Planck Diffuse Component Separation TWG 2 1 Review

TWG 2. 1 24 Members Mark Ashdown, Vladislav Stolyarov (CPAC, Cambridge) Carlo Baccigalupi, Francesca

TWG 2. 1 Criticalities • • Unique package Flexibility (results, ongoing) Maps, Harmonics &

TWG 2. 1 Results Review Flexibility: indications of stability against spectral index variation of

TWG 2. 1 Activity Review Flexibility: preparing study of Fast. ICA stability against principal

TWG 2. 1 Urgent Tasks • • • Deal with Planck systematics Establish a

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Planck Diffuse Component Separation TWG 2. 1 Review coordinators Carlo Baccigalupi, Simon Prunet, Michael Linden-Vornle Santander, October 14, 2001

TWG 2. 1 24 Members Mark Ashdown, Vladislav Stolyarov (CPAC, Cambridge) Carlo Baccigalupi, Francesca Perrotta (SISSA, Trieste) James Bartlett, Alain Bouquet, Jacques Delabrouille, Yannick Giraud-Heraud, Jean Kaplan (Cd. F, Paris) Luigi Bedini, Emanuele Salerno, Anna Tonazzini, Ercan Kuruoglu (IEI, Pisa) Pisa Carlo Burigana, Lucia Popa (Te. SRE, 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)

TWG 2. 1 Criticalities • • Unique package Flexibility (results, ongoing) Maps, Harmonics & TODs (results, ongoing) Blind and non-Blind merging (results, ongoing) Polarisation (results) Point Sources Interface (results, ongoing) Technique inventing & development (ongoing) Test with incoming CMB data (results, ongoing)

TWG 2. 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 Fast. ICA 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)

TWG 2. 1 Activity Review Flexibility: preparing study of Fast. ICA stability against principal systematics; parameter adjustment by spectral matching Blind & non-Blind merging: testing IFA on simulations Point source interface: matching MHW with Fast. ICA Testing with incoming CMB data: spectral matching on Archeops, Fast. ICA & MEM for COBE, preparing for MAP Technique inventing & development: imprint on non-Gaussianity Of MEM based component separation

TWG 2. 1 Urgent Tasks • • • Deal with Planck systematics Establish a Strategy for MAP Nullify distances TWG 2. 1 Web Site. . .