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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2501.00984 |
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| _version_ | 1866910077160521728 |
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| author | Whitler, Lily Stark, Daniel P. Topping, Michael W. Robertson, Brant Rieke, Marcia Hainline, Kevin N. Endsley, Ryan Chen, Zuyi Baker, William M. Bhatawdekar, Rachana Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Chevallard, Jacopo Curtis-Lake, Emma Egami, Eiichi Eisenstein, Daniel J. Helton, Jakob M. Ji, Zhiyuan Johnson, Benjamin D. Pérez-González, Pablo G. Rinaldi, Pierluigi Tacchella, Sandro Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Witstok, Joris |
| author_facet | Whitler, Lily Stark, Daniel P. Topping, Michael W. Robertson, Brant Rieke, Marcia Hainline, Kevin N. Endsley, Ryan Chen, Zuyi Baker, William M. Bhatawdekar, Rachana Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Chevallard, Jacopo Curtis-Lake, Emma Egami, Eiichi Eisenstein, Daniel J. Helton, Jakob M. Ji, Zhiyuan Johnson, Benjamin D. Pérez-González, Pablo G. Rinaldi, Pierluigi Tacchella, Sandro Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Witstok, Joris |
| contents | The high-redshift UV luminosity function provides important insights into the evolution of early galaxies. JWST has revealed an unexpectedly large population of bright ($M_\mathrm{UV} \lesssim -20$) galaxies at $z\gtrsim10$, implying fundamental changes in the star forming properties of galaxies at increasingly early times. However, constraining the fainter population ($M_\mathrm{UV} \gtrsim -18$) has been more challenging. In this work, we present the $z\gtrsim9$ UV luminosity function from the JWST Advanced Deep Extragalactic Survey. We calculate the UV luminosity function from several hundred $z\gtrsim9$ galaxy candidates that reach UV luminosities of $M_\mathrm{UV}\sim-17$ in redshift bins of $z\sim9-12$ (309 candidates) and $z\sim12-16$ (63 candidates). We search for candidates at $z\sim16-22.5$ and find none. We also estimate the $z\sim14-16$ luminosity function from the $z\geq14$ subset of the $z\sim12-16$ sample. Consistent with other measurements, we find an excess of bright galaxies that is in tension with many theoretical models, especially at $z\gtrsim12$. However, we also find high number densities at $-18\lesssim M_\mathrm{UV} \lesssim-17$, suggesting that there is a larger population of faint galaxies than expected, as well as bright ones. From our parametric fits for the luminosity function, we find steep faint end slopes of $-2.5\lesssimα\lesssim-2.3$, suggesting a large population of faint ($M_\mathrm{UV} \gtrsim -17$) galaxies. Combined, the high normalization and steep faint end slope of the luminosity function could imply that the reionization process is appreciably underway as early as $z=10$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_00984 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The $z \gtrsim 9$ galaxy UV luminosity function from the JWST Advanced Deep Extragalactic Survey: insights into early galaxy evolution and reionization Whitler, Lily Stark, Daniel P. Topping, Michael W. Robertson, Brant Rieke, Marcia Hainline, Kevin N. Endsley, Ryan Chen, Zuyi Baker, William M. Bhatawdekar, Rachana Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Chevallard, Jacopo Curtis-Lake, Emma Egami, Eiichi Eisenstein, Daniel J. Helton, Jakob M. Ji, Zhiyuan Johnson, Benjamin D. Pérez-González, Pablo G. Rinaldi, Pierluigi Tacchella, Sandro Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Witstok, Joris Astrophysics of Galaxies The high-redshift UV luminosity function provides important insights into the evolution of early galaxies. JWST has revealed an unexpectedly large population of bright ($M_\mathrm{UV} \lesssim -20$) galaxies at $z\gtrsim10$, implying fundamental changes in the star forming properties of galaxies at increasingly early times. However, constraining the fainter population ($M_\mathrm{UV} \gtrsim -18$) has been more challenging. In this work, we present the $z\gtrsim9$ UV luminosity function from the JWST Advanced Deep Extragalactic Survey. We calculate the UV luminosity function from several hundred $z\gtrsim9$ galaxy candidates that reach UV luminosities of $M_\mathrm{UV}\sim-17$ in redshift bins of $z\sim9-12$ (309 candidates) and $z\sim12-16$ (63 candidates). We search for candidates at $z\sim16-22.5$ and find none. We also estimate the $z\sim14-16$ luminosity function from the $z\geq14$ subset of the $z\sim12-16$ sample. Consistent with other measurements, we find an excess of bright galaxies that is in tension with many theoretical models, especially at $z\gtrsim12$. However, we also find high number densities at $-18\lesssim M_\mathrm{UV} \lesssim-17$, suggesting that there is a larger population of faint galaxies than expected, as well as bright ones. From our parametric fits for the luminosity function, we find steep faint end slopes of $-2.5\lesssimα\lesssim-2.3$, suggesting a large population of faint ($M_\mathrm{UV} \gtrsim -17$) galaxies. Combined, the high normalization and steep faint end slope of the luminosity function could imply that the reionization process is appreciably underway as early as $z=10$. |
| title | The $z \gtrsim 9$ galaxy UV luminosity function from the JWST Advanced Deep Extragalactic Survey: insights into early galaxy evolution and reionization |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.00984 |