Narrowband Imaging of a z=3.24 Protocluster: Insights from [O III] Emitting Galaxies
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arXiv
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| Format: | Preprint |
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2025
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| author | Shi, Ke Toshikawa, Jun Zheng, XianZhong Cai, Zheng Shi, DongDong |
| author_facet | Shi, Ke Toshikawa, Jun Zheng, XianZhong Cai, Zheng Shi, DongDong |
| contents | We present a narrowband imaging on 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 they are medium mass normal star-forming galaxies ($\sim10^{10}$M$_\odot$) 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 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 | Preprint |
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arxiv_https___arxiv_org_abs_2504_12225 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Narrowband Imaging of a z=3.24 Protocluster: Insights from [O III] Emitting Galaxies Shi, Ke Toshikawa, Jun Zheng, XianZhong Cai, Zheng Shi, DongDong Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present a narrowband imaging on 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 they are medium mass normal star-forming galaxies ($\sim10^{10}$M$_\odot$) 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 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. |
| title | Narrowband Imaging of a z=3.24 Protocluster: Insights from [O III] Emitting Galaxies |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.12225 |