Redshift z = 0 snapshot of the m12f synthetic galaxy considering only stellar particles located within 30 kpc from the galactic center at that particular instant in time. Top: Gaussian kernel density estimate for the age distribution of the m12f stellar particles. Spikes are noticeable at ages 6.5 and 1.4 Gyr. Bottom: scatter plot of d_form as a function of age. Accreted galaxies are shown as curves of continuously generating stellar particles approaching from distances d > 100 kpc, eventually colliding with m12f. These collisions coincide with spikes in star formation.