The eventful life of a luminous galaxy at z = 14: metal enrichment, feedback, and low gas fraction?
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2024
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866916677572100096 |
|---|---|
| author | Carniani, Stefano D'Eugenio, Francesco Ji, Xihan Parlanti, Eleonora Scholtz, Jan Sun, Fengwu Venturi, Giacomo Bakx, Tom J. L. C. Curti, Mirko Maiolino, Roberto Tacchella, Sandro Zavala, Jorge A. Hainline, Kevin Witstok, Joris Johnson, Benjamin D. Alberts, Stacey Bunker, Andrew J. Charlot, Stéphane Eisenstein, Daniel J. Helton, Jakob M. Jakobsen, Peter Kumari, Nimisha Robertson, Brant Saxena, Aayush Übler, Hannah Williams, Christina C. Willmer, Christopher N. A. Willott, Chris |
| author_facet | Carniani, Stefano D'Eugenio, Francesco Ji, Xihan Parlanti, Eleonora Scholtz, Jan Sun, Fengwu Venturi, Giacomo Bakx, Tom J. L. C. Curti, Mirko Maiolino, Roberto Tacchella, Sandro Zavala, Jorge A. Hainline, Kevin Witstok, Joris Johnson, Benjamin D. Alberts, Stacey Bunker, Andrew J. Charlot, Stéphane Eisenstein, Daniel J. Helton, Jakob M. Jakobsen, Peter Kumari, Nimisha Robertson, Brant Saxena, Aayush Übler, Hannah Williams, Christina C. Willmer, Christopher N. A. Willott, Chris |
| contents | JADES-GS-z14-0 is the most distant spectroscopically confirmed galaxy yet, at $z>14$. With a UV magnitude of -20.81, it is one of the most luminous galaxies at cosmic dawn and its half-light radius of 260 pc means that stars dominate the observed UV emission. We report ALMA detection of [OIII]88$μ$m line emission with a significance of 6.67$σ$ and at a frequency of 223.524~GHz, corresponding to a redshift of $14.1796\pm0.0007$, which is consistent with the candidate CIII] line detected in the NIRSpec spectrum. At this spectroscopic redshift, the Lyman-$α$ break identified with NIRSpec requires a damped Lyman-$α$ absorber with a column density of $\log(N_{\rm HI}/\mathrm{cm}^{-2})=21.96$. The total [O\,{\sc iii}]88$μ$m luminosity (log$(L_{\rm [OIII]}/L_\odot) = 8.3\pm 0.1$) is fully consistent with the local $L_{\rm [OIII]}-SFR$ relation and indicating a gas-phase metallicity $>0.1~{\rm Z_{\rm \odot}}$. Using \texttt{prospector} SED modeling and combining the ALMA data with JWST observations, we find $Z=0.17~{\rm Z_{\rm \odot}}$ and a non-zero escape fraction of ionizing photons ($\sim11\%$), which is necessary by the code to reproduce the UV spectrum. We measure an ${\rm [O III]}5007$Å/[O III]88$μ$m line flux ratio between 1 and 20, resulting in an upper limit to the electron density of roughly 700 cm$^{-3}$ assuming a single-cloud photoionization model. The [OIIII]88$μ$m emission line is spectrally resolved, with a FWHM of 100 km/s, resulting in a dynamical mass of log($M_{\rm dyn}/M_\odot$) = 9.0$\pm0.2$. When compared to the stellar mass, this value represents a conservative upper limit on the gas mass fraction, which ranges from 50\% to 80\%, depending on the assumed star formation history. Past radiation-driven outflows may have cleared the galaxy from the gas, reducing the gas fraction and thus increasing the escape fraction of ionizing photons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_20533 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The eventful life of a luminous galaxy at z = 14: metal enrichment, feedback, and low gas fraction? Carniani, Stefano D'Eugenio, Francesco Ji, Xihan Parlanti, Eleonora Scholtz, Jan Sun, Fengwu Venturi, Giacomo Bakx, Tom J. L. C. Curti, Mirko Maiolino, Roberto Tacchella, Sandro Zavala, Jorge A. Hainline, Kevin Witstok, Joris Johnson, Benjamin D. Alberts, Stacey Bunker, Andrew J. Charlot, Stéphane Eisenstein, Daniel J. Helton, Jakob M. Jakobsen, Peter Kumari, Nimisha Robertson, Brant Saxena, Aayush Übler, Hannah Williams, Christina C. Willmer, Christopher N. A. Willott, Chris Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics JADES-GS-z14-0 is the most distant spectroscopically confirmed galaxy yet, at $z>14$. With a UV magnitude of -20.81, it is one of the most luminous galaxies at cosmic dawn and its half-light radius of 260 pc means that stars dominate the observed UV emission. We report ALMA detection of [OIII]88$μ$m line emission with a significance of 6.67$σ$ and at a frequency of 223.524~GHz, corresponding to a redshift of $14.1796\pm0.0007$, which is consistent with the candidate CIII] line detected in the NIRSpec spectrum. At this spectroscopic redshift, the Lyman-$α$ break identified with NIRSpec requires a damped Lyman-$α$ absorber with a column density of $\log(N_{\rm HI}/\mathrm{cm}^{-2})=21.96$. The total [O\,{\sc iii}]88$μ$m luminosity (log$(L_{\rm [OIII]}/L_\odot) = 8.3\pm 0.1$) is fully consistent with the local $L_{\rm [OIII]}-SFR$ relation and indicating a gas-phase metallicity $>0.1~{\rm Z_{\rm \odot}}$. Using \texttt{prospector} SED modeling and combining the ALMA data with JWST observations, we find $Z=0.17~{\rm Z_{\rm \odot}}$ and a non-zero escape fraction of ionizing photons ($\sim11\%$), which is necessary by the code to reproduce the UV spectrum. We measure an ${\rm [O III]}5007$Å/[O III]88$μ$m line flux ratio between 1 and 20, resulting in an upper limit to the electron density of roughly 700 cm$^{-3}$ assuming a single-cloud photoionization model. The [OIIII]88$μ$m emission line is spectrally resolved, with a FWHM of 100 km/s, resulting in a dynamical mass of log($M_{\rm dyn}/M_\odot$) = 9.0$\pm0.2$. When compared to the stellar mass, this value represents a conservative upper limit on the gas mass fraction, which ranges from 50\% to 80\%, depending on the assumed star formation history. Past radiation-driven outflows may have cleared the galaxy from the gas, reducing the gas fraction and thus increasing the escape fraction of ionizing photons. |
| title | The eventful life of a luminous galaxy at z = 14: metal enrichment, feedback, and low gas fraction? |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2409.20533 |