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GOODS-ALMA : using IRAC and VLA to probe fainter millimeter galaxies.

Franco, M. and Elbaz, D. and Zhou, L. and Magnelli, B. and Schreiber, C. and Ciesla, L. and Dickinson, M. and Nagar, N. and Magdis, G. and Alexander, D. M. and Béthermin, M. and Demarco, R. and Daddi, E. and Wang, T. and Mullaney, J. and Inami, H. and Shu, X. and Bournaud, F. and Chary, R. and Coogan, R. T. and Ferguson, H. and Finkelstein, S. L. and Giavalisco, M. and Gómez-Guijarro, C. and Iono, D. and Juneau, S. and Lagache, G. and Lin, L. and Motohara, K. and Okumura, K. and Pannella, M. and Papovich, C. and Pope, A. and Rujopakarn, W. and Silverman, J. and Xiao, M. (2020) 'GOODS-ALMA : using IRAC and VLA to probe fainter millimeter galaxies.', Astronomy & astrophysics., 643 . A53.


In this paper, we extend the source detection in the GOODS-ALMA field (69 arcmin2, 1σ ≃ 0.18 mJy beam−1) to deeper levels than presented in our previous work. Using positional information at 3.6 and 4.5 μm (from Spitzer-IRAC) as well as the Very Large Array (VLA) at 3 GHz, we explore the presence of galaxies detected at 1.1 mm with ALMA below our original blind detection limit of 4.8-σ, at which the number of spurious sources starts to dominate over that of real sources. In order to ensure the most reliable counterpart association possible, we have investigated the astrometry differences between different instruments in the GOODS–South field. In addition to a global offset between the Atacama Large Millimeter/submillimeter Array (ALMA) and the Hubble Space Telescope (HST) already discussed in previous studies, we have highlighted a local offset between ALMA and the HST that was artificially introduced in the process of building the mosaic of the GOODS–South image. We created a distortion map that can be used to correct for these astrometric issues. In this Supplementary Catalog, we find a total of 16 galaxies, including two galaxies with no counterpart in HST images (also known as optically dark galaxies), down to a 5σ limiting depth of H = 28.2 AB (HST/WFC3 F160W). This brings the total sample of GOODS-ALMA 1.1 mm sources to 35 galaxies. Galaxies in the new sample cover a wider dynamic range in redshift (z = 0.65−4.73), are on average twice as large (1.3 vs 0.65 kpc), and have lower stellar masses (M⋆SC = 7.6 × 1010 M⊙ vs M⋆MC = 1.2 × 1011 M⊙). Although exhibiting larger physical sizes, these galaxies still have far-infrared sizes that are significantly more compact than inferred from their optical emission.

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Publisher statement:Franco, M., Elbaz, D., Zhou, L., Magnelli, B., Schreiber, C., Ciesla, L., Dickinson, M., Nagar, N., Magdis, G., Alexander, D. M., Béthermin, M., Demarco, R., Daddi, E., Wang, T., Mullaney, J., Inami, H., Shu, X., Bournaud, F., Chary, R., Coogan, R. T., Ferguson, H., Finkelstein, S. L., Giavalisco, M., Gómez-Guijarro, C., Iono, D., Juneau, S., Lagache, G., Lin, L., Motohara, K., Okumura, K., Pannella, M., Papovich, C., Pope, A., Rujopakarn, W., Silverman, J. & Xiao, M. (2020). GOODS-ALMA: Using IRAC and VLA to probe fainter millimeter galaxies. Astronomy & Astrophysics 643: A53 reproduced with permission, © ESO.
Date accepted:07 August 2020
Date deposited:26 November 2020
Date of first online publication:02 November 2020
Date first made open access:26 November 2020

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