ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8

Breuck, Carlos De, Williams, Rebecca J., Swinbank, Mark, Caselli, Paola, Coppin, Kristen, Davis, Timothy A., Maiolino, Roberto, Nagao, Tohru, Smail, Ian, Walter, Fabian, Weiss, Axel and Zwaan, Martin (2014) ALMA resolves turbulent, rotating [CII] emission in a young starburst galaxy at z=4.8. Astronomy & Astrophysics, 565: A59. ISSN 0004-6361
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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.

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