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-rw-r--r--fg21sim/extragalactic/clusters/halo.py25
1 files changed, 23 insertions, 2 deletions
diff --git a/fg21sim/extragalactic/clusters/halo.py b/fg21sim/extragalactic/clusters/halo.py
index 1efaf8f..575decd 100644
--- a/fg21sim/extragalactic/clusters/halo.py
+++ b/fg21sim/extragalactic/clusters/halo.py
@@ -746,6 +746,28 @@ class RadioHalo:
mass = rate * (t - t_merger) + self.M_main
return mass
+ def _magnetic_field(self, t):
+ """
+ Calculate the mean magnetic field strength of the main cluster mass
+ at the given (cosmic) time.
+
+ Parameters
+ ----------
+ t : float
+ The (cosmic) time/age.
+ Unit: [Gyr]
+
+ Returns
+ -------
+ B : float
+ The mean magnetic field strength of the main cluster.
+ Unit: [uG]
+ """
+ z = COSMO.redshift(t)
+ mass = self._mass(t) # [Msun]
+ B = helper.magnetic_field(mass=mass, z=z) # [uG]
+ return B
+
def _loss_ion(self, gamma, t):
"""
Energy loss through ionization and Coulomb collisions.
@@ -783,8 +805,7 @@ class RadioHalo:
----------
Ref.[sarazin1999],Eq.(6,7)
"""
+ B = self._magnetic_field(t) # [uG]
z = COSMO.redshift(t)
- mass = self._mass(t) # [Msun]
- B = helper.magnetic_field(mass=mass, z=z) # [uG]
loss = -4.32e-4 * gamma**2 * ((B/3.25)**2 + (1+z)**4)
return loss