====== Telecon Notes Sept. 17 2020 ======

[[https://spa-zzz-01.spa.umn.edu/!ipsig/foregrounds|Link to main foregrounds telecons page]] \\
[[https://zzz.physics.umn.edu/ipsig/logbook|Link to logbook]]

Attendance: Ragnhild, Mathieu, Shaul \\
Regrets:  \\

Notes: Shaul \\

  * {{ :20200917_commander_pico.pdf |Ragnhild shares a new set of slides }}
    * slide 1: starts with 90.91, not fitting for synchrotron curvature (because it isn't in the sky; more on that later)
    * 2,3: Finds the best fit model; residual in many bands look very reasonable. 
    * Applies the same model to 90.92. Finds worse chi^2 and more residuals. Residuals in 21 and 25 GHz are opposite in intensity. Similar behavior in other bands. Key point: in real data, such residuals and poor chi^2 would indicate that the model is incomplete. 
    * Discussion: what would happen if you don't have that broad of a frequency range? Suggestion: start with 90.91 with a smaller frequency range. See what you get. Then apply that (with smaller frequency range to 90.92. See what you get. 
    * Blackwell Rao estimator gives biased results even for input CMB - not clear what's going on. Need to debug. 
  * [[https://www.dropbox.com/s/bxpkktg2g2blm2e/nilc_cmilc_pico.pdf?dl=0|Mathieu's slides]]
   * MR shows results with NILC and CMILC with three realization r=0. So far result looks good. There is reduction of foreground residuals as one projects out foreground modes. The increase in noise is not significant yet.