S-PLUS Fornax Project (S+FP)

A catalog of 119580 galaxies was obtained in the direction of the Fornax cluster containing photometric information in the 12 optical bands of S-PLUS complemented with GALEX (UV), VHS-VISTA (NIR) and AllWISE (MIR) data. We estimate photometric redshifts ({sigma}_NMAD_~0.0219) with a lower limit of zlim~0.03. Stellar masses, star formation rates (SFRs) and D4000N index estimates were obtained through a machine learning approach, by matching S-PLUS photometric data to SDSS spectroscopic data.

The completeness of the catalog (72%) was calculated by comparing with mock catalogs. Taking into account our zlim, we were able to identify 119230 background galaxies and to find 350 candidates to be Fornax members or infalling galaxies, not included in our compilation of 1005 galaxies previously reported in the literature. We were also able to classify the galaxies in our catalog as quiescent (43%), star-forming (39%) and transition (18%) galaxies.

In addition, 181 emission line galaxy (ELG) candidates were identified using the filter J0660. The spatial distribution of the galaxies in our catalog show projected overdensities that match 89 background clusters identified by eROSITA. This confirms the robustness of our catalog in tracing real structures.

In that context, we expect that the extragalactic catalog of the S+FP allows us to better understand the large-scale structure in the direction of the Fornax cluster, and to identify the substructures that are feeding Fornax.