cluster.py 文件源码

def _calc_bkg_density(self, r, chisq, refmag):
        """
        Internal method to compute background filter

        parameters
        ----------
        bkg: Background object
           background
        cosmo: Cosmology object
           cosmology scaling info

        returns
        -------

        bcounts: float array
            b(x) for the cluster
        """
        mpc_scale = np.radians(1.) * self.cosmo.Dl(0, self.z) / (1 + self.z)**2
        sigma_g = self.bkg.sigma_g_lookup(self.z, chisq, refmag)
        return 2 * np.pi * r * (sigma_g/mpc_scale**2)