A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: I. Properties of [OIII] Emitters in a 10 Mpc Overdensity Structure
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arXiv
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2024
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| author | Champagne, Jaclyn B. Wang, Feige Zhang, Haowen Yang, Jinyi Fan, Xiaohui Hennawi, Joseph F. Sun, Fengwu Bañados, Eduardo Bosman, Sarah E. I. Costa, Tiago Eilers, Anna-Christina Endsley, Ryan Jin, Xiangyu Jun, Hyunsung D. Li, Mingyu Lin, Xiaojing Liu, Weizhe Loiacono, Federica Lupi, Alessandro Mazzucchelli, Chiara Pudoka, Maria Protušovà, Klaudia Rojas-Ruiz, Sofia Tee, Wei Leong Trebitsch, Maxime Venemans, Bram P. Zhuang, Ming-Yang Zou, Siwei |
| author_facet | Champagne, Jaclyn B. Wang, Feige Zhang, Haowen Yang, Jinyi Fan, Xiaohui Hennawi, Joseph F. Sun, Fengwu Bañados, Eduardo Bosman, Sarah E. I. Costa, Tiago Eilers, Anna-Christina Endsley, Ryan Jin, Xiangyu Jun, Hyunsung D. Li, Mingyu Lin, Xiaojing Liu, Weizhe Loiacono, Federica Lupi, Alessandro Mazzucchelli, Chiara Pudoka, Maria Protušovà, Klaudia Rojas-Ruiz, Sofia Tee, Wei Leong Trebitsch, Maxime Venemans, Bram P. Zhuang, Ming-Yang Zou, Siwei |
| contents | ASPIRE (A SPectroscopic survey of bIased halos in the Reionization Era) is a quasar legacy survey primarily using \textit{JWST} to target a sample of 25 $z>6$ quasars with NIRCam slitless spectroscopy and imaging. The first study in this series found evidence of a strong overdensity of galaxies around J0305$-$3150, a luminous quasar at $z=6.61$, within a single NIRCam pointing obtained in JWST Cycle 1. Here, we present the first results of a JWST Cycle 2 mosaic that covers 35 arcmin$^2$ with NIRCam imaging/WFSS of the same field to investigate the spatial extent of the putative protocluster. The F356W grism data targets [OIII]+H$β$ at $5.3<z<7$ and reveals a population of 124 line emitters down to a flux limit of 1.2$\times$10$^{-18}$ erg s$^{-1}$ cm$^{-2}$. Fifty-three of these galaxies lie at $6.5<z<6.8$ spanning 10 cMpc on the sky, corresponding to an overdensity within a 2500 cMpc$^3$ volume of 12.5 $\pm$ 2.6, anchored by the quasar. Comparing to the [OIII] luminosity function from the Emission line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) project, we find a dearth of faint [OIII] emitters at log(L/erg\,s$^{-1}$) $<$ 42.3, which we suggest is consistent with either bursty star formation causing galaxies to scatter around the grism detection limit or modest suppression from quasar feedback. While we find a strong filamentary overdensity of [OIII] emitters consistent with a protocluster, we suggest that we could be insensitive to a population of older, more massive Lyman-break galaxies with weak nebular emission on scales $>10$ cMpc. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_03826 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: I. Properties of [OIII] Emitters in a 10 Mpc Overdensity Structure Champagne, Jaclyn B. Wang, Feige Zhang, Haowen Yang, Jinyi Fan, Xiaohui Hennawi, Joseph F. Sun, Fengwu Bañados, Eduardo Bosman, Sarah E. I. Costa, Tiago Eilers, Anna-Christina Endsley, Ryan Jin, Xiangyu Jun, Hyunsung D. Li, Mingyu Lin, Xiaojing Liu, Weizhe Loiacono, Federica Lupi, Alessandro Mazzucchelli, Chiara Pudoka, Maria Protušovà, Klaudia Rojas-Ruiz, Sofia Tee, Wei Leong Trebitsch, Maxime Venemans, Bram P. Zhuang, Ming-Yang Zou, Siwei Astrophysics of Galaxies ASPIRE (A SPectroscopic survey of bIased halos in the Reionization Era) is a quasar legacy survey primarily using \textit{JWST} to target a sample of 25 $z>6$ quasars with NIRCam slitless spectroscopy and imaging. The first study in this series found evidence of a strong overdensity of galaxies around J0305$-$3150, a luminous quasar at $z=6.61$, within a single NIRCam pointing obtained in JWST Cycle 1. Here, we present the first results of a JWST Cycle 2 mosaic that covers 35 arcmin$^2$ with NIRCam imaging/WFSS of the same field to investigate the spatial extent of the putative protocluster. The F356W grism data targets [OIII]+H$β$ at $5.3<z<7$ and reveals a population of 124 line emitters down to a flux limit of 1.2$\times$10$^{-18}$ erg s$^{-1}$ cm$^{-2}$. Fifty-three of these galaxies lie at $6.5<z<6.8$ spanning 10 cMpc on the sky, corresponding to an overdensity within a 2500 cMpc$^3$ volume of 12.5 $\pm$ 2.6, anchored by the quasar. Comparing to the [OIII] luminosity function from the Emission line galaxies and Intergalactic Gas in the Epoch of Reionization (EIGER) project, we find a dearth of faint [OIII] emitters at log(L/erg\,s$^{-1}$) $<$ 42.3, which we suggest is consistent with either bursty star formation causing galaxies to scatter around the grism detection limit or modest suppression from quasar feedback. While we find a strong filamentary overdensity of [OIII] emitters consistent with a protocluster, we suggest that we could be insensitive to a population of older, more massive Lyman-break galaxies with weak nebular emission on scales $>10$ cMpc. |
| title | A Quasar-Anchored Protocluster at z=6.6 in the ASPIRE Survey: I. Properties of [OIII] Emitters in a 10 Mpc Overdensity Structure |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.03826 |