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Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 2(400), p. 670-676

DOI: 10.1111/j.1365-2966.2009.15517.x

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A search for neutral carbon towards twoz= 4.05 submillimetre galaxies, GN���20 and GN���20.2

Journal article published in 2009 by C. M. Casey ORCID, S. C. Chapman, E. Daddi ORCID, H. Dannerbauer, A. Pope, D. Scott, F. Bertoldi, R. J. Beswick, A. W. Blain, P. Cox, R. Genzel, T. R. Greve, R. J. Ivison, T. W. B. Muxlow, R. Neri and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Using the IRAM Plateau de Bure Interferometer (PdBI) we have searched for the upper fine structure line of neutral carbon [] and 12CO(J= 7 → 6) (νrest= 806 GHz) towards the submillimetre galaxies (SMGs) GN 20 (SMM J123711.9+622212, z= 4.055) and GN 20.2 (SMM J123708.8+622202, z= 4.051). The far-infrared continuum is detected at 8σ significance in GN 20, with a flux density of S1.8 mm= 1.9 ± 0.2 mJy, while no continuum is detected in GN 20.2. Both sources are statistically undetected in both and 12CO(J= 7 → 6) lines; we derive line luminosity limits for both C i and CO of L′≲ 2 × 1010 K km s−1 pc2. Assuming carbon excitation temperatures of Tex= 30 K (the galaxies' measured dust temperatures), we infer C i mass limits of MC i < 5.4 × 106 M⊙ (GN 20) and MC i < 6.8 × 106 M⊙ (GN 20.2). The derived C i abundance limits are