Volume 519, September 2010
|Number of page(s)||4|
|Published online||06 September 2010|
Letter to the Editor
[CII] line emission in BRI 1335-0417 at z = 4.4*
European Southern Observatory, Casilla 19001, Santiago, Chile e-mail: email@example.com
2 National Radio Astronomy Observatory, PO Box 0, Socorro, NM, 87801, USA
3 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
4 Institute de Radioastronomie Millimétrique, Saint-Martin-d'Hères, 38406, France
5 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748, Garching bei München, Germany
6 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 71, 53121 Bonn, Germany
7 California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
8 Max-Planck-Institute for Astronomy, Königsstuhl 17, 69117 Heidelberg, Germany
Accepted: 6 August 2010
Using the 12-m APEX telescope, we have detected redshifted emission from the 157.74 μm [CII] line in the z = 4.4074 quasar BRI 1335-0417. The linewidth and redshift are in good agreement with previous observations of high-J CO line emission. We measure a [CII] line luminosity, L[CII] = (16.4 ± 2.6) × 109 , making BRI 1335-0417 the most luminous, unlensed [CII] line emitter known at high-redshift. The [CII]-to-FIR luminosity ratio of (5.3 ± 0.8) × 10-4 is ~3× higher than expected for an average object with a FIR luminosity LFIR = 3.1 × 1013 , if this ratio were to follow the trend observed in other FIR-bright galaxies that have been detected in [CII] line emission. These new data suggest that the scatter in the [CII]-to-FIR luminosity ratio could be larger than previously expected for high luminosity objects. BR1335-0417 has a similar FIR luminosity and [CII]/CO luminosity compared to local ULIRGS and appears to be a gas-rich merger forming stars at a rate of a few thousand solar masses per year.
Key words: galaxies: high-redshift / galaxies: ISM
© ESO, 2010
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