TRILEGAL 1.6 input form

Warning! (17mar13) We are forced to limit the maximum CPU time to 10 min. If this is too short, please split your simulation into smaller areas.

New version! (10Sep12) v1.6 becomes the default. It's the result of correcting some bugs in the central disk densities (for thin and thick disks), and then recalibrating their parameters. A provisional description of these changes is in this paper. Changes are not dramatic but are in the sense of improving agreeent with data. The previous version is still available in v1.5.

Help FAQ Papers People History

Pointing parametersUsing Epoch 2000, decimal numbers:
Galactic coordinates centered on l = deg, b = deg
Equatorial coordinates centered on α = h, δ = deg
Total field area = deg² (max=10 deg²)

Photometric systemBolometric corrections are computed as in Girardi et al. 2002.
Available systems:
Limiting magnitude in ^th filter is set to mag (max=32 mag)
Distance modulus resolution of Galaxy components is mag (min=0.05 mag)

IMF and binariesIMF for single stars:

Turn binaries onoff
Binary fraction = with mass ratios between and

Print binary components as a single entry separately

ExtinctionNo dust extinction or

Exponential disk exp(-|z|/h_z_,dust)×exp(-R/h_R_,dust)
with scale heigth h_z_,dust= pc and scale length h_R_,dust= pc
Local calibration: dA_V/dr(☉)= mag/pc
Calibration at infinity: A_V(∞)= mag

1σ dispersion= times the total extinction (max=0.3)

Solar positionSun's Galactocentric radius R☉= pc, height above disk z☉= pc

Thin discNo thin disc or

Along z: Exponential: exp(-|z|/h_z_,d) Squared hyperbolic secant: sech²(0.5z/h_z_,d)
with scale height h_z_,d increasing with age t cf. h_z_,d=z₀(1+t/t₀)^α
z₀= pc, t₀= yr, α=.

Along R: Exponential disc: exp(-R/h_R_,d)
with scale length h_R_,d= pc, and inner/outer cutoffs at R= pc and pc.

Local calibration: Σ_d(☉)= M☉/pc²

SFR and AMR given by with age(yr)=×t+.

Thick discNo thick disc or

Along z: Exponential: exp(-|z|/h_z_,td) Squared hyperbolic secant: sech²(0.5z/h_z_,td)
with scale height h_z_,td= pc

Along R: Exponential disc: exp(-R/h_R_,td)
with scale length h_R_,td= pc, and inner/outer cutoffs at R= pc and pc.

Local calibration: Ω_td(☉)= M☉/pc³

SFR and AMR given by with age(yr)=×t+.

HaloNo halo or

r¼ Spheroid
Oblate r¼ Spheroid
Effective radius r_h= pc (at major axis), oblateness q_h=

Local calibration: Ω_h(☉)= M☉/pc³

SFR and AMR given by with age(yr)=×t+.

BulgeSee Vanhollebeke et al. (2009) for details.
No bulge or
Triaxial bulge
Scale length a_m= pc, truncation scale length a₀= pc,
y/x axial ratio η= z/x axial ratio ξ=
Sun-GC-bar angle φ₀=°

Central calibration: Ω_b(GC)= M☉/pc³

SFR and AMR given by with age(yr)=×t+.

Additional object

The addition of star clusters and galaxies is being planned. It requires a major upgrade of the web forms.

This service is mantained by Léo Girardi at the Osservatorio Astronomico di Padova.
Questions, comments and special requests should be directed to leo.girardi@oapd·inaf·it .
Last modified: Thu Jan 30 14:24:21 2020