Research output: Contribution to journal › Article › peer-review
- Carlos De Breuck
- Rebecca J. Williams
- Mark Swinbank
- Paola Caselli
- Kristen Coppin
- Timothy A. Davis
- Roberto Maiolino
- Tohru Nagao
- Ian Smail
- Fabian Walter
- Axel Weiss
- Martin Zwaan
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Original language | English |
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Article number | A59 |
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Number of pages | 10 |
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Journal | Astronomy & Astrophysics |
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Volume | 565 |
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Early online date | 12 May 2014 |
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DOIs | |
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Publication status | Published - 31 May 2014 |
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Abstract
We present spatially resolved Atacama Large Millimeter/submillimeter Array (ALMA) [CII] observations of the z=4.7555 submillimetre galaxy, ALESS 73.1. Our 0.5" FWHM map resolves the [CII] emitting gas which is centred close to the active galactic nucleus (AGN). The gas kinematics are dominated by rotation but with high turbulence, v_rot/sigma_int~3.1, and a Toomre Q parameter alpha_CO ~0.4. The diameter of the dust continuum emission is 80 Gyr^{-1}, especially since there are no clear indications of recent merger activity. Finally, our high signal-to-noise [CII] measurement revises the observed [NII]/[CII] ratio, which suggests a close to solar metallicity, unless the [CII] flux contains significant contributions from HII regions. Our observations suggest that ALESS73.1 is a nascent galaxy undergoing its first major burst of star formation, embedded within an unstable but metal-rich gas disk.
Notes
Reproduced with permission from Astronomy & Astrophysics, © ESO 2014.
ID: 10180432