20.500.12556/RUL-168996 Improving photometric redshifts of epoch of reionization galaxies a new empirical transmission curve with neutral hydrogen damping wing Lyα absorption We present a new analytical model for the attenuation to Epoch of Reionization (EoR) galaxies by proximate neutral hydrogen gas. Many galaxy spectra in the EoR taken by JWST have shown a flux deficit at wavelengths just redward of the Lyman break, and this has been regarded as resulting from Lyα damping wing absorption by the increasing amount of neutral hydrogen in the line of sight. However, previous attenuation models for the intergalactic medium (IGM) commonly used in photometric redshift template-fitting codes assume that the Lyman break is rather sharp, which leads to systematic overestimation of photometric redshifts at z > 7. In this Letter, we build and empirically calibrate a new attenuation model that takes the increased Lyα damping wing absorption into account. Our model consists of the canonical IGM absorption and an additional absorption component due to dense neutral hydrogen gas clouds proximate to the galaxy, and we derive the redshift evolution of H I column density of the proximate clouds by calibrating the model using CANUCS JWST observations. The resulting total transmission curve resolves the photometric redshift bias at z > 7, an improvement that is robust to the choice of template-fitting code, template set, and photometric catalog used. The new attenuation model can be easily implemented in existing template-fitting codes and significantly improves the photometric redshift performance in the EoR. high redshift galaxies reionization intergalactic medium true false true Angleški jezik Angleški jezik Članek v reviji 2025-05-06 16:20:41 2025-05-06 16:20:42 2025-05-07 04:05:41 0000-00-00 00:00:00 2025 0 0 9 str. L2 Vol. 983 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-04-01 524.8 2041-8213 10.3847/2041-8213/adc388 234950403 Asada_2025_ApJL_983_L2.pdf Asada_2025_ApJL_983_L2.pdf 1 AC51AF87E682D81B12F930DE434D3733 1b50cac6a69c80176a0f56aaef1465b3764ae28784cf365f769aeb41ef98846e 7663d604-2a84-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210098 https://iopscience.iop.org/article/10.3847/2041-8213/adc388/pdf 1 1c443d3d-2a84-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=210097 Fakulteta za matematiko in fiziko 0 0 0