Compact potential models for FIRE-2 Milky Way simulations

We have constructed low order (up to l=4) basis-function expansions that model the present-day mass distributions of the FIRE-2 Latte suite of cosmological baryonic simulations of Milky-Way-mass galaxies. Models with two different symmetry assumptions are available:

  1. Axisymmetry (can be used to compute actions in cylindrical coordinates). [*axi_4*]
  2. No symmetry assumptions (better at modeling mergers). [*none_4*]

All the models are fitted to the particle data using AGAMA, with separate basis function expansions to represent the stars/cold gas (cylindrical spline [*coef_cylsp_DR]) and dark matter/hot gas (multipole with piecewise radial profile [*coef_mul_DR]).  A sample Jupyter notebook is available which demonstrates the use of these models to compute various properties. Refer to Arora et al. 2022 for more details.

Sample notebook

Simulation MDM (1012M๏) M* (1010M๏) MGas (1010M๏) M90 (1010M๏) T1/2halo (Gyr) T1/2gal (Gyr) R-2 (kpc) R90 (kpc) Vpeak (km/s) Vsol (km/s)
All simulations
m12_elvis_RomeoJuliet_res3500 1.13 7.97 7.01 6.99 4.73 6.00 11.22 15.89 256.72 249.43
m12_elvis_RomulusRemus_res4000 1.77 11.79 10.65 9.92 4.51 7.46 21.38 18.27 299.34 268.62
m12_elvis_ThelmaLouise_res4000 1.22 8.31 6.47 7.29 4.66 9.23 26.92 13.39 240.59 240.28
m12b_res7100 1.25 9.98 3.20 8.68 6.43 7.67 11.75 11.88 314.99 272.17
m12c_res7100 1.19 6.65 4.15 5.87 8.14 9.12 8.51 10.78 241.37 235.51
m12f_res7100 1.49 9.64 6.70 8.35 6.48 8.56 14.13 16.04 279.50 255.62
m12i_res7100 1.04 7.27 3.58 6.39 4.94 8.34 12.30 10.53 264.71 239.03
m12m_res7100 1.33 13.24 5.04 11.60 5.99 8.77 10.23 13.26 289.12 288.48
m12r_res7100 1.00 2.05 3.07 1.78 9.89 9.37 13.48 15.01 161.16 154.92
m12w_res7100 0.97 6.53 1.15 5.76 6.64 9.50 8.91 10.13 246.97 231.24

Contact:
Arpit Arora
arora125@sas.upenn.edu