diff options
Diffstat (limited to 'fg21sim')
| -rw-r--r-- | fg21sim/configs/config.spec | 7 | ||||
| -rw-r--r-- | fg21sim/extragalactic/clusters/halo.py | 33 |
2 files changed, 40 insertions, 0 deletions
diff --git a/fg21sim/configs/config.spec b/fg21sim/configs/config.spec index 0d7e7aa..fefb8b8 100644 --- a/fg21sim/configs/config.spec +++ b/fg21sim/configs/config.spec @@ -440,3 +440,10 @@ stream = option("stderr", "stdout", "", default="stderr") # the acceleration is turned off and only leaves energy loss mechanisms. # Unit: [Gyr] time_init = float(default=1.0, min=0) + + # The frequency and factor used to determine whether the radio halo is + # genuine, i.e., the flux density at ``fiducial_freq`` is at least + # ``fiducial_factor`` times the fiducial value. + # Unit: [MHz] + fiducial_freq = float(default=150.0) + fiducial_factor = float(default=3.0, min=1) diff --git a/fg21sim/extragalactic/clusters/halo.py b/fg21sim/extragalactic/clusters/halo.py index ed6b4d3..0db0b0d 100644 --- a/fg21sim/extragalactic/clusters/halo.py +++ b/fg21sim/extragalactic/clusters/halo.py @@ -63,6 +63,7 @@ from scipy import integrate from . import helper from .solver import FokkerPlanckSolver +from .emission import HaloEmission from ...share import CONFIGS, COSMO from ...utils.units import (Units as AU, UnitConversions as AUC, @@ -164,6 +165,8 @@ class RadioHalo: self.time_step = configs.getn(comp+"/time_step") self.time_init = configs.getn(comp+"/time_init") self.injection_index = configs.getn(comp+"/injection_index") + self.fiducial_freq = configs.getn(comp+"/fiducial_freq") + self.fiducial_factor = configs.getn(comp+"/fiducial_factor") def _set_solver(self): self.fpsolver = FokkerPlanckSolver( @@ -478,12 +481,42 @@ class RadioHalo: self._acceleration_disabled = True self.fpsolver.tstep = self.time_step * 2 # To save time + logger.debug("Calculating the %s electron spectrum ..." % + ("[fiducial]" if fiducial else "")) n_e = self.fpsolver.solve(u0=n0_e, tstart=tstart, tstop=tstop) self._acceleration_disabled = False self.fpsolver.tstep = self.time_step return n_e + def is_genuine(self, n_e): + """ + Check whether the radio halo is genuine/observable by comparing the + radio flux density to the fiducial value, which is calculated from + the fiducial electron spectrum derived with turbulent acceleration + turned off. + + Parameters + ---------- + n_e : float 1D `~numpy.ndarray` + The finally derived electron spectrum. + Unit: [cm^-3] + + Returns + ------- + genuine : bool + """ + haloem = HaloEmission(gamma=self.gamma, n_e=n_e, + B=self.B_obs, radius=self.radius, + redshift=self.z_obs) + flux = haloem.calc_flux(self.fiducial_freq) + + ne_fiducial = self.calc_electron_spectrum(fiducial=True) + haloem.n_e = ne_fiducial + flux_fiducial = haloem.calc_flux(self.fiducial_freq) + + return flux >= flux_fiducial * self.fiducial_factor + def fp_injection(self, gamma, t=None): """ Electron injection (rate) term for the Fokker-Planck equation. |