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In the last decades, an increasing scientific interest has been growing inthe elusive population of "dark" (i.e. lacking an optical/NIR counterpart)Dusty Star-Forming Galaxies (DSFGs). Although extremely promising for theirlikely contribution to the cosmic Star Formation Rate Density and for theirpossible role in the evolution of the first massive and passive galaxies around$z\sim3$, the difficulty in selecting statistically significant samples of darkDSFGs is limiting their scientific potentialities. This work presents the firstpanchromatic study of a sample of 263 Radio-Selected NIRdark galaxiesdiscovered in the COSMOS field following the procedure by Talia+21. Thesesources are selected as radio-bright galaxies (S(3GHz)>12.65 uJy) with nocounterpart in the NIR-selected COSMOS2020 catalog (Ks > 25.5 mag). For thesesources, we build a new photometric catalog including accurate photometry fromthe optical to the radio obtained with a new deblending pipeline (PhoEBO:Photometry Extractor for Blended Objects). We employ this catalog to estimatethe photo-zs and the physical properties of the galaxies through an SED-fittingprocedure performed with two different codes (Magphys and Cigale). Finally, weestimate the AGN contamination in our sample by performing a series ofcomplementary tests. The high values of the median extinction (Av ~ 4) and starformation rate (SFR ~ 500 Msun/yr) confirm the likely DSFG nature of theRS-NIRdark galaxies. The median photo-z (z~3) and the presence of a significanttail of high-z candidates (z>4.5) suggest that these sources are importantcontributors to the cosmic SFRD and the evolutionary path of galaxies at highredshifts.

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