A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure
A SPectroscopic survey of bIased halos in the Reionization Era is a quasar legacy survey primarily using 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,...
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2025-01-01
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| author | Jaclyn B. Champagne Feige Wang Haowen Zhang Jinyi Yang Xiaohui Fan Joseph F. Hennawi Fengwu Sun Eduardo Bañados Sarah E. I. Bosman Tiago Costa Anna-Christina Eilers Ryan Endsley Xiangyu Jin Hyunsung D. Jun Mingyu Li Xiaojing Lin Weizhe Liu Federica Loiacono Alessandro Lupi Chiara Mazzucchelli Maria Pudoka Klaudia Protušovà Sofía Rojas-Ruiz Wei Leong Tee Maxime Trebitsch Bram P. Venemans Ming-Yang Zhuang Siwei Zou |
| author_facet | Jaclyn B. Champagne Feige Wang Haowen Zhang Jinyi Yang Xiaohui Fan Joseph F. Hennawi Fengwu Sun Eduardo Bañados Sarah E. I. Bosman Tiago Costa Anna-Christina Eilers Ryan Endsley Xiangyu Jin Hyunsung D. Jun Mingyu Li Xiaojing Lin Weizhe Liu Federica Loiacono Alessandro Lupi Chiara Mazzucchelli Maria Pudoka Klaudia Protušovà Sofía Rojas-Ruiz Wei Leong Tee Maxime Trebitsch Bram P. Venemans Ming-Yang Zhuang Siwei Zou |
| author_sort | Jaclyn B. Champagne |
| collection | DOAJ |
| description | A SPectroscopic survey of bIased halos in the Reionization Era is a quasar legacy survey primarily using 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/wide-field slitless spectroscopy of the same field to investigate the spatial extent of the putative protocluster. The F356W grism data target [O iii ]+H β at 5.3 < z < 7 and reveal a population of 124 line emitters down to a flux limit of 1.2 × 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 ± 2.6, anchored by the quasar. Comparing to the [O iii ] luminosity function from the Emission line galaxies and Intergalactic Gas in the Epoch of Reionization project, we find a dearth of faint [O iii ] 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 [O iii ] 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 | Article |
| id | doaj-art-0e38e9ea87404a35acd5a6f64b3f5d2a |
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| spelling | doaj-art-0e38e9ea87404a35acd5a6f64b3f5d2a2025-08-20T03:00:04ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01981211310.3847/1538-4357/adb1bdA Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity StructureJaclyn B. Champagne0https://orcid.org/0000-0002-6184-9097Feige Wang1https://orcid.org/0000-0002-7633-431XHaowen Zhang2https://orcid.org/0000-0002-4321-3538Jinyi Yang3https://orcid.org/0000-0001-5287-4242Xiaohui Fan4https://orcid.org/0000-0003-3310-0131Joseph F. Hennawi5https://orcid.org/0000-0002-7054-4332Fengwu Sun6https://orcid.org/0000-0002-4622-6617Eduardo Bañados7https://orcid.org/0000-0002-2931-7824Sarah E. I. Bosman8https://orcid.org/0000-0001-8582-7012Tiago Costa9https://orcid.org/0000-0002-6748-2900Anna-Christina Eilers10https://orcid.org/0000-0003-2895-6218Ryan Endsley11https://orcid.org/0000-0003-4564-2771Xiangyu Jin12https://orcid.org/0000-0002-5768-738XHyunsung D. Jun13https://orcid.org/0000-0003-1470-5901Mingyu Li14https://orcid.org/0000-0001-6251-649XXiaojing Lin15https://orcid.org/0000-0001-6052-4234Weizhe Liu16https://orcid.org/0000-0003-3762-7344Federica Loiacono17https://orcid.org/0000-0002-8858-6784Alessandro Lupi18https://orcid.org/0000-0001-6106-7821Chiara Mazzucchelli19https://orcid.org/0000-0002-5941-5214Maria Pudoka20https://orcid.org/0000-0003-4924-5941Klaudia Protušovà21Sofía Rojas-Ruiz22https://orcid.org/0000-0003-2349-9310Wei Leong Tee23https://orcid.org/0000-0003-0747-1780Maxime Trebitsch24https://orcid.org/0000-0002-6849-5375Bram P. Venemans25https://orcid.org/0000-0001-9024-8322Ming-Yang Zhuang26https://orcid.org/0000-0001-5105-2837Siwei Zou27https://orcid.org/0000-0002-3983-6484Steward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduSteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.edu; Department of Astronomy, University of Michigan , 1085 S. University Ave., Ann Arbor, MI 48109, USASteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduSteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.edu; Department of Astronomy, University of Michigan , 1085 S. University Ave., Ann Arbor, MI 48109, USASteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduDepartment of Physics, University of California, Santa Barbara , Santa Barbara, CA 93106-9530, USASteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduMax Planck Institut für Astronomie , Königstuhl 17, D-69117, Heidelberg, GermanyInstitute for Theoretical Physics, Heidelberg University , Philosophenweg 12, D-69120, Heidelberg, Germany; Max-Planck-Institut für Astronomie , Königstuhl 17, 69117 Heidelberg, GermanySchool of Mathematics, Statistics and Physics, Newcastle University , Newcastle upon Tyne, NE1 7RU, UKDepartment of Physics, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; MIT Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USADepartment of Astronomy, University of Texas Austin , 2515 Speedway Blvd., Austin, TX 78712, USASteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduDepartment of Physics , Northwestern College, 101 7th St. SW, Orange City, IA 51041, USADepartment of Astronomy, Tsinghua University , Beijing 100084, People’s Republic of ChinaSteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduSteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduINAF—Osservatorio di Astrofisica e Scienza dello Spazio di Bologna , via Gobetti 93/3, I-40129, Bologna, ItalyDipartimento di Scienza e Alta Tecnologia, Università degli Studi dell’Insubria , via Valleggio 11, I-22100, Como, Italy; INFN, Sezione di Milano-Bicocca , Piazza della Scienza 3, I-20126 Milano, Italy; Dipartimento di Fisica “G. Occhialini,” Università degli Studi di Milano-Bicocca , Piazza della Scienza 3, I-20126 Milano, ItalyInstituto de Estudios Astrofísicos , Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Avenida Ejercito Libertador 441, Santiago, ChileSteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduInstitute for Theoretical Physics, Heidelberg University , Philosophenweg 12, D-69120, Heidelberg, Germany; Max-Planck-Institut für Astronomie , Königstuhl 17, 69117 Heidelberg, GermanyDepartment of Physics and Astronomy, University of California , Los Angeles, 430 Portola Plaza, Los Angeles, CA 90095, USASteward Observatory, University of Arizona , 933 N. Cherry Ave., Tucson, AZ 85721, USA ; jbchampagne@arizona.eduKapteyn Astronomical Institute, University of Groningen , P.O Box 800, 9700 AV Groningen, The NetherlandsLeiden Observatory, Leiden University , Einsteinweg 55, NL-2333 CC Leiden, The NetherlandsDepartment of Astronomy, University of Illinois Urbana-Champaign , Urbana, IL 61801, USAChinese Academy of Sciences South America Center for Astronomy , National Astronomical Observatories, CAS, Beijing 100101, People’s Republic of ChinaA SPectroscopic survey of bIased halos in the Reionization Era is a quasar legacy survey primarily using 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/wide-field slitless spectroscopy of the same field to investigate the spatial extent of the putative protocluster. The F356W grism data target [O iii ]+H β at 5.3 < z < 7 and reveal a population of 124 line emitters down to a flux limit of 1.2 × 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 ± 2.6, anchored by the quasar. Comparing to the [O iii ] luminosity function from the Emission line galaxies and Intergalactic Gas in the Epoch of Reionization project, we find a dearth of faint [O iii ] 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 [O iii ] 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.https://doi.org/10.3847/1538-4357/adb1bdQuasarsJames Webb Space TelescopeProtoclustersHigh-redshift galaxiesGalaxy spectroscopy |
| spellingShingle | Jaclyn B. Champagne Feige Wang Haowen Zhang Jinyi Yang Xiaohui Fan Joseph F. Hennawi Fengwu Sun Eduardo Bañados Sarah E. I. Bosman Tiago Costa Anna-Christina Eilers Ryan Endsley Xiangyu Jin Hyunsung D. Jun Mingyu Li Xiaojing Lin Weizhe Liu Federica Loiacono Alessandro Lupi Chiara Mazzucchelli Maria Pudoka Klaudia Protušovà Sofía Rojas-Ruiz Wei Leong Tee Maxime Trebitsch Bram P. Venemans Ming-Yang Zhuang Siwei Zou A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure The Astrophysical Journal Quasars James Webb Space Telescope Protoclusters High-redshift galaxies Galaxy spectroscopy |
| title | A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure |
| title_full | A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure |
| title_fullStr | A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure |
| title_full_unstemmed | A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure |
| title_short | A Quasar-anchored Protocluster at z = 6.6 in the ASPIRE Survey. I. Properties of [O iii] Emitters in a 10 Mpc Overdensity Structure |
| title_sort | quasar anchored protocluster at z 6 6 in the aspire survey i properties of o iii emitters in a 10 mpc overdensity structure |
| topic | Quasars James Webb Space Telescope Protoclusters High-redshift galaxies Galaxy spectroscopy |
| url | https://doi.org/10.3847/1538-4357/adb1bd |
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