CAPERS Observations of Two UV-Bright Galaxies at z>10. More Evidence for Bursting Star Formation in the Early Universe
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| Format: | Preprint |
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2025
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| author | Kokorev, Vasily Ortiz, Óscar A. Chávez Taylor, Anthony J. Finkelstein, Steven L. Haro, Pablo Arrabal Dickinson, Mark Chisholm, John Fujimoto, Seiji Muñoz, Julian B. Endsley, Ryan Hu, Weida Napolitano, Lorenzo Wilkins, Stephen M. Akins, Hollis B. Amoriín, Ricardo Casey, Caitlin M. Cheng, Yingjie Cleri, Nikko J. Cole, Justin Cullen, Fergus Daddi, Emanuele Davis, Kelcey Donnan, Callum T. Dunlop, James S. Fernández, Vital Giavalisco, Mauro Grogin, Norman A. Hathi, Nimish Hirschmann, Michaela Kartaltepe, Jeyhan S. Koekemoer, Anton M. Leung, Ho-Hin Lucas, Ray A. McLeod, Derek Papovich, Casey Pentericci, Laura Pérez-González, Pablo G. Somerville, Rachel S. Wang, Xin Yung, L. Y. Aaron Zavala, Jorge A. |
| author_facet | Kokorev, Vasily Ortiz, Óscar A. Chávez Taylor, Anthony J. Finkelstein, Steven L. Haro, Pablo Arrabal Dickinson, Mark Chisholm, John Fujimoto, Seiji Muñoz, Julian B. Endsley, Ryan Hu, Weida Napolitano, Lorenzo Wilkins, Stephen M. Akins, Hollis B. Amoriín, Ricardo Casey, Caitlin M. Cheng, Yingjie Cleri, Nikko J. Cole, Justin Cullen, Fergus Daddi, Emanuele Davis, Kelcey Donnan, Callum T. Dunlop, James S. Fernández, Vital Giavalisco, Mauro Grogin, Norman A. Hathi, Nimish Hirschmann, Michaela Kartaltepe, Jeyhan S. Koekemoer, Anton M. Leung, Ho-Hin Lucas, Ray A. McLeod, Derek Papovich, Casey Pentericci, Laura Pérez-González, Pablo G. Somerville, Rachel S. Wang, Xin Yung, L. Y. Aaron Zavala, Jorge A. |
| contents | We present the first results from the CAPERS survey, utilizing PRISM observations with the JWST/NIRSpec MSA in the PRIMER-UDS field. With just 14 % of the total planned data volume, we spectroscopically confirm two new bright galaxies ($M_{\rm UV}\sim -20.4$) at redshifts $z = 10.562\pm0.034$ and $z = 11.013\pm0.028$. We examine their physical properties, morphologies, and star formation histories, finding evidence for recent bursting star formation in at least one galaxy thanks to the detection of strong (EW$_0\sim70$ A) H$γ$ emission. Combining our findings with previous studies of similarly bright objects at high-$z$, we further assess the role of stochastic star formation processes in shaping early galaxy populations. Our analysis finds that the majority of bright ($M_{\rm UV}\lesssim -20$) spectroscopically-confirmed galaxies at $z>10$ were likely observed during a starburst episode, characterized by a median SFR$_{10}$/SFR$_{100}\sim2$, although with substantial scatter. Our work also finds tentative evidence that $z>10$ galaxies are more preferentially in a bursting phase than similarly bright $z\sim6$ galaxies. We finally discuss the prospects of deeper spectroscopic observations of a statistically significant number of bright galaxies to quantify the true impact of bursting star formation on the evolution of the bright end of the ultraviolet luminosity function at these early epochs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_12504 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | CAPERS Observations of Two UV-Bright Galaxies at z>10. More Evidence for Bursting Star Formation in the Early Universe Kokorev, Vasily Ortiz, Óscar A. Chávez Taylor, Anthony J. Finkelstein, Steven L. Haro, Pablo Arrabal Dickinson, Mark Chisholm, John Fujimoto, Seiji Muñoz, Julian B. Endsley, Ryan Hu, Weida Napolitano, Lorenzo Wilkins, Stephen M. Akins, Hollis B. Amoriín, Ricardo Casey, Caitlin M. Cheng, Yingjie Cleri, Nikko J. Cole, Justin Cullen, Fergus Daddi, Emanuele Davis, Kelcey Donnan, Callum T. Dunlop, James S. Fernández, Vital Giavalisco, Mauro Grogin, Norman A. Hathi, Nimish Hirschmann, Michaela Kartaltepe, Jeyhan S. Koekemoer, Anton M. Leung, Ho-Hin Lucas, Ray A. McLeod, Derek Papovich, Casey Pentericci, Laura Pérez-González, Pablo G. Somerville, Rachel S. Wang, Xin Yung, L. Y. Aaron Zavala, Jorge A. Astrophysics of Galaxies We present the first results from the CAPERS survey, utilizing PRISM observations with the JWST/NIRSpec MSA in the PRIMER-UDS field. With just 14 % of the total planned data volume, we spectroscopically confirm two new bright galaxies ($M_{\rm UV}\sim -20.4$) at redshifts $z = 10.562\pm0.034$ and $z = 11.013\pm0.028$. We examine their physical properties, morphologies, and star formation histories, finding evidence for recent bursting star formation in at least one galaxy thanks to the detection of strong (EW$_0\sim70$ A) H$γ$ emission. Combining our findings with previous studies of similarly bright objects at high-$z$, we further assess the role of stochastic star formation processes in shaping early galaxy populations. Our analysis finds that the majority of bright ($M_{\rm UV}\lesssim -20$) spectroscopically-confirmed galaxies at $z>10$ were likely observed during a starburst episode, characterized by a median SFR$_{10}$/SFR$_{100}\sim2$, although with substantial scatter. Our work also finds tentative evidence that $z>10$ galaxies are more preferentially in a bursting phase than similarly bright $z\sim6$ galaxies. We finally discuss the prospects of deeper spectroscopic observations of a statistically significant number of bright galaxies to quantify the true impact of bursting star formation on the evolution of the bright end of the ultraviolet luminosity function at these early epochs. |
| title | CAPERS Observations of Two UV-Bright Galaxies at z>10. More Evidence for Bursting Star Formation in the Early Universe |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.12504 |