Details

Autor(en) / Beteiligte

• Aghanim, N.
• Douspis, M.
• Hurier, G.
• Crichton, D.
• Diego, J.-M.
• Hasselfield, M.
• Macias-Perez, J.
• Marriage, T. A.
• Pointecouteau, E.
• Remazeilles, M.
• Soubrié, E.

Titel

PACT

Ist Teil von

• Astronomy and astrophysics (Berlin), 2019-12, Vol.632

Ort / Verlag

Heidelberg: EDP Sciences

Erscheinungsjahr

2019

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We present the optimal reconstruction of the thermal Sunyaev–Zel’dovich (tSZ) effect signal based on the combination of a heterogeneous dataset consisting of Atacama Cosmology Telescope (ACT) and Planck data, with different numbers of channels, angular resolutions, and noise levels. We combine both datasets using two different approaches, a matched multifilter (MMF) technique and an optimized internal linear combination (ILC). We show that when applying the MMF to the combination of ACT and Planck data, the size-flux degeneracy is reduced and the signal-to-noise of clusters detected with their Sunyaev–Zel’dovich (SZ) signal improves by up to a factor of three. In the case of the optimized ILC method, we show that the tSZ map is reconstructed with a resolution of ∼1.5 arcmin. This is more than a factor two improvement compared with the Planck resolution, and with a very good control of noise, meaning that it is limited only by the intrinsic noise of the individual experiments. The combination of ACT and Planck data offers a unique opportunity to improve on the study of the pressure profiles and to study substructure in clusters through their tSZ.