JADES + JEMS: A Detailed Look at the Buildup of Central Stellar Cores and Suppression of Star Formation in Galaxies at Redshifts 3 < z < 4.5
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2023
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913539270115328 |
|---|---|
| author | Ji, Zhiyuan Williams, Christina C. Tacchella, Sandro Suess, Katherine A. Baker, William M. Alberts, Stacey Bunker, Andrew J. Johnson, Benjamin D. Robertson, Brant Sun, Fengwu Eisenstein, Daniel J. Rieke, Marcia Maseda, Michael V. Hainline, Kevin Hausen, Ryan Rieke, George Willmer, Christopher N. A. Egami, Eiichi Shivaei, Irene Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curtis-Lake, Emma Looser, Tobias J. Maiolino, Roberto Willott, Chris Chen, Zuyi Helton, Jakob M. Lyu, Jianwei Nelson, Erica Bhatawdekar, Rachana Boyett, Kristan Sandles, Lester |
| author_facet | Ji, Zhiyuan Williams, Christina C. Tacchella, Sandro Suess, Katherine A. Baker, William M. Alberts, Stacey Bunker, Andrew J. Johnson, Benjamin D. Robertson, Brant Sun, Fengwu Eisenstein, Daniel J. Rieke, Marcia Maseda, Michael V. Hainline, Kevin Hausen, Ryan Rieke, George Willmer, Christopher N. A. Egami, Eiichi Shivaei, Irene Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curtis-Lake, Emma Looser, Tobias J. Maiolino, Roberto Willott, Chris Chen, Zuyi Helton, Jakob M. Lyu, Jianwei Nelson, Erica Bhatawdekar, Rachana Boyett, Kristan Sandles, Lester |
| contents | We present a spatially resolved study of stellar populations in 6 galaxies with stellar masses $M_*\sim10^{10}M_\odot$ at $z\sim3.7$ using 14-filter JWST/NIRCam imaging from the JADES and JEMS surveys. The 6 galaxies are visually selected to have clumpy substructures with distinct colors over rest-frame $3600-4100Å$, including a red, dominant stellar core that is close to their stellar-light centroids. With 23-filter photometry from HST to JWST, we measure the stellar-population properties of individual structural components via SED fitting using Prospector. We find that the central stellar cores are $\gtrsim2$ times more massive than the Toomre mass, indicating they may not form via single in-situ fragmentation. The stellar cores have stellar ages of $0.4-0.7$ Gyr that are similar to the timescale of clump inward migration due to dynamical friction, suggesting that they likely instead formed through the coalescence of giant stellar clumps. While they have not yet quenched, the 6 galaxies are below the star-forming main sequence by $0.2-0.7$ dex. Within each galaxy, we find that the specific star formation rate is lower in the central stellar core, and the stellar-mass surface density of the core is already similar to quenched galaxies of the same masses and redshifts. Meanwhile, the stellar ages of the cores are either comparable to or younger than the extended, smooth parts of the galaxies. Our findings are consistent with model predictions of the gas-rich compaction scenario for the buildup of galaxies' central regions at high redshifts. We are likely witnessing the coeval formation of dense central cores, along with the onset of galaxy-wide quenching at $z>3$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_18518 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | JADES + JEMS: A Detailed Look at the Buildup of Central Stellar Cores and Suppression of Star Formation in Galaxies at Redshifts 3 < z < 4.5 Ji, Zhiyuan Williams, Christina C. Tacchella, Sandro Suess, Katherine A. Baker, William M. Alberts, Stacey Bunker, Andrew J. Johnson, Benjamin D. Robertson, Brant Sun, Fengwu Eisenstein, Daniel J. Rieke, Marcia Maseda, Michael V. Hainline, Kevin Hausen, Ryan Rieke, George Willmer, Christopher N. A. Egami, Eiichi Shivaei, Irene Carniani, Stefano Charlot, Stephane Chevallard, Jacopo Curtis-Lake, Emma Looser, Tobias J. Maiolino, Roberto Willott, Chris Chen, Zuyi Helton, Jakob M. Lyu, Jianwei Nelson, Erica Bhatawdekar, Rachana Boyett, Kristan Sandles, Lester Astrophysics of Galaxies We present a spatially resolved study of stellar populations in 6 galaxies with stellar masses $M_*\sim10^{10}M_\odot$ at $z\sim3.7$ using 14-filter JWST/NIRCam imaging from the JADES and JEMS surveys. The 6 galaxies are visually selected to have clumpy substructures with distinct colors over rest-frame $3600-4100Å$, including a red, dominant stellar core that is close to their stellar-light centroids. With 23-filter photometry from HST to JWST, we measure the stellar-population properties of individual structural components via SED fitting using Prospector. We find that the central stellar cores are $\gtrsim2$ times more massive than the Toomre mass, indicating they may not form via single in-situ fragmentation. The stellar cores have stellar ages of $0.4-0.7$ Gyr that are similar to the timescale of clump inward migration due to dynamical friction, suggesting that they likely instead formed through the coalescence of giant stellar clumps. While they have not yet quenched, the 6 galaxies are below the star-forming main sequence by $0.2-0.7$ dex. Within each galaxy, we find that the specific star formation rate is lower in the central stellar core, and the stellar-mass surface density of the core is already similar to quenched galaxies of the same masses and redshifts. Meanwhile, the stellar ages of the cores are either comparable to or younger than the extended, smooth parts of the galaxies. Our findings are consistent with model predictions of the gas-rich compaction scenario for the buildup of galaxies' central regions at high redshifts. We are likely witnessing the coeval formation of dense central cores, along with the onset of galaxy-wide quenching at $z>3$. |
| title | JADES + JEMS: A Detailed Look at the Buildup of Central Stellar Cores and Suppression of Star Formation in Galaxies at Redshifts 3 < z < 4.5 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2305.18518 |