The mass of the dynamically-hot inner stellar halo predicts the ancient accreted satellite(s) mass

Galactic dynamical structures are fossil records of the assembly histories of galaxies. By analyzing the cosmological hydrodynamical simulation TNG50, we find that a dynamical structure, which we call the 'inner stellar halo', defined by stars on dynamically hot orbits with circularity $\lambda_z < 0.5$ at $3.5\,{\rm kpc}

Keywords:

• Galaxy formation and evolution
• Astrophysics
• Stars
• Physics
• Satellite galaxy
• Galaxy
• Stellar mass
• Bulge
• Halo
• Star formation

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