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SXDF-UDS-CANDELS-ALMA 1.5 arcmin2 deep survey

  • K. Kohno (a1), Y. Yamaguchi (a1), Y. Tamura (a1), K. Tadaki (a2), B. Hatsukade (a3), S. Ikarashi (a4), K.I. Caputi (a4), W. Rujopakarn (a5) (a6), R.J. Ivison (a7) (a8), J.S. Dunlop (a8), K. Motohara (a1), H. Umehata (a1) (a7), K. Yabe (a5), W.H. Wang (a9), T. Kodama (a3), Y. Koyama (a3), M. Hayashi (a3), Y. Matsuda (a3), D. Hughes (a10), I. Aretxaga (a10), G.W. Wilson (a11), M.S. Yun (a11), K. Ohta (a12), M. Akiyama (a13), R. Kawabe (a3), D. Iono (a3), K. Nakanishi (a3), M. Lee (a3) and R. Makiya (a1)...

Abstract

We have conducted 1.1 mm ALMA observations of a contiguous 105” × 50” or 1.5 arcmin2 window in the SXDF-UDS-CANDELS. We achieved a 5σ sensitivity of 0.28 mJy, giving a flat sensus of dusty star-forming galaxies with L IR ~6×1011 L (if T dust=40K) up to z ~ 10 thanks to the negative K-correction at this wavelength. We detected 5 brightest sources (S/N>6) and 18 low-significant sources (5>S/N>4; they may contain spurious detections, though). One of the 5 brightest ALMA sources (S 1.1mm = 0.84 ± 0.09 mJy) is extremely faint in the WFC3 and VLT/HAWK-I images, demonstrating that a contiguous ALMA imaging survey uncovers a faint dust-obscured population invisible in the deep optical/near-infrared surveys. We find a possible [CII]-line emitter at z=5.955 or a low-z CO emitting galaxy within the field, allowing us to constrain the [CII] and/or CO luminosity functions across the history of the universe.

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