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By means of post-processed cosmological Hydrodynamics simulations we explorethe ability of the fossil record method to recover the stellar mass, agegradients, and global/radial star formation and mass growth histories ofgalaxies observed with an optical Integral Field Unity. We use two simulationsof representative Milky Way-sized galaxies, one disk dominated and anotherbulge-dominated. We generate data cubes emulating MaNGA/SDSS-IV instrumentaland observational conditions, and analyze them using the Pipe3D pipeline. Foroptimal MaNGA instrumental/observational setups, the global masses, ages, anddust extinctions of both galaxies are well recovered within the uncertainties,while for the radial distributions, the trend is to get slightly flatter agegradients and weaker inside-out growth modes than the true ones. The main biasis in recovering younger stellar populations in the inner, older regions, andslightly older stellar populations in the outer, younger regions, as well aslower global stellar masses. These trends are enhanced as lower is the spatialsampling/resolution (less number of fibers), more inclined and dust-attenuatedis the observed galaxy, lower is the signal-to-noise ratio, and worse is theseeing. The recovered properties and histories are more affected for thedisk-dominated galaxy with a prominent inside-out growth mode than for thebulge-dominated galaxy assembled earlier and more coherently. We make publiclyavailable the code and the mock IFU datacubes used in this paper.

Optical Integral Field Spectroscopy observations applied to simulated galaxies: Testing the fossil record method