#AthenaNuggets: Tracing the expanding universe with quasars
The #AthenaNuggets 42, written by Elisabeta Lusso, proposes the study of quasars as new cosmic tracers. These astronomical objects will allow the measurement of the expansion rate of the Universe up to z~10, i.e., when the Universe was less than 500 million years old. The role of the Athena will be fundamental to assess the state-of-the-art cosmological models, due to its accuracy in the determination of distant quasar X-ray fluxes.
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