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- W3211819997 abstract "In the era of precision cosmology and ever-improving cosmological simulations, a better understanding of different galaxy components such as bulges and discs will give us new insight into galactic formation and evolution. Based on the fact that the stellar populations of the constituent components of galaxies differ by their dynamical properties, we develop two simple models for galaxy decomposition using the IllustrisTNG cosmological hydrodynamical simulation. The first model uses a single dynamical parameter and can distinguish 4 components: thin disc, thick disc, counter-rotating disc and bulge. The second model uses one more dynamical parameter, was defined in a probabilistic manner, and distinguishes two components: bulge and disc. The number fraction of disc-dominated galaxies at a given stellar mass obtained by our models agrees well with observations for masses exceeding $ log_{10}(M_*/M_odot)=10$. S'ersic indices and half-mass radii for the bulge components agree well with those for real galaxies. The mode of the distribution of S'ersic indices for the disc components is at the expected value of $n=1$. However, disc half-mass radii are smaller than those for real galaxies, in accordance with previous findings that the IllustrisTNG simulation produces undersized discs." @default.
- W3211819997 created "2021-11-22" @default.
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- W3211819997 date "2021-11-08" @default.
- W3211819997 modified "2023-09-24" @default.
- W3211819997 title "Probabilistic model for dynamic galaxy decomposition" @default.
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- W3211819997 doi "https://doi.org/10.1093/mnras/stab3104" @default.
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