diff options
Diffstat (limited to 'fg21sim/extragalactic')
| -rw-r--r-- | fg21sim/extragalactic/clusters/halo.py | 49 |
1 files changed, 26 insertions, 23 deletions
diff --git a/fg21sim/extragalactic/clusters/halo.py b/fg21sim/extragalactic/clusters/halo.py index 847f57d..73924c6 100644 --- a/fg21sim/extragalactic/clusters/halo.py +++ b/fg21sim/extragalactic/clusters/halo.py @@ -188,16 +188,20 @@ class RadioHalo: return COSMO.age(self.z_obs) @property - def age_merger(self): + def age_begin(self): + """ + The cosmic time when the merger begins. + Unit: [Gyr] + """ return COSMO.age(self.z_merger) @property def tback_merger(self): """ - The time from the observation (``z_obs``) back to the merger - (``z_merger``). + The time from the observation (``z_obs``) back to the beginning + of the merger (``z_merger``). """ - return (self.age_obs - self.age_merger) # [Gyr] + return (self.age_obs - self.age_begin) # [Gyr] @property @lru_cache() @@ -372,12 +376,11 @@ class RadioHalo: @property def electron_spec_init(self): """ - The (default) initial electron spectrum at ``age_merger`` from - which to solve the final electron spectrum at the observation - time by solving the Fokker-Planck equation. + The electron spectrum at ``age_begin`` to be used as the initial + condition for the Fokker-Planck equation. This initial electron spectrum is derived from the accumulated - electron spectrum injected throughout the ``age_merger`` period, + electron spectrum injected throughout the ``age_begin`` period, by solving the same Fokker-Planck equation, but only considering energy losses and constant injection, evolving for a period of ``time_init`` in order to obtain an approximately steady electron @@ -385,15 +388,15 @@ class RadioHalo: Units: [cm^-3] """ - # Accumulated electrons constantly injected until ``age_merger`` + # Accumulated electrons constantly injected until ``age_begin`` n_inj = self.fp_injection(self.gamma) - n0_e = n_inj * (self.age_merger - self.time_init) + n0_e = n_inj * (self.age_begin - self.time_init) logger.debug("Derive the initial electron spectrum ...") # NOTE: subtract ``time_step`` to avoid the acceleration at the - # last step at ``age_merger``. - tstart = self.age_merger - self.time_init - self.time_step - tstop = self.age_merger - self.time_step + # last step at ``age_begin``. + tstart = self.age_begin - self.time_init - self.time_step + tstop = self.age_begin - self.time_step # Use a bigger time step to save time self.fpsolver.tstep = 3 * self.time_step n_e = self.fpsolver.solve(u0=n0_e, tstart=tstart, tstop=tstop) @@ -411,7 +414,7 @@ class RadioHalo: tstart : float, optional The (cosmic) time from when to solve the Fokker-Planck equation for relativistic electrons evolution. - Default: ``self.age_merger``. + Default: ``self.age_begin``. Unit: [Gyr] tstop : float, optional The (cosmic) time when to derive final relativistic electrons @@ -430,7 +433,7 @@ class RadioHalo: Unit: [cm^-3] """ if tstart is None: - tstart = self.age_merger + tstart = self.age_begin if tstop is None: tstop = self.age_obs if n0_e is None: @@ -555,7 +558,7 @@ class RadioHalo: # Maximum acceleration timescale when no turbulence acceleration # NOTE: see the above WARNING! tau_max = 10.0 # [Gyr] - if (t < self.age_merger) or (t > self.age_merger+self.time_turbulence): + if (t < self.age_begin) or (t > self.age_begin+self.time_turbulence): # NO active turbulence acceleration tau_acc = tau_max else: @@ -585,10 +588,10 @@ class RadioHalo: Advection coefficients, describing the energy loss/gain rates. Unit: [Gyr^-1] """ - if t < self.age_merger: + if t < self.age_begin: # To derive the initial electron spectrum - advection = (abs(self._loss_ion(gamma, self.age_merger)) + - abs(self._loss_rad(gamma, self.age_merger))) + advection = (abs(self._loss_ion(gamma, self.age_begin)) + + abs(self._loss_rad(gamma, self.age_begin))) else: # Turbulence acceleration and beyond advection = (abs(self._loss_ion(gamma, t)) + @@ -619,9 +622,9 @@ class RadioHalo: The mass of the main cluster. Unit: [Msun] """ - t_merger = self.age_merger - rate = (self.M_obs - self.M_main) / (self.age_obs - t_merger) - mass = rate * (t - t_merger) + self.M_main + t0 = self.age_begin + rate = (self.M_obs - self.M_main) / (self.age_obs - t0) + mass = rate * (t - t0) + self.M_main return mass def _velocity_turb(self, t=None): @@ -655,7 +658,7 @@ class RadioHalo: Unit: [km/s] """ if t is None: - t = self.age_merger + t = self.age_begin z = COSMO.redshift(t) mass = self.M_main + self.M_sub R_vir = helper.radius_virial(mass=mass, z=z) * AUC.kpc2cm # [cm] |