refers to a report about gas surrounding ULAS J1120+0641. The astronomers described large amounts of neutral hydrogen in that environment, alongside a lack of elements heavier than helium. Hydrogen was already known; what was notable was the reported state and composition of gas around this distant quasar.
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The finding was reported by Phillip Broadwith in Chemistry World on 13 December 2012, based on a study by R. Simcoe and colleagues published in Nature 492, 79 (2012), DOI 10.1038/nature11612.
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The quasar was reported at redshift z = 7. Its light shows the universe as it was about 772 million years after the Big Bang, according to the 2012 report. That age is an estimate tied to cosmological assumptions, not a direct measurement of the quasar’s age.
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Looking at a distant object means receiving light that traveled for a long time. In this case, the observation lets astronomers study gas in a very young cosmic environment rather than one like the nearby universe today.
How did astronomers study the gas?
The team analyzed infrared spectral measurements made with the Magellan Baade telescopes in Chile. A spectrum carries information about light from the quasar and material along its path, helping researchers infer properties of the surrounding gas. The 2012 report does not provide enough methodological detail to reconstruct the full measurement and inference process.
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What did the report say about the hydrogen and other elements?
- Neutral hydrogen: The report characterized the hydrogen as neutral, meaning it was not ionized by starlight.
- Heavier elements: It described the environment as lacking elements heavier than helium. The report does not establish a precise abundance or prove that such elements were absolutely absent.
These descriptions apply to the reported observation of ULAS J1120+0641. They should not be generalized to every early quasar or treated as a complete account of the chemistry of the early universe.
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The result provides evidence about gas in the environment of one quasar when the universe was very young. It is not evidence that hydrogen itself was newly discovered, and the report alone does not support detailed numerical claims about hydrogen or metal abundances. For the underlying study, see the cited Nature paper by Simcoe and colleagues.
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