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- W2897716543 abstract "Here we investigate how LyC-opaque systems present in the intergalactic medium at $zapprox3$ can distort the spectral shape of a uniform UV background (UVB) through radiative transfer (RT) effects. With this aim in mind, we perform a multi-frequency RT simulation through a cosmic volume of $10h^{-1}$~cMpc scale polluted by metals, and self-consistently derive the ions of all the species. The UVB spatial fluctuations are traced by the ratio of He$, rm scriptstyle II $ and H$, rm scriptstyle I $ column density, $eta$, and the ratio of C$,{rm {scriptstyle IV }}$ and Si$,{rm {scriptstyle IV }}$ optical depths, $zeta$. We find that: (i) $eta$ spatially fluctuates through over-dense systems ($Delta$) with statistically significant deviations $deltaeta >25$% in 18% of the volume ; (ii) same fluctuations in $zeta$ are also present in $34$% of the enriched domain (only 8% of the total volume) and derive from a combination of RT induced effects and in-homogeneous metal enrichment, both effective in systems with $Delta > 1.5$." @default.
- W2897716543 created "2018-10-26" @default.
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- W2897716543 date "2018-11-01" @default.
- W2897716543 modified "2023-10-16" @default.
- W2897716543 title "UV background fluctuations traced by metal ions atz≈ 3" @default.
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- W2897716543 doi "https://doi.org/10.1093/mnrasl/sly199" @default.
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