Multivariate Predictors of LyC Escape II: Predicting LyC Escape Fractions for High-Redshift Galaxies
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914949793579008 |
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| author | Jaskot, Anne E. Silveyra, Anneliese C. Plantinga, Anna Flury, Sophia R. Hayes, Matthew Chisholm, John Heckman, Timothy Pentericci, Laura Schaerer, Daniel Trebitsch, Maxime Verhamme, Anne Carr, Cody Ferguson, Henry C. Ji, Zhiyuan Giavalisco, Mauro Henry, Alaina Marques-Chaves, Rui Östlin, Göran Saldana-Lopez, Alberto Scarlata, Claudia Worseck, Gábor Xu, Xinfeng |
| author_facet | Jaskot, Anne E. Silveyra, Anneliese C. Plantinga, Anna Flury, Sophia R. Hayes, Matthew Chisholm, John Heckman, Timothy Pentericci, Laura Schaerer, Daniel Trebitsch, Maxime Verhamme, Anne Carr, Cody Ferguson, Henry C. Ji, Zhiyuan Giavalisco, Mauro Henry, Alaina Marques-Chaves, Rui Östlin, Göran Saldana-Lopez, Alberto Scarlata, Claudia Worseck, Gábor Xu, Xinfeng |
| contents | JWST is uncovering the properties of ever increasing numbers of galaxies at z>6, during the epoch of reionization. Connecting these observed populations to the process of reionization requires understanding how efficiently they produce Lyman continuum (LyC) photons and what fraction (fesc) of these photons escape into the intergalactic medium. By applying the Cox proportional hazards model, a survival analysis technique, to the Low-redshift Lyman Continuum Survey (LzLCS), we develop new, empirical, multivariate predictions for fesc. The models developed from the LzLCS reproduce the observed fesc for z~3 samples, which suggests that LyC emitters may share similar properties at low and high redshift. Our best-performing models for the z~3 galaxies include information about dust attenuation, ionization, and/or morphology. We then apply these models to z$\gtrsim$6 galaxies. For large photometric samples, we find a median predicted fesc=0.047-0.14. For smaller spectroscopic samples, which may include stronger emission line galaxies, we find that $\geq$33% of the galaxies have fesc >0.2, and we identify several candidate extreme leakers with fesc $\geq$0.5. The current samples show no strong trend between predicted fesc and UV magnitude, but limited spectroscopic information makes this result uncertain. Multivariate predictions can give significantly different results from single variable predictions, and the predicted fesc for high-redshift galaxies can differ significantly depending on whether star formation rate surface density or radius is used as a measure of galaxy morphology. We provide all parameters necessary to predict fesc for additional samples of high-redshift galaxies using these models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_10179 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multivariate Predictors of LyC Escape II: Predicting LyC Escape Fractions for High-Redshift Galaxies Jaskot, Anne E. Silveyra, Anneliese C. Plantinga, Anna Flury, Sophia R. Hayes, Matthew Chisholm, John Heckman, Timothy Pentericci, Laura Schaerer, Daniel Trebitsch, Maxime Verhamme, Anne Carr, Cody Ferguson, Henry C. Ji, Zhiyuan Giavalisco, Mauro Henry, Alaina Marques-Chaves, Rui Östlin, Göran Saldana-Lopez, Alberto Scarlata, Claudia Worseck, Gábor Xu, Xinfeng Astrophysics of Galaxies JWST is uncovering the properties of ever increasing numbers of galaxies at z>6, during the epoch of reionization. Connecting these observed populations to the process of reionization requires understanding how efficiently they produce Lyman continuum (LyC) photons and what fraction (fesc) of these photons escape into the intergalactic medium. By applying the Cox proportional hazards model, a survival analysis technique, to the Low-redshift Lyman Continuum Survey (LzLCS), we develop new, empirical, multivariate predictions for fesc. The models developed from the LzLCS reproduce the observed fesc for z~3 samples, which suggests that LyC emitters may share similar properties at low and high redshift. Our best-performing models for the z~3 galaxies include information about dust attenuation, ionization, and/or morphology. We then apply these models to z$\gtrsim$6 galaxies. For large photometric samples, we find a median predicted fesc=0.047-0.14. For smaller spectroscopic samples, which may include stronger emission line galaxies, we find that $\geq$33% of the galaxies have fesc >0.2, and we identify several candidate extreme leakers with fesc $\geq$0.5. The current samples show no strong trend between predicted fesc and UV magnitude, but limited spectroscopic information makes this result uncertain. Multivariate predictions can give significantly different results from single variable predictions, and the predicted fesc for high-redshift galaxies can differ significantly depending on whether star formation rate surface density or radius is used as a measure of galaxy morphology. We provide all parameters necessary to predict fesc for additional samples of high-redshift galaxies using these models. |
| title | Multivariate Predictors of LyC Escape II: Predicting LyC Escape Fractions for High-Redshift Galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.10179 |