Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies
We present narrowband imaging of a spectroscopically confirmed protocluster “D4UD01” at z = 3.24 using CFHT/WIRCam. We identify a sample of 24 [O iii ] emission-line galaxies in the field, which forms a large overdensity in the protocluster region. The protocluster is expected to evolve into a Virgo...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adce72 |
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| author | Ke Shi Jun Toshikawa Xianzhong Zheng Zheng Cai Dongdong Shi |
| author_facet | Ke Shi Jun Toshikawa Xianzhong Zheng Zheng Cai Dongdong Shi |
| author_sort | Ke Shi |
| collection | DOAJ |
| description | We present narrowband imaging of a spectroscopically confirmed protocluster “D4UD01” at z = 3.24 using CFHT/WIRCam. We identify a sample of 24 [O iii ] emission-line galaxies in the field, which forms a large overdensity in the protocluster region. The protocluster is expected to evolve into a Virgo-like cluster by z = 0. Utilizing multiwavelength data, we derive the physical properties of these [O iii ] emitters and find that they are intermediate-mass normal star-forming galaxies (∼10 ^10 M _⊙ ) roughly following the star-forming main sequence. The [O iii ] emitters trace an overdensity spatially offset from that of photometric-redshift and quiescent galaxies, suggesting that these distinct galaxy populations may inhabit dark matter halos that formed at different epochs. A comparative analysis of [O iii ]-emitter properties shows similar characteristics in both protocluster and field environments. This protocluster likely represents an evolved structure that has progressed beyond its peak star formation phase, although our limited sample size may prevent detection of subtle environmental effects. |
| format | Article |
| id | doaj-art-47b9b033db094dccb18ad96327c68b18 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-47b9b033db094dccb18ad96327c68b182025-08-20T01:52:38ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01985216010.3847/1538-4357/adce72Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting GalaxiesKe Shi0https://orcid.org/0000-0003-4747-9656Jun Toshikawa1https://orcid.org/0000-0001-5394-242XXianzhong Zheng2https://orcid.org/0000-0003-3728-9912Zheng Cai3https://orcid.org/0000-0001-8467-6478Dongdong Shi4https://orcid.org/0000-0002-3264-819XSchool of Physical Science and Technology, Southwest University , Chongqing 400715, People’s Republic of China ; shike.astroph@gmail.comNishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo , 407-2 Nishigaichi, Sayo-cho, Sayo, Hyogo 679-5313, JapanTsung-Dao Lee Institute and Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Shanghai Jiao Tong University , Shanghai, 201210, People’s Republic of ChinaDepartment of Astronomy, Tsinghua University , Beijing 100084, People’s Republic of ChinaCenter for Fundamental Physics, School of Mechanics & Optoelectronic Physics, Anhui University of Science & Technology , Huainan 232001, People’s Republic of ChinaWe present narrowband imaging of a spectroscopically confirmed protocluster “D4UD01” at z = 3.24 using CFHT/WIRCam. We identify a sample of 24 [O iii ] emission-line galaxies in the field, which forms a large overdensity in the protocluster region. The protocluster is expected to evolve into a Virgo-like cluster by z = 0. Utilizing multiwavelength data, we derive the physical properties of these [O iii ] emitters and find that they are intermediate-mass normal star-forming galaxies (∼10 ^10 M _⊙ ) roughly following the star-forming main sequence. The [O iii ] emitters trace an overdensity spatially offset from that of photometric-redshift and quiescent galaxies, suggesting that these distinct galaxy populations may inhabit dark matter halos that formed at different epochs. A comparative analysis of [O iii ]-emitter properties shows similar characteristics in both protocluster and field environments. This protocluster likely represents an evolved structure that has progressed beyond its peak star formation phase, although our limited sample size may prevent detection of subtle environmental effects.https://doi.org/10.3847/1538-4357/adce72Protoclusters |
| spellingShingle | Ke Shi Jun Toshikawa Xianzhong Zheng Zheng Cai Dongdong Shi Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies The Astrophysical Journal Protoclusters |
| title | Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies |
| title_full | Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies |
| title_fullStr | Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies |
| title_full_unstemmed | Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies |
| title_short | Narrowband Imaging of a z = 3.24 Protocluster: Insights from [O iii]-emitting Galaxies |
| title_sort | narrowband imaging of a z 3 24 protocluster insights from o iii emitting galaxies |
| topic | Protoclusters |
| url | https://doi.org/10.3847/1538-4357/adce72 |
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