The JWST Advanced Deep Extragalactic Survey: Discovery of an Extreme Galaxy Overdensity at $z = 5.4$ with JWST/NIRCam in GOODS-S
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| Format: | Preprint |
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2023
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| author | Helton, Jakob M. Sun, Fengwu Woodrum, Charity Hainline, Kevin N. Willmer, Christopher N. A. Rieke, George H. Rieke, Marcia J. Tacchella, Sandro Robertson, Brant Johnson, Benjamin D. Alberts, Stacey Eisenstein, Daniel J. Hausen, Ryan Bonaventura, Nina R. Bunker, Andrew Charlot, Stephane Curti, Mirko Curtis-Lake, Emma Looser, Tobias J. Maiolino, Roberto Willott, Chris Witstok, Joris Boyett, Kristan Chen, Zuyi Egami, Eiichi Endsley, Ryan Hviding, Raphael E. Jaffe, Daniel T. Ji, Zhiyuan Lyu, Jianwei Sandles, Lester |
| author_facet | Helton, Jakob M. Sun, Fengwu Woodrum, Charity Hainline, Kevin N. Willmer, Christopher N. A. Rieke, George H. Rieke, Marcia J. Tacchella, Sandro Robertson, Brant Johnson, Benjamin D. Alberts, Stacey Eisenstein, Daniel J. Hausen, Ryan Bonaventura, Nina R. Bunker, Andrew Charlot, Stephane Curti, Mirko Curtis-Lake, Emma Looser, Tobias J. Maiolino, Roberto Willott, Chris Witstok, Joris Boyett, Kristan Chen, Zuyi Egami, Eiichi Endsley, Ryan Hviding, Raphael E. Jaffe, Daniel T. Ji, Zhiyuan Lyu, Jianwei Sandles, Lester |
| contents | We report the discovery of an extreme galaxy overdensity at $z = 5.4$ in the GOODS-S field using JWST/NIRCam imaging from JADES and JEMS alongside JWST/NIRCam wide field slitless spectroscopy from FRESCO. We identified potential members of the overdensity using HST+JWST photometry spanning $λ= 0.4-5.0\ μ\mathrm{m}$. These data provide accurate and well-constrained photometric redshifts down to $m \approx 29-30\,\mathrm{mag}$. We subsequently confirmed $N = 81$ galaxies at $5.2 < z < 5.5$ using JWST slitless spectroscopy over $λ= 3.9-5.0\ μ\mathrm{m}$ through a targeted line search for $\mathrm{H} α$ around the best-fit photometric redshift. We verified that $N = 42$ of these galaxies reside in the field while $N = 39$ galaxies reside in a density around $\sim 10$ times that of a random volume. Stellar populations for these galaxies were inferred from the photometry and used to construct the star-forming main sequence, where protocluster members appeared more massive and exhibited earlier star formation (and thus older stellar populations) when compared to their field galaxy counterparts. We estimate the total halo mass of this large-scale structure to be $12.6 \lesssim \mathrm{log}_{10} \left( M_{\mathrm{halo}}/M_{\odot} \right) \lesssim 12.8$ using an empirical stellar mass to halo mass relation, which is likely an underestimate as a result of incompleteness. Our discovery demonstrates the power of JWST at constraining dark matter halo assembly and galaxy formation at very early cosmic times. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_10217 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The JWST Advanced Deep Extragalactic Survey: Discovery of an Extreme Galaxy Overdensity at $z = 5.4$ with JWST/NIRCam in GOODS-S Helton, Jakob M. Sun, Fengwu Woodrum, Charity Hainline, Kevin N. Willmer, Christopher N. A. Rieke, George H. Rieke, Marcia J. Tacchella, Sandro Robertson, Brant Johnson, Benjamin D. Alberts, Stacey Eisenstein, Daniel J. Hausen, Ryan Bonaventura, Nina R. Bunker, Andrew Charlot, Stephane Curti, Mirko Curtis-Lake, Emma Looser, Tobias J. Maiolino, Roberto Willott, Chris Witstok, Joris Boyett, Kristan Chen, Zuyi Egami, Eiichi Endsley, Ryan Hviding, Raphael E. Jaffe, Daniel T. Ji, Zhiyuan Lyu, Jianwei Sandles, Lester Astrophysics of Galaxies We report the discovery of an extreme galaxy overdensity at $z = 5.4$ in the GOODS-S field using JWST/NIRCam imaging from JADES and JEMS alongside JWST/NIRCam wide field slitless spectroscopy from FRESCO. We identified potential members of the overdensity using HST+JWST photometry spanning $λ= 0.4-5.0\ μ\mathrm{m}$. These data provide accurate and well-constrained photometric redshifts down to $m \approx 29-30\,\mathrm{mag}$. We subsequently confirmed $N = 81$ galaxies at $5.2 < z < 5.5$ using JWST slitless spectroscopy over $λ= 3.9-5.0\ μ\mathrm{m}$ through a targeted line search for $\mathrm{H} α$ around the best-fit photometric redshift. We verified that $N = 42$ of these galaxies reside in the field while $N = 39$ galaxies reside in a density around $\sim 10$ times that of a random volume. Stellar populations for these galaxies were inferred from the photometry and used to construct the star-forming main sequence, where protocluster members appeared more massive and exhibited earlier star formation (and thus older stellar populations) when compared to their field galaxy counterparts. We estimate the total halo mass of this large-scale structure to be $12.6 \lesssim \mathrm{log}_{10} \left( M_{\mathrm{halo}}/M_{\odot} \right) \lesssim 12.8$ using an empirical stellar mass to halo mass relation, which is likely an underestimate as a result of incompleteness. Our discovery demonstrates the power of JWST at constraining dark matter halo assembly and galaxy formation at very early cosmic times. |
| title | The JWST Advanced Deep Extragalactic Survey: Discovery of an Extreme Galaxy Overdensity at $z = 5.4$ with JWST/NIRCam in GOODS-S |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2302.10217 |