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Redshift Evolution of the Fundamental Plane Relation in the IllustrisTNG Simulation
Name
1906.00927.pdf
Description
Accepted version
Size
889.97 KB
Format
Adobe PDF
Checksum (MD5)
f53d19ffd9c0a416b58a4085ea934b2e
Author(s)
Lu, Shengdong
Xu, Dandan
Wang, Yunchong
Mao, Shude
Ge, Junqiang
Springel, Volker
Wang, Yuan
Vogelsberger, Mark
Naiman, Jill
Hernquist, Lars
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Version
Author's final manuscript
Abstract
© 2020 The Author(s). We investigate the Fundamental Plane (FP) evolution of early-type galaxies in the IllustrisTNG- 100 simulation (TNG100) from redshift z = 0 to z = 2. We find that a tight plane relation already exists as early as z = 2. Its scatter stays as low as σ0.08 dex across this redshift range. Both slope parameters b and c (where R ∝ σbIc with R, σ, and I being the typical size, velocity dispersion, and surface brightness) of the plane evolve mildly since z = 2, roughly consistent with observations. The FP residual Res (≡ a + b log σ + c log I - logR, where a is the zero-point of the FP) is found to strongly correlate with stellar age, indicating that stellar age can be used as a crucial fourth parameter of the FP. However, we find that 4c + b + 2 = δ, where δ σ 0.8 for FPs in TNG, rather than zero as is typically inferred from observations. This implies that a tight power-law relation between the dynamical mass-to-light ratio Mdyn/L and the dynamical mass Mdyn (where Mdyn ≡ 5σ2R/G, with G being the gravitational constant) is not present in the TNG100 simulation. Recovering such a relation requires proper mixing between dark matter and baryons, as well as star formation occurring with correct efficiencies at the right mass scales. This represents a powerful constraint on the numerical models, which has to be satisfied in future hydrodynamical simulations.
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DOI of Published Version
10.1093/MNRAS/STAA173
