Spectroscopic Confirmation of a Massive Protocluster with Two Substructures at $z \simeq 3.1$
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| Format: | Preprint |
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2024
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| _version_ | 1866915015105183744 |
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| author | Rosenthal, Michael J. Nicandro Barger, Amy J. Cowie, Lennox L. Jones, Logan H. McKay, Stephen J. Taylor, Anthony J. |
| author_facet | Rosenthal, Michael J. Nicandro Barger, Amy J. Cowie, Lennox L. Jones, Logan H. McKay, Stephen J. Taylor, Anthony J. |
| contents | We present the results of a Keck and NOEMA spectroscopic survey of 507 galaxies, where we confirm the presence of two massive overdensities at $z = 3.090 - 3.110$ and $z = 3.133 - 3.155$ in the neighborhood of the GOODS-N, each with over a dozen spectroscopically confirmed members. We find that both of these have galaxy overdensities of NIR-detected galaxies of $δ_{\rm gal, obs} = 6 - 9$ within corrected volumes of $(6 - 7) \times 10^3~{\rm cMpc}^3$. We estimate the properties of the $z = 0$ descendants of these overdensities using a spherical collapse model and find that both should virialize by $z \simeq 0.5 - 0.8$, with total masses of $M_{\rm tot} \simeq (6 - 7) \times 10^{14}~{\rm M}_\odot$. The same spherical collapse calculations, as well as a clustering-of-clusters statistical analysis, suggest a >80% likelihood that the two overdensities will collapse into a single cluster with $M_{\rm tot} = (1.0 - 1.5) \times 10^{15}~{\rm M}_\odot$ by $z \sim 0.1-0.4$. The $z = 3.14$ substructure contains a core of four bright dusty star-forming galaxies with $Σ{\rm SFR} = 2700 \pm 700~{\rm M}_\odot~{\rm yr}^{-1}$ in a volume of only 280 ${\rm cMpc}^3$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_07291 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spectroscopic Confirmation of a Massive Protocluster with Two Substructures at $z \simeq 3.1$ Rosenthal, Michael J. Nicandro Barger, Amy J. Cowie, Lennox L. Jones, Logan H. McKay, Stephen J. Taylor, Anthony J. Astrophysics of Galaxies We present the results of a Keck and NOEMA spectroscopic survey of 507 galaxies, where we confirm the presence of two massive overdensities at $z = 3.090 - 3.110$ and $z = 3.133 - 3.155$ in the neighborhood of the GOODS-N, each with over a dozen spectroscopically confirmed members. We find that both of these have galaxy overdensities of NIR-detected galaxies of $δ_{\rm gal, obs} = 6 - 9$ within corrected volumes of $(6 - 7) \times 10^3~{\rm cMpc}^3$. We estimate the properties of the $z = 0$ descendants of these overdensities using a spherical collapse model and find that both should virialize by $z \simeq 0.5 - 0.8$, with total masses of $M_{\rm tot} \simeq (6 - 7) \times 10^{14}~{\rm M}_\odot$. The same spherical collapse calculations, as well as a clustering-of-clusters statistical analysis, suggest a >80% likelihood that the two overdensities will collapse into a single cluster with $M_{\rm tot} = (1.0 - 1.5) \times 10^{15}~{\rm M}_\odot$ by $z \sim 0.1-0.4$. The $z = 3.14$ substructure contains a core of four bright dusty star-forming galaxies with $Σ{\rm SFR} = 2700 \pm 700~{\rm M}_\odot~{\rm yr}^{-1}$ in a volume of only 280 ${\rm cMpc}^3$. |
| title | Spectroscopic Confirmation of a Massive Protocluster with Two Substructures at $z \simeq 3.1$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.07291 |