University of Hertfordshire

From the same journal

From the same journal

By the same authors

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

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Documents

  • 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 languageEnglish
Article numberA59
Number of pages10
JournalAstronomy & Astrophysics
Volume565
Early online date12 May 2014
DOIs
Publication statusPublished - 31 May 2014

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.

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