Fig. 1.

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Distribution of the mass fraction of kinematic structures in TNG50 galaxies. The sum of the bar heights is normalized to 1. We then classify galaxies into tiny-halo galaxies, halo-subdominated galaxies, and halo-dominated galaxies by fhalo ≤ 0.2, 0.2 < fhalo ≤ 0.5, and fhalo > 0.5, respectively. The criterion fhalo = 0.2 and 0.5 are marked by the black vertical lines. The mass fraction of spheroids fspheroid is equal to fbulge + fhalo. From top to bottom, we show the galaxies with stellar mass log (M⋆/M⊙)∈[109, 1011.5]. The galaxies with log (M⋆/M⊙)∈[9.5, 10.5] are the most representative sample.
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