diff options
Diffstat (limited to 'fg21sim/extragalactic/clusters/halo.py')
| -rw-r--r-- | fg21sim/extragalactic/clusters/halo.py | 62 |
1 files changed, 31 insertions, 31 deletions
diff --git a/fg21sim/extragalactic/clusters/halo.py b/fg21sim/extragalactic/clusters/halo.py index 76bef99..649cfb4 100644 --- a/fg21sim/extragalactic/clusters/halo.py +++ b/fg21sim/extragalactic/clusters/halo.py @@ -524,13 +524,6 @@ class HaloSingle: The calculated electron-acceleration coefficient. (unit: Gyr^-1) - Attributes - ---------- - _coef_acceleration_data : (`~numpy.ndarray`, `~numpy.ndarray`) - (zgrid, chigrid) tuple with ``zgrid`` the array of redshifts - grid with even spacing ``zbs``, and ``chigrid`` the array - of acceleration coefficients at each redshift. - XXX/NOTE -------- This coefficient may be very small and even zero, then the @@ -541,23 +534,7 @@ class HaloSingle: coefficient to be 1/(10*t0), which t0 is the present-day age of the universe. """ - # Redshift bin size - zbs = 0.01 - - if not hasattr(self, "_coef_acceleration_data"): - # Order the merger events by decreasing redshifts - mevents = list(reversed(self.merger_events)) - chi_z = [self._chi_at_zidx(zidx, mevents) - for zidx in range(len(mevents))] - zgrid = np.arange(0.0, self.zmax+zbs, step=zbs) - chigrid = np.zeros(zgrid.shape) - for (chi_, zbegin, zend) in chi_z: - # NOTE: zbegin > zend - mask = (zgrid <= zbegin) & (zgrid >= zend) - chigrid[mask] += chi_ - self._coef_acceleration_data = (zgrid, chigrid) - - zgrid, chigrid = self._coef_acceleration_data + zgrid, chigrid = self._chi_data # XXX: force a minimal value instead of zero or too small chi_min = 1 / (10 * self.cosmo.age0) @@ -574,6 +551,33 @@ class HaloSingle: else: return chi_min + @property + def _chi_data(self): + """ + Returns + ------- + zgrid : 1D `~numpy.ndarray` + Redshift positions where the chi values are calculated. + Same as the attribute ``self.zgrid`` + chigrid : 1D `~numpy.ndarray` + Values of acceleration coefficients at each redshift. + """ + if hasattr(self, "_chi_data_"): + zgrid, chigrid = self._chi_data_ + else: + # Order the merger events by decreasing redshifts + mevents = list(reversed(self.merger_events)) + chi_z = [self._chi_at_zidx(zidx, mevents) + for zidx in range(len(mevents))] + zgrid = self.zgrid + chigrid = np.zeros(zgrid.shape) + for (chi_, zbegin, zend) in chi_z: + # NOTE: zbegin > zend + mask = (zgrid <= zbegin) & (zgrid >= zend) + chigrid[mask] += chi_ + self._chi_data_ = (zgrid, chigrid) + return (zgrid, chigrid) + def _chi_at_zidx(self, zidx, mevents): """ Calculate electron-acceleration coefficient at the specified @@ -594,24 +598,20 @@ class HaloSingle: ------- chi : float The calculated electron-acceleration coefficient. - (unit: Gyr^-1) + Unit: [Gyr^-1] zbegin : float The redshift when the merger begins zend : float The redshift when the merger ends NOTE: zbegin > zend - References - ---------- - [1] Cassano & Brunetti 2005, MNRAS, 357, 1313 - http://adsabs.harvard.edu/abs/2005MNRAS.357.1313C - Eq.(40) + References: Ref.[1],Eq.(40) """ redshifts = np.array([ev["z"] for ev in mevents]) zbegin = mevents[zidx]["z"] M_main = mevents[zidx]["M_main"] M_sub = mevents[zidx]["M_sub"] - t_crossing = self._time_crossing(M_main, M_sub, zbegin) + t_crossing = self._time_crossing(M_main, M_sub, zbegin) # [Gyr] zend = self._z_end(zbegin, t_crossing) try: zend_idx = np.where(redshifts < zend)[0][0] |