[CII] line emission in BRI 1335-0417 at z = 4.4*

Author： Wagg J. Carilli C. L. Wilner D. J. Cox P. De Breuck C. Menten K. Riechers D. A. Walter F.

E-ISSN： 1432-0746|519|issue|L1-L1

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.519, Iss.issue, 2010-09, pp. : L1-L1

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Abstract

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 $L_{\odot}$, 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 L_FIR = 3.1 × 10¹³ $L_{\odot}$, 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.