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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2405.12955 |
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| _version_ | 1866915314328928256 |
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| author | Jones, Gareth C. Bunker, Andrew J. Telikova, Kseniia Arribas, Santiago Carniani, Stefano Charlot, Stephane D'Eugenio, Francesco Maiolino, Roberto Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris Aravena, Manuel Böker, Torsten Cresci, Giovanni Curti, Mirko González-López, Jorge Herrera-Camus, Rodrigo Lamperti, Isabella Parlanti, Eleonora Perez-Gonzalez, Pablo G. Villanueva, Vicente |
| author_facet | Jones, Gareth C. Bunker, Andrew J. Telikova, Kseniia Arribas, Santiago Carniani, Stefano Charlot, Stephane D'Eugenio, Francesco Maiolino, Roberto Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris Aravena, Manuel Böker, Torsten Cresci, Giovanni Curti, Mirko González-López, Jorge Herrera-Camus, Rodrigo Lamperti, Isabella Parlanti, Eleonora Perez-Gonzalez, Pablo G. Villanueva, Vicente |
| contents | We present observations of the $z\sim5.7$ Lyman-break galaxy HZ10 with the JWST/NIRSpec IFU in high and low spectral resolution (G395H, spectral resolving power $R\sim2700$ and PRISM, $R\sim100$, respectively), as part of the GA-NIFS program. By spatially resolving the source (spatial resolution $\sim0.15''$ or $\sim0.9$kpc), we find three spatially and spectrally distinct regions of line emission along with one region of strong continuum emission, all within a projected distance of $<10$kpc. The R2700 data features strong detections in H$β$, [OIII]$λ\lambda4959{,}5007$, [NII]$λ\lambda6548{,}6584$, H$α$, and [SII]$λ\lambda6716{,}6731$. The R100 data additionally contains a strong detection of the Ly$α$ break, rest-frame UV and optical continuum, and [OII]$λ\lambda3726{,}3729$. None of the detected lines present strong evidence for AGN excitation from line diagnostic diagrams, and no high-ionisation lines are detected. Using the detected lines, we constrain the electron density $\left( \rm \log_{10}\left( n_e / cm^{-3}\right)\sim 3\right)$ and metallicity ($\sim0.5-0.7$ solar) in each component. Spaxel-by-spaxel fits reveal a strong east-west velocity gradient and significant line asymmetries (possibly indicating tidal features or outflows). The western component features a very red UV slope ($β_{\rm UV}\sim-0.9$) and significant H$α$ emission, suggesting an evolved population and active star formation. A comparison to high resolution ($\sim0.3''$ or $\sim1.8$kpc) [CII]$158μ$m imaging obtained with the Atacama Large Millimetre/submillimetre Array (ALMA) reveals areas of dust obscuration. Altogether, these data suggest that HZ10 represents an ongoing merger, with a complex distribution of stars, gas, and dust $<1$Gyr after the Big Bang. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_12955 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GA-NIFS: Witnessing the complex assembly of a star-forming system at $z=5.7$ Jones, Gareth C. Bunker, Andrew J. Telikova, Kseniia Arribas, Santiago Carniani, Stefano Charlot, Stephane D'Eugenio, Francesco Maiolino, Roberto Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris Aravena, Manuel Böker, Torsten Cresci, Giovanni Curti, Mirko González-López, Jorge Herrera-Camus, Rodrigo Lamperti, Isabella Parlanti, Eleonora Perez-Gonzalez, Pablo G. Villanueva, Vicente Astrophysics of Galaxies We present observations of the $z\sim5.7$ Lyman-break galaxy HZ10 with the JWST/NIRSpec IFU in high and low spectral resolution (G395H, spectral resolving power $R\sim2700$ and PRISM, $R\sim100$, respectively), as part of the GA-NIFS program. By spatially resolving the source (spatial resolution $\sim0.15''$ or $\sim0.9$kpc), we find three spatially and spectrally distinct regions of line emission along with one region of strong continuum emission, all within a projected distance of $<10$kpc. The R2700 data features strong detections in H$β$, [OIII]$λ\lambda4959{,}5007$, [NII]$λ\lambda6548{,}6584$, H$α$, and [SII]$λ\lambda6716{,}6731$. The R100 data additionally contains a strong detection of the Ly$α$ break, rest-frame UV and optical continuum, and [OII]$λ\lambda3726{,}3729$. None of the detected lines present strong evidence for AGN excitation from line diagnostic diagrams, and no high-ionisation lines are detected. Using the detected lines, we constrain the electron density $\left( \rm \log_{10}\left( n_e / cm^{-3}\right)\sim 3\right)$ and metallicity ($\sim0.5-0.7$ solar) in each component. Spaxel-by-spaxel fits reveal a strong east-west velocity gradient and significant line asymmetries (possibly indicating tidal features or outflows). The western component features a very red UV slope ($β_{\rm UV}\sim-0.9$) and significant H$α$ emission, suggesting an evolved population and active star formation. A comparison to high resolution ($\sim0.3''$ or $\sim1.8$kpc) [CII]$158μ$m imaging obtained with the Atacama Large Millimetre/submillimetre Array (ALMA) reveals areas of dust obscuration. Altogether, these data suggest that HZ10 represents an ongoing merger, with a complex distribution of stars, gas, and dust $<1$Gyr after the Big Bang. |
| title | GA-NIFS: Witnessing the complex assembly of a star-forming system at $z=5.7$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2405.12955 |