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

Abstract

In this paper, we extend the source detection in the GOODS-ALMA field (69 arcmin${}^2$, rms sensitivity $\sigma$ $\simeq$ 0.18 mJy.beam${}^{-1}$), to deeper levels than presented in Franco et al. (2018). Using positional information at 3.6 and 4.5 $\mu$m (from Spitzer-IRAC), we explore the presence of galaxies detected at 1.1 mm with ALMA below our original blind detection limit of 4.8-$\sigma$ at which the number of spurious sources starts to dominate over that of real sources. In this Supplementary Catalog, we find a total of 16 galaxies, including 2 galaxies with no counterpart in HST images (also known as optically-dark galaxies) down to a 5$\sigma$ 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 and have lower stellar mass (M${}_{\star }^{\mathrm{SC}}$ = 7.6$\times$10${}^{10}$M${}_{\odot }$ vs M${}_{\star }^{\mathrm{MC}}$ = 1.2$\times$10${}^{11}$M${}_{\odot }$). Although exhibiting larger physical sizes, these galaxies have still far-infrared sizes significantly more compact than inferred from their optical emission. We show that the astrometry of the HST image does not only suffer from a global astrometric shift, as already discussed in previous papers, but also from local shifts. These distortions were artificially introduced in the process of building the mosaic of the GOODS-South HST image. By comparing the positions of almost 400 galaxies detected by HST, Pan-STARRS and ALMA, we create a distortion map which can be used to correct for these astrometric issues.

arXiv comment18 pages, 13 figures. Accepted for publication in A&A

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