A Glimpse of the New Redshift Frontier Through Abell S1063
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arXiv
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| Natura: | Preprint |
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2024
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| author | Kokorev, Vasily Atek, Hakim Chisholm, John Endsley, Ryan Chemerynska, Iryna Muñoz, Julian B. Furtak, Lukas J. Pan, Richard Berg, Danielle Fujimoto, Seiji Oesch, Pascal A. Weibel, Andrea Adamo, Angela Blaizot, Jeremy Bouwens, Rychard Dessauges-Zavadsky, Miroslava Khullar, Gourav Korber, Damien Goovaerts, Ilias Jecmen, Michelle Labbé, Ivo Leclercq, Floriane Marques-Chaves, Rui Mason, Charlotte McQuinn, Kristen B. W. Naidu, Rohan Natarajan, Priyamvada Nelson, Erica Rosdahl, Joki Saldana-Lopez, Alberto Schaerer, Daniel Trebitsch, Maxime Volonteri, Marta Zitrin, Adi |
| author_facet | Kokorev, Vasily Atek, Hakim Chisholm, John Endsley, Ryan Chemerynska, Iryna Muñoz, Julian B. Furtak, Lukas J. Pan, Richard Berg, Danielle Fujimoto, Seiji Oesch, Pascal A. Weibel, Andrea Adamo, Angela Blaizot, Jeremy Bouwens, Rychard Dessauges-Zavadsky, Miroslava Khullar, Gourav Korber, Damien Goovaerts, Ilias Jecmen, Michelle Labbé, Ivo Leclercq, Floriane Marques-Chaves, Rui Mason, Charlotte McQuinn, Kristen B. W. Naidu, Rohan Natarajan, Priyamvada Nelson, Erica Rosdahl, Joki Saldana-Lopez, Alberto Schaerer, Daniel Trebitsch, Maxime Volonteri, Marta Zitrin, Adi |
| contents | We report the discovery of two galaxy candidates at redshifts between $15.7<z<16.4$ in JWST observations from the GLIMPSE survey. These robust sources were identified using a combination of Lyman-break selection and photometric redshift estimates. The ultra-deep NIRCam imaging from GLIMPSE, combined with the strong gravitational lensing of the Abell S1063 galaxy cluster, allows us to probe an intrinsically fainter population (down to $M_{\rm UV} =-17.0$ mag) than previously achievable. These galaxies have absolute magnitudes ranging from $M_{\rm UV} = -17.0$ to $-17.2$ mag, with blue ($β\simeq -2.87$) UV continuum slopes, consistent with young, dust-free stellar populations. The number density of these objects, log$_{\rm 10}$($ϕ$/[Mpc$^{-3}$ mag$^{-1}$])=$-3.47^{+0.13}_{-0.10}$ at $M_{\rm UV}=-17$ is in clear tension with pre-JWST theoretical predictions, extending the over-abundance of galaxies from $z\sim10$ to $z\sim 17$. These results, together with the scarcity of brighter galaxies in other public surveys, suggest a steep decline in the bright-end of the UV luminosity function at $z \sim 16$, implying efficient star formation and possibly a close connection to the halo mass function at these redshifts. Testing a variety of star formation histories suggests that these sources are plausible progenitors of the unusually UV-bright galaxies that JWST now routinely uncovers at $z = 10-14$. Overall, our results indicate that the luminosity distribution of the earliest star-forming galaxies could be shifting towards fainter luminosities, implying that future surveys of cosmic dawn will need to explore this faint luminosity regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_13640 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Glimpse of the New Redshift Frontier Through Abell S1063 Kokorev, Vasily Atek, Hakim Chisholm, John Endsley, Ryan Chemerynska, Iryna Muñoz, Julian B. Furtak, Lukas J. Pan, Richard Berg, Danielle Fujimoto, Seiji Oesch, Pascal A. Weibel, Andrea Adamo, Angela Blaizot, Jeremy Bouwens, Rychard Dessauges-Zavadsky, Miroslava Khullar, Gourav Korber, Damien Goovaerts, Ilias Jecmen, Michelle Labbé, Ivo Leclercq, Floriane Marques-Chaves, Rui Mason, Charlotte McQuinn, Kristen B. W. Naidu, Rohan Natarajan, Priyamvada Nelson, Erica Rosdahl, Joki Saldana-Lopez, Alberto Schaerer, Daniel Trebitsch, Maxime Volonteri, Marta Zitrin, Adi Astrophysics of Galaxies We report the discovery of two galaxy candidates at redshifts between $15.7<z<16.4$ in JWST observations from the GLIMPSE survey. These robust sources were identified using a combination of Lyman-break selection and photometric redshift estimates. The ultra-deep NIRCam imaging from GLIMPSE, combined with the strong gravitational lensing of the Abell S1063 galaxy cluster, allows us to probe an intrinsically fainter population (down to $M_{\rm UV} =-17.0$ mag) than previously achievable. These galaxies have absolute magnitudes ranging from $M_{\rm UV} = -17.0$ to $-17.2$ mag, with blue ($β\simeq -2.87$) UV continuum slopes, consistent with young, dust-free stellar populations. The number density of these objects, log$_{\rm 10}$($ϕ$/[Mpc$^{-3}$ mag$^{-1}$])=$-3.47^{+0.13}_{-0.10}$ at $M_{\rm UV}=-17$ is in clear tension with pre-JWST theoretical predictions, extending the over-abundance of galaxies from $z\sim10$ to $z\sim 17$. These results, together with the scarcity of brighter galaxies in other public surveys, suggest a steep decline in the bright-end of the UV luminosity function at $z \sim 16$, implying efficient star formation and possibly a close connection to the halo mass function at these redshifts. Testing a variety of star formation histories suggests that these sources are plausible progenitors of the unusually UV-bright galaxies that JWST now routinely uncovers at $z = 10-14$. Overall, our results indicate that the luminosity distribution of the earliest star-forming galaxies could be shifting towards fainter luminosities, implying that future surveys of cosmic dawn will need to explore this faint luminosity regime. |
| title | A Glimpse of the New Redshift Frontier Through Abell S1063 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.13640 |