ACT (ACTPol) Data Products - Delensed Parameter Shifts Covariance
DR4 Delensed Likelihood Products described in Han et al. 2020Download Links:
Description Parameter Shift Covmatrix Parameter-shift is defined as the difference in a parameter estimated from lensed spectra and from delensed spectra. The dimension of this matrix is 20x20 for 20 free parameters analyzed in Han et al (6 LCDM parameters + 14 foreground parameters). The covariance is calculated from the best-fit parameters from 300 simulated lensed and delensed spectra on ACTPol DR4 D56 patch. The parameters are ordered as follows from the first to the last column. 'omegabh2','omegach2','theta','ns','logA','tau', 'a_tsz_act', 'a_ksz_act', 'xi_act', 'a_d_act', 'a_s_act', 'a_c_act', 'a_g_act', 'a_tps_act', 'a_ps_act', 'a_gte_act', 'a_gee_act', 'beta_c_act', 'yp1_act', 'yp2_act' See the accompanying image file to see what each *_act parameter represents. Since we calculate the covariance matrix with a finite number of simulations, the estimation of the inverse of the covariance is biased. We correct for this bias using the equation (17) in Hartlap et al (https://arxiv.org/abs/astro-ph/0608064). In particular, throughout Han et al, we multiply the inverse of the parameter shift covariance matrix with a factor of (300-20-2)/(300-1). |