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Deep 1.1mm-wavelength imaging of the GOODS-S field by AzTEC/ASTE - I. Source catalogue and number counts
David Hughes
Acceso Abierto
Source catalogue
We present the first results from a 1.1mm confusion-limited map of the Great Observatories Origins Deep Survey-South (GOODS-S) taken with the AzTEC camera on the Atacama Submillimeter Telescope Experiment. We imaged a 270 arcmin² field to a 1σ depth of 0.48 − 0.73mJy/beam, making this one of the deepest blank-field surveys at mm-wavelengths ever achieved. Although by traditional standards our GOODS-S map is extremely confused due to a sea of faint underlying sources, we demonstrate through simulations that our source identification and number counts analyses are robust, and the techniques discussed in this paper are relevant for other deeply confused surveys. We find a total of 41 dusty starburst galaxies with signal to noise ratios S/N > 3.5 within this uniformly covered region, where only two are expected to be false detections, and an additional seven robust source candidates located in the noisier (1 σ ≈ 1mJy/beam) outer region of the map. We derive the 1.1mm number counts from this field using two different methods: a fluctuation or “P(d)” analysis and a semi-Bayesian technique, and find that both methods give consistent results. Our data are well-fit by a Schechter function model with (Sʹ, N₃ₘJy, α) = (1.3⁺⁰˙¹⁹₋₀․₂₅ mJy, 160⁺²⁷₋₂₈ mJy⁻¹deg⁻²,−2.0). Given the depth of this survey, we put the first tight constraints on the 1.1mm number counts at S₁․₁ₘₘ = 0.5mJy, and we find evidence that the faint-end of the number counts at S₈₅₀μm ≲2.0mJy from various SCUBA surveys towards lensing clusters are biased high. In contrast to the 870 μm survey of this field with the LABOCA camera, we find no apparent under-density of sources compared to previous surveys at 1.1mm; the estimates of the number counts of SMGs at flux densities > 1mJy determined here are consistent with those measured from the AzTEC/SHADES survey. Additionally, we find a significant number of SMGs not identified in the LABOCA catalogue. We find that in contrast to observations at 𝜆 ≤ 6 500 μm, MIPS 24 μm sources do not resolve the total energy density in the cosmic infrared background at 1.1mm, demonstrating that a population of z ≳ 3 dust-obscured galaxies that are unaccounted for at these shorter wavelengths potentially contribute to a large fraction ( ∼ 2/3) of the infrared background at 1.1mm.
Monthly Notices of the Royal Astronomical Society
Público en general
Scott, K.S., et al., (2010). Deep 1.1mm-wavelength imaging of the GOODS-S field by AzTEC/ASTE - I. Source catalogue and number counts, Monthly Notices of the Royal Astronomical Society. Vol.405(4):2260-2278
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Appears in Collections:Artículos de Astrofísica

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