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. 2021, in prep 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