1. Planck Diffuse Component Separation TWG2.1 Review coordinators Carlo Baccigalupi, Simon Prunet, Michael Linden-Vornle Michael Linden-Vornle Santander, October 14, 2001

2. TWG2.1 24 Members Mark Ashdown, Vladislav Stolyarov Mark Ashdown, Vladislav Stolyarov (CPAC, Cambridge) Carlo Baccigalupi, Francesca Perrotta (SISSA, Trieste) James Bartlett, Alain Bouquet, Jacques Delabrouille, Yannick Giraud-Heraud, Jean Kaplan (CdF, Paris) Luigi Bedini, Emanuele Salerno, Anna Tonazzini, IEI, Pisa Ercan Kuruoglu (IEI, Pisa) Carlo Burigana, Lucia Popa (TeSRE, Bologna) Krzysztof Gorski (MPA, Munich) Eric Hivon, Jeffrey Jewell, Steve Levin (JPL, Pasadena) Patrick Leahy (Jodrell Bank) Michael Linden-Vornle (DSRI, Copenaghen) Davide Maino (Milano) Simon Prunet (IAP, Paris) Benjamin Wandelt (Princeton)

3. TWG2.1 Criticalities Unique packageUnique package Flexibility (results,ongoing)Flexibility (results,ongoing) Maps, Harmonics & TODs (results,ongoing)Maps, Harmonics & TODs (results,ongoing) Blind and non-Blind merging (results,ongoing)Blind and non-Blind merging (results,ongoing) Polarisation (results)Polarisation (results) Point Sources Interface (results,ongoing)Point Sources Interface (results,ongoing) Technique inventing & development (ongoing)Technique inventing & development (ongoing) Test with incoming CMB data (results,ongoing)Test with incoming CMB data (results,ongoing)

4. TWG2.1 Results Review Flexibility: indications of stability against spectral index variation of ICA based techniques (Baccigalupi et al. 2002); effective removing of instrumental noise patterns (Delabrouille, Patanchon, Audit 2002; built-in non-stationary noise techniques (Kuruoglu 2002) Maps, Harmonics & TODs: MEM & WF matching with the harmonic space analysis (Stolyarov et al. 2002, Challinor et al. 2002; Prunet et al. 2001) Blind & non-Blind merging: blind estimation of separation matrix & Wiener filtering (Cardoso et al. 2002); constraining elements of the separation matrix & source distributions (Bedini, Salerno, Tonazzini 2001) Polarisation: application of FastICA to polarised maps (Baccigalupi et al. 2002) Point source interface: results of matching MEM & MHW (Vielva et al. 2001) Technique inventing & development: EM algorithm & IFA technique (Snoussi et al. 2001, Bedini, Salerno, Tonazzini 2001) Testing with incoming CMB data: Archeops (Patanchon et al. 2002)

5. TWG2.1 Activity Review Flexibility: preparing study of FastICA stability against principal systematics; parameter adjustment by spectral matching Blind & non-Blind merging: testing IFA on simulations Point source interface: matching MHW with FastICA Testing with incoming CMB data: spectral matching on Archeops, FastICA & MEM for COBE, preparing for MAP Technique inventing & development: imprint on non-Gaussianity Of MEM based component separation

6. TWG2.1 Urgent Tasks Deal with Planck systematicsDeal with Planck systematics Establish a Strategy for MAPEstablish a Strategy for MAP Nullify distancesNullify distances TWG2.1 Web SiteTWG2.1 Web Site......