A nuclear spiral in a dusty star-forming galaxy at $z=2.78$
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866915125089271808 |
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| author | Stacey, H. R. Kaasinen, M. O'Riordan, C. M. McKean, J. P. Powell, D. M. Rizzo, F. |
| author_facet | Stacey, H. R. Kaasinen, M. O'Riordan, C. M. McKean, J. P. Powell, D. M. Rizzo, F. |
| contents | The nuclear structure of dusty star-forming galaxies is largely unexplored but harbours critical information about their structural evolution. Here, we present long-baseline Atacama Large (sub-)Millimetre Array (ALMA) continuum observations of a gravitationally lensed dusty star-forming galaxy at $z=2.78$. We use a pixellated lens modelling analysis to reconstruct the rest-frame 230 $\rmμ$m dust emission with a mean resolution of $\approx55$ pc and demonstrate that the inferred source properties are robust to changes in lens modelling methodology. The central 1 kpc is characterised by an exponential profile, a dual spiral arm morphology and an apparent super-Eddington compact central starburst. We find tentative evidence for a nuclear bar in the central 300 pc. These features may indicate that secular dynamical processes play a role in accumulating a high concentration of cold gas that fuels the rapid formation of a compact stellar spheroid and black hole accretion. We propose that the high spatial resolution provided by long-baseline ALMA observations and strong gravitational lensing will give key insights into the formation mechanisms of massive galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03644 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A nuclear spiral in a dusty star-forming galaxy at $z=2.78$ Stacey, H. R. Kaasinen, M. O'Riordan, C. M. McKean, J. P. Powell, D. M. Rizzo, F. Astrophysics of Galaxies The nuclear structure of dusty star-forming galaxies is largely unexplored but harbours critical information about their structural evolution. Here, we present long-baseline Atacama Large (sub-)Millimetre Array (ALMA) continuum observations of a gravitationally lensed dusty star-forming galaxy at $z=2.78$. We use a pixellated lens modelling analysis to reconstruct the rest-frame 230 $\rmμ$m dust emission with a mean resolution of $\approx55$ pc and demonstrate that the inferred source properties are robust to changes in lens modelling methodology. The central 1 kpc is characterised by an exponential profile, a dual spiral arm morphology and an apparent super-Eddington compact central starburst. We find tentative evidence for a nuclear bar in the central 300 pc. These features may indicate that secular dynamical processes play a role in accumulating a high concentration of cold gas that fuels the rapid formation of a compact stellar spheroid and black hole accretion. We propose that the high spatial resolution provided by long-baseline ALMA observations and strong gravitational lensing will give key insights into the formation mechanisms of massive galaxies. |
| title | A nuclear spiral in a dusty star-forming galaxy at $z=2.78$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.03644 |