SIMBAD references

2010ApJ...709..210K - Astrophys. J., 709, 210-217 (2010/January-3)

Physical properties and morphology of a newly identified compact z = 4.04 lensed submillimeter galaxy in Abell 2218.


Abstract (from CDS):

We present the identification of a bright submillimeter (submm) source, SMM J163555.5+661300, detected in the lensing cluster Abell 2218, for which we have accurately determined the position using observations from the Submillimeter Array (SMA). The identified optical counterpart has a spectroscopic redshift of z = 4.044±0.001 if we attribute the single emission line detected at λ = 6140 Å to Lyα. This redshift identification is in good agreement with the optical/near-infrared photometric redshift as well as the submm flux ratio S450/S850∼ 1.6, the radio-submm flux ratio S1.4/S850 < 0.004, and the 24 µm to 850 µm flux ratio S24/S850< 0.005. Correcting for the gravitational lensing amplification of ∼5.5, we find that the source has a far-infrared luminosity of 1.3x1012 L, which implies a star formation rate (SFR) of 230 M/yr. This makes it the lowest-luminosity submillimeter galaxy (SMG) known at z>4 to date. Previous CO(4-3) emission line observations yielded a non-detection, for which we derived an upper limit of the CO line luminosity of {L_CO{′} = 0.3×10^{10}} K km/s/pc2, which is not inconsistent with the {L{′}_CO}-LFIR relation for starburst galaxies. The best-fit model to the optical and near-infrared photometry give a stellar population with an age of 1.4 Gyr and a stellar mass of 1.6x1010 M. The optical morphology is compact and in the source plane the galaxy has an extent of ∼6x3 kpc with individual star-forming knots of <500 pc in size. J163556 is not resolved in the SMA data, and we place a strict upper limit on the size of the starburst region of 8 kpcx3 kpc, which implies a lower limit on the SFR surface density of 12 M/yr kpc2. The redshift of J163556 extends the redshift distribution of faint, lensed SMGs, and we find no evidence that these have a different redshift distribution than bright SMGs.

Abstract Copyright:

Journal keyword(s): galaxies: high-redshift - galaxies: individual: SMM J163556+661300 - submillimeter: galaxies

Simbad objects: 12

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