GOODS-ALMA: 1.1 mm galaxy survey - I. Source catalogue and optically dark galaxies

M. Franco, D. Elbaz, M. Béthermin, B. Magnelli, C. Schreiber, L. Ciesla, M. Dickinson, N. Nagar, J. Silverman, E. Daddi, D. M. Alexander, T. Wang, M. Pannella, E. Le Floc'h, A. Pope, M. Giavalisco, A. J. Maury, F. Bournaud, R. Chary, R. DemarcoH. Ferguson, S. L. Finkelstein, H. Inami, D. Iono, S. Juneau, G. Lagache, R. Leiton, L. Lin, G. Magdis, H. Messias, K. Motohara, J. Mullaney, K. Okumura, C. Papovich, J. Pforr, W. Rujopakarn, M. Sargent, X. Shu, L. Zhou

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We present a 69 arcmin$^2$ ALMA survey at 1.1mm, GOODS-ALMA, matching the deepest HST-WFC3 H-band part of the GOODS-South field. We taper the 0"24 original image with a homogeneous and circular synthesized beam of 0"60 to reduce the number of independent beams - thus reducing the number of purely statistical spurious detections - and optimize the sensitivity to point sources. We extract a catalogue of galaxies purely selected by ALMA and identify sources with and without HST counterparts down to a 5$\sigma$ limiting depth of H=28.2 AB (HST/WFC3 F160W). ALMA detects 20 sources brighter than 0.7 mJy in the 0"60 tapered mosaic (rms sensitivity =0.18 mJy/beam) with a purity greater than 80%. Among these detections, we identify three sources with no HST nor Spitzer-IRAC counterpart, consistent with the expected number of spurious galaxies from the analysis of the inverted image; their definitive status will require additional investigation. An additional three sources with HST counterparts are detected either at high significance in the higher resolution map, or with different detection-algorithm parameters ensuring a purity greater than 80%. Hence we identify in total 20 robust detections. Our wide contiguous survey allows us to push further in redshift the blind detection of massive galaxies with ALMA with a median redshift of $z$=2.92 and a median stellar mass of M$_{\star}$ = 1.1 $\times 10^{11}$M$_\odot$. Our sample includes 20% HST-dark galaxies (4 out of 20), all detected in the mid-infrared with IRAC. The near-infrared based photometric redshifts of two of them $z\sim$4.3 and 4.8) suggest that these sources have redshifts $z$>4. At least 40% of the ALMA sources host an X-ray AGN, compared to 14% for other galaxies of similar mass and redshift. The wide area of our ALMA survey provides lower values at the bright end of number counts than single-dish telescopes
Original languageEnglish
Article numberA152
Number of pages26
JournalAstronomy & Astrophysics
Early online date11 Dec 2018
Publication statusE-pub ahead of print - 11 Dec 2018


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