Redshift evolution of Lyman continuum escape fraction after JWST
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911120266100736 |
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| author | Ferrara, A. Giavalisco, M. Pentericci, L. Vanzella, E. Calabrò, A. Llerena, M. |
| author_facet | Ferrara, A. Giavalisco, M. Pentericci, L. Vanzella, E. Calabrò, A. Llerena, M. |
| contents | The LyC escape fraction from galaxies, $f_{\rm esc}$, is strongly boosted by galactic outflows. In the Attenuation-Free Model (AFM) accounting for the properties of $z>10$ galaxies, radiation-driven outflows develop once the galaxy specific star formation rate, ${\rm sSFR} \ge {\rm sSFR}^* \approx 25\ {\rm Gyr}^{-1}$. As the cosmic sSFR increases with redshift, so does $f_{\rm esc}(z)$, which, when globally averaged, grows from 0.007 to 0.6 in $0 < z < 20$. We successfully tested the model on specific data sub-samples. Our predictions are consistent with measurements of $f_{\rm esc}$ up to $z=9.5$, and provide a physical explanation for the observed decreasing trend of the mean UV galaxy spectral slope, $β$, towards high-$z$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_10619 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Redshift evolution of Lyman continuum escape fraction after JWST Ferrara, A. Giavalisco, M. Pentericci, L. Vanzella, E. Calabrò, A. Llerena, M. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The LyC escape fraction from galaxies, $f_{\rm esc}$, is strongly boosted by galactic outflows. In the Attenuation-Free Model (AFM) accounting for the properties of $z>10$ galaxies, radiation-driven outflows develop once the galaxy specific star formation rate, ${\rm sSFR} \ge {\rm sSFR}^* \approx 25\ {\rm Gyr}^{-1}$. As the cosmic sSFR increases with redshift, so does $f_{\rm esc}(z)$, which, when globally averaged, grows from 0.007 to 0.6 in $0 < z < 20$. We successfully tested the model on specific data sub-samples. Our predictions are consistent with measurements of $f_{\rm esc}$ up to $z=9.5$, and provide a physical explanation for the observed decreasing trend of the mean UV galaxy spectral slope, $β$, towards high-$z$. |
| title | Redshift evolution of Lyman continuum escape fraction after JWST |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2505.10619 |