The ASTRODEEP-GS43 catalogue: New photometry and redshifts for the CANDELS GOODS-South field^⋆

¹ INAF – OAR, Via Frascati 33, 00078 Monte Porzio Catone, Roma, Italy
e-mail: emiliano.merlin@inaf.it
² Las Campanas Observatory, Carnegie Observatories, Colina El Pino, Casilla 601, La Serena, Chile
³ Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK
⁴ Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, Lisboa, Portugal
⁵ Laboratoire AIM-Paris-Saclay, CEA/DRF/Irfu – CNRS – Université Paris Diderot, CEA-Saclay, Pt Courrier 131, 91191 Gif-sur-Yvette, France
⁶ Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK
⁷ INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35122 Padova, Italy
⁸ INAF – Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34131 Trieste, Italy
⁹ Cosmic Dawn Center (DAWN); Niels Bohr Institute, University of Copenhagen, Lyngbyvej 2, 2100 Copenhagen, Denmark
¹⁰ Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg, Strasbourg 67000, France
¹¹ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Received: 11 January 2021
Accepted: 12 March 2021

Abstract

Context. We present ASTRODEEP-GS43, a new multi-wavelength photometric catalogue of the GOODS-South field, which builds and improves upon the previously released CANDELS catalogue.

Aims. We provide photometric fluxes and corresponding uncertainties in 43 optical and infrared bands (25 wide and 18 medium filters), as well as the photometric redshifts and physical properties of the 34930 CANDELS H-detected objects, plus an additional sample of 178 H-dropout sources, of which 173 are Ks-detected and five are IRAC-detected.

Methods. We keep the CANDELS photometry in seven bands (CTIO U, Hubble Space Telescope WFC3, and ISAAC-K) and measure from scratch the fluxes in the other 36 (23 from Subaru SuprimeCAM and Magellan Baade FourStar and the rest from VIMOS, HST ACS, HAWK-I Ks, and Spitzer IRAC) with state-of-the-art template-fitting techniques. We then compute new photometric redshifts with three different software tools and take the median value as a best estimate. We finally evaluate new physical parameters from spectral energy distribution (SED) fitting, comparing them to previously published ones.

Results. Comparing to a sample of 3931 high quality spectroscopic redshifts, for the new photometric redshifts we obtain a normalised median absolute deviation of 0.015, with 3.01% of outliers on the full catalogue (0.011 and 0.22% on the bright end at I814 <  22.5). This is similar to the best available published samples of photometric redshifts, such as the COSMOS UltraVISTA catalogue.

Conclusions. The ASTRODEEP-GS43 results are in qualitative agreement with previously published catalogues of the GOODS-South field, improving on them particularly in terms of SED sampling and photometric redshift estimates. The catalogue is available for download from the ASTRODEEP website.