Late-end reionization with ATON-HE: towards constraints from Lyman-$α$ emitters observed with JWST
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914946986541056 |
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| author | Asthana, Shikhar Haehnelt, Martin G. Kulkarni, Girish Aubert, Dominique Bolton, James S. Keating, Laura C. |
| author_facet | Asthana, Shikhar Haehnelt, Martin G. Kulkarni, Girish Aubert, Dominique Bolton, James S. Keating, Laura C. |
| contents | We present a new suite of late-end reionization simulations performed with ATON-HE, a revised version of the GPU-based radiative transfer code ATON that includes helium. The simulations are able to reproduce the Ly$α$ flux distribution of the E-XQR-30 sample of QSO absorption spectra at $5 \lesssim z \lesssim 6.2$, and show that a large variety of reionization models are consistent with these data. We explore a range of variations in source models and in the early-stage evolution of reionization. Our fiducial reionization history has a midpoint of reionization at $z = 6.5$, but we also explore an `Early' reionization history with a midpoint at $z = 7.5$ and an `Extremely Early' reionization history with a midpoint at $z = 9.5$. Haloes massive enough to host observed Ly$α$ emitters are highly biased. The fraction of such haloes embedded in ionized bubbles that are large enough to allow high Ly$α$ transmission becomes close to unity much before the volume filling factor of ionized regions. For our fiducial reionization history this happens at $z = 8$, probably too late to be consistent with the detection by JWST of abundant Ly$α$ emission out to $z = 11$. A reionization history in our `Early' model or perhaps even our `Extremely Early' model may be required, suggesting a Thomson scattering optical depth in tension with that reported by Planck, but consistent with recent suggestions of a significantly higher value. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_06548 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Late-end reionization with ATON-HE: towards constraints from Lyman-$α$ emitters observed with JWST Asthana, Shikhar Haehnelt, Martin G. Kulkarni, Girish Aubert, Dominique Bolton, James S. Keating, Laura C. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We present a new suite of late-end reionization simulations performed with ATON-HE, a revised version of the GPU-based radiative transfer code ATON that includes helium. The simulations are able to reproduce the Ly$α$ flux distribution of the E-XQR-30 sample of QSO absorption spectra at $5 \lesssim z \lesssim 6.2$, and show that a large variety of reionization models are consistent with these data. We explore a range of variations in source models and in the early-stage evolution of reionization. Our fiducial reionization history has a midpoint of reionization at $z = 6.5$, but we also explore an `Early' reionization history with a midpoint at $z = 7.5$ and an `Extremely Early' reionization history with a midpoint at $z = 9.5$. Haloes massive enough to host observed Ly$α$ emitters are highly biased. The fraction of such haloes embedded in ionized bubbles that are large enough to allow high Ly$α$ transmission becomes close to unity much before the volume filling factor of ionized regions. For our fiducial reionization history this happens at $z = 8$, probably too late to be consistent with the detection by JWST of abundant Ly$α$ emission out to $z = 11$. A reionization history in our `Early' model or perhaps even our `Extremely Early' model may be required, suggesting a Thomson scattering optical depth in tension with that reported by Planck, but consistent with recent suggestions of a significantly higher value. |
| title | Late-end reionization with ATON-HE: towards constraints from Lyman-$α$ emitters observed with JWST |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2404.06548 |