Paulo Montero-Camacho, Catalina Morales-Gutiérrez, Yao Zhang, Heyang Long, Yi Mao
{"title":"Reionization relics in the cross-correlation between the Ly$α$ forest and 21 cm intensity mapping in the post-reionization era","authors":"Paulo Montero-Camacho, Catalina Morales-Gutiérrez, Yao Zhang, Heyang Long, Yi Mao","doi":"arxiv-2409.11613","DOIUrl":null,"url":null,"abstract":"The tumultuous effects of ultraviolet photons that source cosmic\nreionization, the subsequent compression and shock-heating of low-density\nregions, and the modulation of baryons in shallow potential wells induced by\nthe passage of ionization fronts, collectively introduce perturbations to the\nevolution of the intergalactic medium in the post-reionization era. These\nenduring fluctuations persist deep into the post-reionization era, casting a\nchallenge upon precision cosmology endeavors targeting tracers in this cosmic\nera. Simultaneously, these relics from reionization also present a unique\nopportunity to glean insights into the astrophysics that govern the epoch of\nreionization. In this work, we propose a first study of the cross-correlation\nof \\lya forest and 21 cm intensity mapping, accounting for the repercussions of\ninhomogeneous reionization in the post-reionization era. We investigate the\nability of SKA $\\times$ DESI-like, SKA $\\times$ MUST-like, and PUMA $\\times$\nMUST-like instrumental setups to achieve a high signal-to-noise ratio (SNR) in\nthe redshift range $3.5 \\leq z \\leq 4$. Moreover, we assess how alterations in\nintegration time, survey area, and reionization scenarios impact the SNR.\nFurthermore, we forecast the cross-correlation's potential to constrain\ncosmological parameters under varying assumptions: considering or disregarding\nreionization relics, marginalizing over reionization astrophysics, and assuming\nperfect knowledge of reionization. Notably, our findings underscore the\nremarkable capability of a futuristic PUMA $\\times$ MUST-like setup, with a\nmodest 100-hour integration time over a 100 sq. deg. survey, to constrain the\nionization efficiency error to $\\sigma_\\zeta = 3.42 $.","PeriodicalId":501207,"journal":{"name":"arXiv - PHYS - Cosmology and Nongalactic Astrophysics","volume":"3 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Cosmology and Nongalactic Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.11613","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The tumultuous effects of ultraviolet photons that source cosmic
reionization, the subsequent compression and shock-heating of low-density
regions, and the modulation of baryons in shallow potential wells induced by
the passage of ionization fronts, collectively introduce perturbations to the
evolution of the intergalactic medium in the post-reionization era. These
enduring fluctuations persist deep into the post-reionization era, casting a
challenge upon precision cosmology endeavors targeting tracers in this cosmic
era. Simultaneously, these relics from reionization also present a unique
opportunity to glean insights into the astrophysics that govern the epoch of
reionization. In this work, we propose a first study of the cross-correlation
of \lya forest and 21 cm intensity mapping, accounting for the repercussions of
inhomogeneous reionization in the post-reionization era. We investigate the
ability of SKA $\times$ DESI-like, SKA $\times$ MUST-like, and PUMA $\times$
MUST-like instrumental setups to achieve a high signal-to-noise ratio (SNR) in
the redshift range $3.5 \leq z \leq 4$. Moreover, we assess how alterations in
integration time, survey area, and reionization scenarios impact the SNR.
Furthermore, we forecast the cross-correlation's potential to constrain
cosmological parameters under varying assumptions: considering or disregarding
reionization relics, marginalizing over reionization astrophysics, and assuming
perfect knowledge of reionization. Notably, our findings underscore the
remarkable capability of a futuristic PUMA $\times$ MUST-like setup, with a
modest 100-hour integration time over a 100 sq. deg. survey, to constrain the
ionization efficiency error to $\sigma_\zeta = 3.42 $.