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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2510.11373 |
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| _version_ | 1866914089910927360 |
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| author | Meyer, Romain A. Wang, Feige Kakiichi, Koki Brammer, Gabe Champagne, Jackie Jurk, Katharina Li, Zihao Li, Zijian Musin, Marat Satyavolu, Sindhu Schindler, Jan-Torge Shuntov, Marko Xu, Yi Zou, Siwei Bian, Fuyan Casey, Caitlin Egami, Eiichi Fan, Xiaohui Jiang, Danyang Laporte, Nicolas Liu, Weizhe Oesch, Pascal Tasca, Lidia Yang, Jinyi Zhang, Zijian Akins, Hollis Cai, Zheng Coulter, Dave A. Huang, Jiamu Li, Mingyu Liu, Weizhe Liang, Yongming Jin, Xiangyu Kartaltepe, Jeyhan Matharu, Jasleen Pudoka, Maria Tee, Wei-Leong Witten, Callum Zhang, Haowen Zhu, Yongda |
| author_facet | Meyer, Romain A. Wang, Feige Kakiichi, Koki Brammer, Gabe Champagne, Jackie Jurk, Katharina Li, Zihao Li, Zijian Musin, Marat Satyavolu, Sindhu Schindler, Jan-Torge Shuntov, Marko Xu, Yi Zou, Siwei Bian, Fuyan Casey, Caitlin Egami, Eiichi Fan, Xiaohui Jiang, Danyang Laporte, Nicolas Liu, Weizhe Oesch, Pascal Tasca, Lidia Yang, Jinyi Zhang, Zijian Akins, Hollis Cai, Zheng Coulter, Dave A. Huang, Jiamu Li, Mingyu Liu, Weizhe Liang, Yongming Jin, Xiangyu Kartaltepe, Jeyhan Matharu, Jasleen Pudoka, Maria Tee, Wei-Leong Witten, Callum Zhang, Haowen Zhu, Yongda |
| contents | We present a spectroscopically-selected [OIII]+Hb emitters catalogue at 6.75<z<9.05 and the resulting [OIII] 5008 ÅLuminosity Function (LF) in the COSMOS field. We leverage the 0.3 deg$^{2}$ covered to date by COSMOS-3D using NIRCam/WFSS F444W (90% of the survey) to perform the largest spectroscopic search for [OIII] emitters at 6.75<z<9.05. We present our catalogue of 237 [OIII] emitters and their associated completeness function. The inferred constraints on the [OIII] LF enable us to characterise the knee of the [OIII] LF, resulting in improved [OIII] LF constraints at z~7,8. Notably, we find evidence for an accelerated decline of the [OIII] luminosity density between z~7 and z~8, which could be expected if the metallicity of [OIII] emitters, as well as the cosmic star-formation rate density, is declining at these redshifts. We find that theoretical models that reproduce the z~7,8 [OIII] LF do not reproduce well the [OIII] equivalent width distribution, pointing to potential challenges in the modelling of[OIII] and other nebular lines in the early Universe. Finally, we provide the first constraints on the cosmic variance of [OIII] emitters, estimating at 15% the relative uncertainty for the z~7,8 [OIII] LF in the 0.3 deg$^2$ field. This estimate is in good agreement with that inferred from clustering, and shows that the [OIII] LF derived from smaller extragalactic legacy fields is strongly affected by cosmic variance. Our results highlight the fundamental role that wide-area JWST slitless surveys play to map the galaxy large-scale structure down into the reionisation era, serving as a springboard for a variety of science cases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_11373 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JWST COSMOS-3D: Spectroscopic Census and Luminosity Function of [O III] Emitters at 6.75<z<9.05 in COSMOS Meyer, Romain A. Wang, Feige Kakiichi, Koki Brammer, Gabe Champagne, Jackie Jurk, Katharina Li, Zihao Li, Zijian Musin, Marat Satyavolu, Sindhu Schindler, Jan-Torge Shuntov, Marko Xu, Yi Zou, Siwei Bian, Fuyan Casey, Caitlin Egami, Eiichi Fan, Xiaohui Jiang, Danyang Laporte, Nicolas Liu, Weizhe Oesch, Pascal Tasca, Lidia Yang, Jinyi Zhang, Zijian Akins, Hollis Cai, Zheng Coulter, Dave A. Huang, Jiamu Li, Mingyu Liu, Weizhe Liang, Yongming Jin, Xiangyu Kartaltepe, Jeyhan Matharu, Jasleen Pudoka, Maria Tee, Wei-Leong Witten, Callum Zhang, Haowen Zhu, Yongda Astrophysics of Galaxies We present a spectroscopically-selected [OIII]+Hb emitters catalogue at 6.75<z<9.05 and the resulting [OIII] 5008 ÅLuminosity Function (LF) in the COSMOS field. We leverage the 0.3 deg$^{2}$ covered to date by COSMOS-3D using NIRCam/WFSS F444W (90% of the survey) to perform the largest spectroscopic search for [OIII] emitters at 6.75<z<9.05. We present our catalogue of 237 [OIII] emitters and their associated completeness function. The inferred constraints on the [OIII] LF enable us to characterise the knee of the [OIII] LF, resulting in improved [OIII] LF constraints at z~7,8. Notably, we find evidence for an accelerated decline of the [OIII] luminosity density between z~7 and z~8, which could be expected if the metallicity of [OIII] emitters, as well as the cosmic star-formation rate density, is declining at these redshifts. We find that theoretical models that reproduce the z~7,8 [OIII] LF do not reproduce well the [OIII] equivalent width distribution, pointing to potential challenges in the modelling of[OIII] and other nebular lines in the early Universe. Finally, we provide the first constraints on the cosmic variance of [OIII] emitters, estimating at 15% the relative uncertainty for the z~7,8 [OIII] LF in the 0.3 deg$^2$ field. This estimate is in good agreement with that inferred from clustering, and shows that the [OIII] LF derived from smaller extragalactic legacy fields is strongly affected by cosmic variance. Our results highlight the fundamental role that wide-area JWST slitless surveys play to map the galaxy large-scale structure down into the reionisation era, serving as a springboard for a variety of science cases. |
| title | JWST COSMOS-3D: Spectroscopic Census and Luminosity Function of [O III] Emitters at 6.75<z<9.05 in COSMOS |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.11373 |