Volume 428, Number 3, December IV 2004
|Page(s)||L21 - L24|
|Published online||07 December 2004|
Letter to the Editor
Atomic carbon in PSS 2322+1944, a quasar at redshift *
IRAM, 300 rue de la Piscine, 38406 St-Martin-d'Hères, France e-mail: firstname.lastname@example.org
2 LERMA, Observatoire de Paris, 75014 Paris, France
3 Institut d'Astrophysique Spatiale, Université de Paris Sud, 91405 Orsay Cedex, France
4 Institut d'Astrophysique de Paris, CNRS and Université de Paris VI, 98bis Bd. Arago, 75014 Paris, France
5 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
6 National Radio Astronomy Observatory, PO Box, Socorro, NM 87801, USA
Accepted: 30 October 2004
We report the detection of the fine-structure line of neutral carbon in the quasar PSS 2322+1944, obtained at the IRAM Plateau de Bure interferometer. The [Ci] line is detected with a signal-to-noise ratio of ~6 with a peak intensity of ≈2.5 mJy and a velocity-integrated line flux of . Assuming an excitation temperature of 43 K (equal to the dust temperature), we derive a mass of neutral carbon (corrected for magnification) of . In PSS 2322+1944, the cooling due to C is about 6 times smaller than for CO, whereas the CO and C cooling represents ≈10-4 of the far-infrared continuum and more than half of the cooling due to C+.
Key words: galaxies: formation / galaxies: starburst / galaxies: high-redshift / quasars: emission lines / quasars: individual: PSS 2322+1944 / cosmology: observations
© ESO, 2004
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