Paola Santini

Mar 6, 2024 | nature.com | Kristan Boyett |Michele Trenti |Nicha Leethochawalit |Benjamin Metha |Guido Roberts-Borsani |Paola Santini | +12 more

AbstractJames Webb Space Telescope observations have spectroscopically confirmed the existence of galaxies as early as 300 Myr after the Big Bang and with a higher number density than what was expected based on galaxy formation models and Hubble Space Telescope observations.

Jan 17, 2024 | nature.com | Nicolas Laporte |Yuxuan Yuan |William Baker |Anton Koekemoer |Daniel L Magee |William McClymont | +9 more

AbstractDuring the epoch of reionization, the first galaxies were enshrouded in pristine neutral gas, with one of the brightest emission lines in star-forming galaxies, Lyman α (Lyα), expected to remain undetected until the Universe became ionized. Providing an explanation for the surprising detection of Lyα in these early galaxies is a major challenge for extragalactic studies.

May 17, 2023 | nature.com | Guido Roberts-Borsani |Wenlei Chen |Eros Vanzella |Pietro Bergamini |Marco Castellano |Karl Glazebrook | +19 more

AbstractIn the first billion years after the Big Bang, sources of ultraviolet (UV) photons are believed to have ionized intergalactic hydrogen, rendering the Universe transparent to UV radiation. Galaxies brighter than the characteristic luminosity L* (refs. 1,2) do not provide enough ionizing photons to drive this cosmic reionization.