Evidence for environmental effects in the $z\,{=}\,4.3$ protocluster core SPT2349$-$56
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909598481383424 |
|---|---|
| author | Hughes, Chayce Hill, Ryley Chapman, Scott Aravena, Manuel Archipley, Melanie Dike, Veronica J. Gonzalez, Anthony Greve, Thomas R. Gururajan, Gayathri Hayward, Chris Phadke, Kedar Reuter, Cassie Spilker, Justin Sulzenauer, Nikolaus Vieira, Joaquin D. Vizgan, David Wang, George Weiss, Axel Zhou, Dazhi |
| author_facet | Hughes, Chayce Hill, Ryley Chapman, Scott Aravena, Manuel Archipley, Melanie Dike, Veronica J. Gonzalez, Anthony Greve, Thomas R. Gururajan, Gayathri Hayward, Chris Phadke, Kedar Reuter, Cassie Spilker, Justin Sulzenauer, Nikolaus Vieira, Joaquin D. Vizgan, David Wang, George Weiss, Axel Zhou, Dazhi |
| contents | We present ALMA observations of the [CI] 492 and 806$\,$GHz fine-structure lines in 25 dusty star-forming galaxies (DSFGs) at $z\,{=}\,4.3$ in the core of the SPT2349$-$56 protocluster. The protocluster galaxies exhibit a median $L^\prime_{[\text{CI}](2-1)}/L^\prime_{[\text{CI}](1-0)}$ ratio of 0.94 with an interquartile range of 0.81-1.24. These ratios are markedly different to those observed in DSFGs in the field (across a comparable redshift and 850$\,μ$m flux density range), where the median is 0.55 with an interquartile range of 0.50-0.76, and we show that this difference is driven by an excess of [CI](2-1) in the protocluster galaxies for a given 850$\,μ$m flux density. Assuming local thermal equilibrium, we estimate gas excitation temperatures of $T_{\rm ex}\,{=}\,59.1^{+8.1}_{-6.8}\,$K for our protocluster sample and $T_{\rm ex}\,{=}\,33.9^{+2.4}_{-2.2}\,$K for the field sample. Our main interpretation of this result is that the protocluster galaxies have had their cold gas driven to their cores via close-by interactions within the dense environment, leading to an overall increase in the average gas density and excitation temperature, and an elevated [CI](2-1) luminosity-to-far-infrared luminosity ratio. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03790 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Evidence for environmental effects in the $z\,{=}\,4.3$ protocluster core SPT2349$-$56 Hughes, Chayce Hill, Ryley Chapman, Scott Aravena, Manuel Archipley, Melanie Dike, Veronica J. Gonzalez, Anthony Greve, Thomas R. Gururajan, Gayathri Hayward, Chris Phadke, Kedar Reuter, Cassie Spilker, Justin Sulzenauer, Nikolaus Vieira, Joaquin D. Vizgan, David Wang, George Weiss, Axel Zhou, Dazhi Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present ALMA observations of the [CI] 492 and 806$\,$GHz fine-structure lines in 25 dusty star-forming galaxies (DSFGs) at $z\,{=}\,4.3$ in the core of the SPT2349$-$56 protocluster. The protocluster galaxies exhibit a median $L^\prime_{[\text{CI}](2-1)}/L^\prime_{[\text{CI}](1-0)}$ ratio of 0.94 with an interquartile range of 0.81-1.24. These ratios are markedly different to those observed in DSFGs in the field (across a comparable redshift and 850$\,μ$m flux density range), where the median is 0.55 with an interquartile range of 0.50-0.76, and we show that this difference is driven by an excess of [CI](2-1) in the protocluster galaxies for a given 850$\,μ$m flux density. Assuming local thermal equilibrium, we estimate gas excitation temperatures of $T_{\rm ex}\,{=}\,59.1^{+8.1}_{-6.8}\,$K for our protocluster sample and $T_{\rm ex}\,{=}\,33.9^{+2.4}_{-2.2}\,$K for the field sample. Our main interpretation of this result is that the protocluster galaxies have had their cold gas driven to their cores via close-by interactions within the dense environment, leading to an overall increase in the average gas density and excitation temperature, and an elevated [CI](2-1) luminosity-to-far-infrared luminosity ratio. |
| title | Evidence for environmental effects in the $z\,{=}\,4.3$ protocluster core SPT2349$-$56 |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2412.03790 |