S319.7.07 — SXDF-UDS-CANDELS-ALMA 1.5 arcmin2 deep survey

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Aug 12th at 5:45 PM until 6:00 PM

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Author(s): Kotaro Kohno6, Yoichi Tamura6, Yuki Yamaguchi6, Hideki Umehata6, Wiphu Rujopakarn6, Minju Lee6, Kentaro Motohara6, Ryu Makiya6, Takuma Izumi6, Rob Ivison1, Soh Ikarashi1, Ken-ichi Tadaki3, Tadayuki Kodama4, Bunyo Hatsukade4, Kiyoto Yabe4, Masao Hayashi4, Daisuke Iono4, Yuichi Matsuda4, Kouichiro Nakanishi4, Ryohei Kawabe4, Grant Wilson7, Min S. Yun7, David Hughes2, Karina Caputi8, James Dunlop5

Institution(s): 1. ESO, 2. INAOE, 3. MPE, 4. National Astronomical Observatory of Japan, 5. ROE, 6. The University of Tokyo, 7. UMASS, 8. Univ. of Groningen

We have conducted 1.1 mm ALMA observations of a contiguous 105″ × 50″ or 1.5 arcmin2 window (achieved by 19 point mosaic) in the SXDF-UDS-CANDELS. We achieved a 5σ sensitivity of 0.28 mJy, giving a flat sensus of dusty star-forming galaxies with LIR ~6 × 1011 L (if Tdust = 40 K) or SFR ~100 M yr-1 up to z~10 thanks to the negative K-correction at this wavelength. We detect 5 brightest sources (S/N>6) and 18 low-significant sources (5 > S/N > 4; they may contain spurious detections, though) in the field. We find that these discrete sources are responsible for a faint filamentary emission seen in low-resolution (~30″) heavily confused AzTEC 1.1mm and SPIRE 0.5mm images. One of the 5 brightest ALMA sources is very dark in deep WFC3 and HAWK-I NIR images as well as VLA 1.4 GHz images, demonstrating that deep ALMA imaging can unveil new obscured star-forming galaxy population.