The Completed Sloan Digital Sky Survey IV Extended Baryon Oscillation Spectroscopic Survey: The Damped Lyα Systems Catalog

Solène Chabanier (1) , Thomas Etourneau (1) , Jean-Marc Le Goff (1) , James Rich (1) , Julianna Stermer (2) , Bela Abolfathi , Andreu Font-Ribera , Alma X. Gonzalez-Morales , Axel de La Macorra , Ignasi Pérez-Ráfols (2) , Patrick Petitjean (3) , Matthew M. Pieri (4) , Corentin Ravoux (1) , Graziano Rossi , Donald P. Schneider

1 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
2 LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies
3 IAP - Institut d'Astrophysique de Paris
4 LAM - Laboratoire d'Astrophysique de Marseille

We present the characteristics of the damped Lyα (DLA) systems found in data release DR16 of the extended Baryon Oscillation Spectroscopic Survey of the Sloan Digital Sky Survey. The DLAs were identified using the convolutional neural network of Parks et al. (2018). A total of 117,458 absorber candidates were found with 2 ≤ z $_{DLA}$ ≤ 5.5 and , including 57,136 DLA candidates with . Mock quasar spectra were used to estimate the DLA detection efficiency and the purity of the resulting catalog. Restricting the quasar sample to bright forests, i.e., those with mean forest fluxes , the efficiency and purity are greater than 90% for DLAs with column densities in the range .

Domaines: Astrophysique [astro-ph]; Analyse de données, Statistiques et Probabilités [physics.data-an]

Solène Chabanier, Thomas Etourneau, Jean-Marc Le Goff, James Rich, Julianna Stermer, et al.. The Completed Sloan Digital Sky Survey IV Extended Baryon Oscillation Spectroscopic Survey: The Damped Lyα Systems Catalog. Astrophys.J.Supp., 2022, 258 (1), pp.18. ⟨10.3847/1538-4365/ac366e⟩. ⟨hal-03314711⟩