Cracking stellar shells | Nature Astronomy
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Illustris is a suite of hydrodynamical simulations that trace the evolution of tens of thousands of galaxies. Pop et al. selected the ~200 most massive simulated galaxies at a redshift of z
= 0 and identified those with shells. The selection was achieved by studying the history of individual star particles in each galaxy and tracing their origins back to satellite galaxies that
had been accreted onto the main galaxy. The authors find that ~18% of their sample of galaxies have stellar shells. This fraction goes up for more massive galaxies and down when considering
galaxies at higher redshifts.
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