20.500.12556/RUL-169017 The JWST/PASSAGE Survey testing reionization histories with JWST's first unbiased survey for Lyα emitters at redshifts 7.5–9.5 Lyα emission is one of a few observable features of galaxies that can trace the neutral hydrogen content in the Universe during the Epoch of Reionization (EoR). To accomplish this, we need an efficient way to survey for Lyα emitters (LAEs) at redshifts beyond 7, requiring unbiased emission-line observations that are both sufficiently deep and wide to cover enough volume to detect them. Here we present results from PASSAGE—a pure-parallel JWST/NIRISS slitless spectroscopic survey to detect LAEs deep into the EoR, without the bias of photometric preselection. We identify four LAEs at 7.5 ≤ z ≤ 9.5 in four surveyed pointings and estimate the luminosity function (LF). We find that the LF does show a marked decrease compared to post-reionization measurements, but the change is a factor of ≲10, which is less than expected from theoretical calculations and simulations, as well as observational expectations from the pre-JWST literature. Modeling of the intergalactic medium and expected Lyα profiles implies that these galaxies reside in ionized bubbles of ⪆2 physical Mpc. We also report that in the four fields we detect {3, 1, 0, 0} LAEs, which could indicate strong field-to-field variation in the LAE distribution, consistent with a patchy H I distribution at z ∼ 8. We compare the recovered LAE number counts with expectations from simulations and discuss the potential implications for reionization and its morphology. Lyman-alpha galaxies high-redshift galaxies reionization true false true Angleški jezik Angleški jezik Članek v reviji 2025-05-07 14:24:53 2025-05-07 14:24:54 2025-05-08 04:19:54 0000-00-00 00:00:00 2025 0 0 15 str. id. 95 Vol. 984 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-05-01 524.8 1538-4357 10.3847/1538-4357/adc008 234951683 Runnholm_2025_ApJ_984_95.pdf Runnholm_2025_ApJ_984_95.pdf 1 41283C4E373E696E88FD21DD48BDB785 e49f15e7bb9c84564e606eec83f082b9da888f7a5bf2cf06cf4a15aa6bb7ffae b55729c7-2b3d-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210132 https://iopscience.iop.org/article/10.3847/1538-4357/adc008/pdf 1 1855fc1e-2b3d-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210131 Fakulteta za matematiko in fiziko 0 0 0