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This paper introduces SMACC -- Subhalo Mass-loss Analysis using CoreCatalogs. SMACC adds a mass model to substructure merger trees based on halo"core tracking." Our approach avoids the need for running expensive subhalofinding algorithms and instead uses subhalo mass-loss modeling to assign massesto halo cores. We present details of the SMACC methodology and demonstrate itsexcellent performance in describing halo substructure and its evolution.Validation of the approach is carried out using cosmological simulations atsignificantly different resolutions. We apply SMACC to the 1.24trillion-particle Last Journey simulation and construct core catalogs with theadditional mass information. These catalogs can be readily used as input tosemi-analytic models or subhalo abundance matching approaches to determineapproximate galaxy distributions, as well as for in-depth studies ofsmall-scale structure evolution.

The Last Journey. II. SMACC -- Subhalo Mass-loss Analysis using Core Catalogs