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W-CDF-S, ELAIS-S1, and XMM-LSS will be three Deep-Drilling Fields (DDFs) ofthe Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), but theirextensive multi-wavelength data have not been fully utilized as done in theCOSMOS field, another LSST DDF. To prepare for future science, we fit sourcespectral energy distributions (SEDs) from X-ray to far-infrared in these threefields mainly to derive galaxy stellar masses and star-formation rates. We useCIGALE v2022.0, a code that has been regularly developed and evaluated, for theSED fitting. Our catalog includes 0.8 million sources covering$4.9~\mathrm{deg^2}$ in W-CDF-S, 0.8 million sources covering$3.4~\mathrm{deg^2}$ in ELAIS-S1, and 1.2 million sources covering$4.9~\mathrm{deg^2}$ in XMM-LSS. Besides fitting normal galaxies, we alsoselect candidates that may host active galactic nuclei (AGNs) or areexperiencing recent star-formation variations and use models specificallydesigned for these sources to fit their SEDs; this increases the utility of ourcatalog for various projects in the future. We calibrate our measurements bycomparison with those in well-studied smaller regions and briefly discuss theimplications of our results. We also perform detailed tests of the completenessand purity of SED-selected AGNs. Our data can be retrieved from a publicwebsite.

the astrophysical journal. supplement series/astrophysical journal. supplement series

Spectral Energy Distributions in Three Deep-Drilling Fields of the Vera  C. Rubin Observatory Legacy Survey of Space and Time: Source Classification  and Galaxy Properties