Tentative rotation in a galaxy at z$\sim$14 with ALMA
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Scholtz, J. Parlanti, E. Carniani, S. Kohandel, M. Sun, F. Danhaive, A. L. Maiolino, R. Arribas, S. Bhatawdekar, R. Bunker, A. J. Charlot, S. D'Eugenio, F. Ferrara, A. Ji, Z. Jones, Gareth C. Rinaldi, P. Robertson, B. Pallottini, A. Shivaei, I. Sun, Y. Tacchella, S. Übler, H. Venturi, G. |
| author_facet | Scholtz, J. Parlanti, E. Carniani, S. Kohandel, M. Sun, F. Danhaive, A. L. Maiolino, R. Arribas, S. Bhatawdekar, R. Bunker, A. J. Charlot, S. D'Eugenio, F. Ferrara, A. Ji, Z. Jones, Gareth C. Rinaldi, P. Robertson, B. Pallottini, A. Shivaei, I. Sun, Y. Tacchella, S. Übler, H. Venturi, G. |
| contents | We re-analysed ALMA observations of the [OIII]$λ$88$μ$m emission line in JADES-GS-z14.0, so far the most distant spectroscopically confirmed galaxy at z=14.18. Our analysis shows a tentative detection of a velocity gradient of [OIII]$λ$88$μ$m using three independent tests: 1) construction of moment maps; 2) extraction of integrated spectra from a grid of apertures; and 3) spectro-astrometry in both the image and uv planes. We performed kinematical fitting using the KinMS code and estimated a dynamical mass of log$_{10}$(M$_{\rm dyn}$/$\rm M_\odot$)= 9.4$^{+0.8}_{-0.4}$, with the bulk of the uncertainties due to the degeneracy between dynamical mass and inclination. We measure an upper limit on the velocity dispersion ($σ_{v}$) of $<40~$ km/s~which results in an estimate of V$_{\rm rot}/σ>$ 2.5. This result, if confirmed with higher-resolution observations, would imply that kinematically cold discs are already in place at $z\sim14$. Comparison with mock observations from the SERRA cosmological simulations confirms that even low-resolution observations are capable of detecting a velocity gradient in $z>10$ galaxies as compact as JADES-GS-z14.0. This work shows that deeper ALMA or JWST/NIRSpec IFS observations with high spatial resolution will be able to estimate an accurate dynamical mass for JADES-GS-z14.0, providing an upper limit to the stellar mass of this over-luminous galaxy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_10751 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tentative rotation in a galaxy at z$\sim$14 with ALMA Scholtz, J. Parlanti, E. Carniani, S. Kohandel, M. Sun, F. Danhaive, A. L. Maiolino, R. Arribas, S. Bhatawdekar, R. Bunker, A. J. Charlot, S. D'Eugenio, F. Ferrara, A. Ji, Z. Jones, Gareth C. Rinaldi, P. Robertson, B. Pallottini, A. Shivaei, I. Sun, Y. Tacchella, S. Übler, H. Venturi, G. Astrophysics of Galaxies We re-analysed ALMA observations of the [OIII]$λ$88$μ$m emission line in JADES-GS-z14.0, so far the most distant spectroscopically confirmed galaxy at z=14.18. Our analysis shows a tentative detection of a velocity gradient of [OIII]$λ$88$μ$m using three independent tests: 1) construction of moment maps; 2) extraction of integrated spectra from a grid of apertures; and 3) spectro-astrometry in both the image and uv planes. We performed kinematical fitting using the KinMS code and estimated a dynamical mass of log$_{10}$(M$_{\rm dyn}$/$\rm M_\odot$)= 9.4$^{+0.8}_{-0.4}$, with the bulk of the uncertainties due to the degeneracy between dynamical mass and inclination. We measure an upper limit on the velocity dispersion ($σ_{v}$) of $<40~$ km/s~which results in an estimate of V$_{\rm rot}/σ>$ 2.5. This result, if confirmed with higher-resolution observations, would imply that kinematically cold discs are already in place at $z\sim14$. Comparison with mock observations from the SERRA cosmological simulations confirms that even low-resolution observations are capable of detecting a velocity gradient in $z>10$ galaxies as compact as JADES-GS-z14.0. This work shows that deeper ALMA or JWST/NIRSpec IFS observations with high spatial resolution will be able to estimate an accurate dynamical mass for JADES-GS-z14.0, providing an upper limit to the stellar mass of this over-luminous galaxy. |
| title | Tentative rotation in a galaxy at z$\sim$14 with ALMA |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.10751 |