Illuminating the Dark Side of Cosmic Star Formation. III. Building the Largest Homogeneous Sample of Radio-selected Dusty Star-forming Galaxies in COSMOS with PhoEBO - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2024

Illuminating the Dark Side of Cosmic Star Formation. III. Building the Largest Homogeneous Sample of Radio-selected Dusty Star-forming Galaxies in COSMOS with PhoEBO

Fabrizio Gentile
  • Fonction : Auteur
Margherita Talia
  • Fonction : Auteur
Meriem Behiri
  • Fonction : Auteur
Giovanni Zamorani
  • Fonction : Auteur
Luigi Barchiesi
  • Fonction : Auteur
Cristian Vignali
  • Fonction : Auteur
Francesca Pozzi
  • Fonction : Auteur
Andrea Enia
  • Fonction : Auteur
Andreas L. Faisst
  • Fonction : Auteur
Marika Giulietti
  • Fonction : Auteur
Carlotta Gruppioni
  • Fonction : Auteur
Andrea Lapi
  • Fonction : Auteur
Marcella Massardi
  • Fonction : Auteur
Vernesa Smolčić
  • Fonction : Auteur
Mattia Vaccari
  • Fonction : Auteur
Andrea Cimatti
  • Fonction : Auteur

Résumé

In the last decades, an increasing scientific interest has been growing in the elusive population of dark (i.e., lacking an optical/near-IR, hereafter NIR, counterpart) dusty star-forming galaxies (DSFGs). Although extremely promising for their likely contribution to the cosmic star formation rate density (SFRD) and for their possible role in the evolution of the first massive and passive galaxies around z ∼ 3, the difficulty in selecting statistically significant samples of dark DSFGs is limiting their scientific potentialities. This work presents the first panchromatic study of a sample of 263 radio-selected NIR-dark (RS-NIRdark) galaxies discovered in the COSMOS field following the procedure by Talia et al. These sources are selected as radio-bright galaxies (S 3 GHz > 12.65 μJy) with no counterpart in the NIR-selected COSMOS2020 catalog (Ks ≳ 25.5 mag). For these sources, we build a new photometric catalog including accurate photometry from the optical to the radio obtained with a new deblending pipeline (Photometry Extractor for Blended Objects, or PHOEBO). We employ this catalog to estimate the photo-zs and the physical properties of the galaxies through an spectral energy distribution-fitting procedure performed with two different codes (MAGPHYS and CIGALE). Finally, we estimate the active galactic nucleus contamination in our sample by performing a series of complementary tests. The high values of the median extinction (A v ∼ 4) and star formation rate (SFR ∼ 500 M yr‑1) confirm the likely DSFG nature of the RS-NIRdark galaxies. The median photo-z (z ∼ 3) and the presence of a significant tail of high-z candidates (z > 4.5) suggest that these sources are important contributors to the cosmic SFRD and the evolutionary path of galaxies at high redshifts.
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Dates et versions

insu-04452622 , version 1 (12-02-2024)

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Fabrizio Gentile, Margherita Talia, Meriem Behiri, Giovanni Zamorani, Luigi Barchiesi, et al.. Illuminating the Dark Side of Cosmic Star Formation. III. Building the Largest Homogeneous Sample of Radio-selected Dusty Star-forming Galaxies in COSMOS with PhoEBO. The Astrophysical Journal, 2024, 962, ⟨10.3847/1538-4357/ad1519⟩. ⟨insu-04452622⟩
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