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Title:
Detecting Sunyaev-Zel'dovich clusters with Planck - III. Properties of the expected SZ cluster sample
Authors:
Malte Schäfer, Björn; Bartelmann, Matthias
Affiliation:
AA(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, Postfach 1317, 85741 Garching bei München, Germany; Institute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Hampshire Terrace, Portsmouth PO12EG), AB(Institut für theoretische Astrophysik, Zentrum für Astronomie, Universität Heidelberg, Albert-Ueberle-Strasse 2, 69120 Heidelberg, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 377, Issue 1, pp. 253-268. (MNRAS Homepage)
Publication Date:
05/2007
Origin:
MNRAS
Astronomy Keywords:
methods: numerical, galaxies: clusters: general, cosmic microwave background
DOI:
10.1111/j.1365-2966.2007.11596.x
Bibliographic Code:
2007MNRAS.377..253M

Abstract

The Planck mission is the most sensitive all-sky submillimetric mission currently being planned and prepared. Special emphasis is given to the observation of clusters of galaxies by their thermal Sunyaev-Zel'dovich (SZ) effect. In this work, the results of a simulation are presented that combines all-sky maps of the thermal and kinetic SZ effect with cosmic microwave background (CMB) fluctuations, Galactic foregrounds (synchrotron emission, thermal emission from dust, free-free emission and rotational transitions of carbon monoxide molecules) and submillimetric emission from planets and asteroids of the Solar System. Observational issues, such as Planck's beam shapes, frequency response and spatially non-uniform instrumental noise have been incorporated. Matched and scale-adaptive multifrequency filtering schemes have been extended to spherical coordinates and are now applied to the data sets in order to isolate and amplify the weak thermal SZ signal. The properties of the resulting SZ cluster sample are characterized in detail. Apart from the number of clusters as a function of cluster parameters such as redshift z and total mass M, the distribution n(σ)dσ of the detection significance σ, the number of detectable clusters in relation to the model cluster parameters entering the filter construction, the position accuracy of an SZ detection and the cluster number density as a function of ecliptic latitude β is examined.

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