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authorAaron LI <aly@aaronly.me>2018-01-03 23:31:46 +0800
committerAaron LI <aly@aaronly.me>2018-01-03 23:31:46 +0800
commit07a8673ef96964706ec0a5314c22cad16ad65b1e (patch)
treefe05ceca4748f8aecc588760157da5c81754ae57
parenta57a01fab43c6eb692fc04ccb0f0c348a1eba3b1 (diff)
downloadfg21sim-07a8673ef96964706ec0a5314c22cad16ad65b1e.tar.bz2
clusters/halo: change "age_merger" to "age_begin"
-rw-r--r--fg21sim/extragalactic/clusters/halo.py49
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]