diff options
Diffstat (limited to 'fg21sim')
| -rw-r--r-- | fg21sim/extragalactic/clusters/halo.py | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/fg21sim/extragalactic/clusters/halo.py b/fg21sim/extragalactic/clusters/halo.py index 6b91f7f..78ecbae 100644 --- a/fg21sim/extragalactic/clusters/halo.py +++ b/fg21sim/extragalactic/clusters/halo.py @@ -338,19 +338,21 @@ class RadioHalo: Generally, the turbulent acceleration timescale is about 0.1 Gyr. It is shown that this acceleration timescale depends weakly on cluster mass and redshift, therefore, its value is derived at the - beginning of the merger and assumed to be constant throughout the + beginning of the merger and assumed to be constant during the merging period. Reference: Ref.[brunetti2016],Eq.(8,9) """ - Mach = self.Mach_turbulence - Rvir = helper.radius_virial(mass=self.M_main, z=self.z_merger) + # Turbulence injection scale: assumed to be correlated with the + # radius of the in-falling sub cluster. + Rvir_sub = helper.radius_virial(mass=self.M_sub, z=self.z_merger) + L0 = self.f_lturb * Rvir_sub # [kpc] + cs = helper.speed_sound(self.kT_main) # [km/s] - # Turbulence injection scale - L0 = self.f_lturb * Rvir # [kpc] x = cs*AUC.km2cm / AC.c fx = x * (x**4/4 + x*x - (1+2*x*x) * np.log(x) - 5/4) - term1 = self.f_acc * 2.5 / fx / (Mach/0.5)**4 + + term1 = self.f_acc * 2.5 / fx / (self.Mach_turbulence/0.5)**4 term2 = (L0/300) / (cs/1500) tau = term1 * term2 / 1000 # [Gyr] return tau |