Planck CMB Map Reconstruction using LGMCA

Reconstruction The CosmoStat laboratory (LCS) from CEA-IRFU has released a new map of the CMB using an original component separation technique coined LGMCA. Based on the sparse modeling of signals – a framework recently developed in applied mathematics – the proposed component separation method is well-suited for the extraction of foreground emissions. The LCS released a CMB based on the joint processing of the Planck and WMAP 9 years data coined WPR1 LGMCA map.

Together with the WPR1, we also release a LGMCA estimate of the CMB map from Planck-only (PR1). This webpage provides some comparisons between the PR1 and WPR1 maps and codes to recompute the map. A short description of the LGMCA algorithm can be found at this location.

## WPR1 and PR1 have compatible power spectra ** **

Left, estimated power spectrum of the WPR1 LGMCA map (red) and official PR1 power spectrum (green). The solid black line is the Planck-only best-fit C_l provided by the Planck consortium. Right, power spectrum in logarithmic scale. Error bars are set to 1 sigma.

Left, difference between the power spectrum estimated from the WPR1 LGMCA map (red) (*resp.* PR1 LGMCA power spectrum (green)) and the Planck-only best-fit provided by the Planck consortium. Right, difference between the estimated and theoretical power spectra in logarithmic scale. Error bars are set to 1 sigma.

## Reference

- J. Bobin, F. Sureau, J.-L. Starck, A. Rassat and P. Paykari, “Joint Planck and WMAP CMB Map Reconstruction“,
**Astronomy and Astrophysics**, accepted.