We evaluate the construction methodology of an all-sky catalogue of galaxy clusters detected through the Sunyaev-Zel'dovich (SZ) effect. We perform an extensive comparison of twelve algorithms applied to the same detailed simulations of the millimeter and submillimeter sky based on a Planck-like case. We present the results of this ''SZ Challenge'' in terms of catalogue completeness, purity, astrometric and photometric reconstruction. Our results provide a comparison of a representative sample of SZ detection algorithms and highlight important issues in their application. In our study case, we show that the exact expected number of clusters remains uncertain (about a thousand cluster candidates at |b| {\gt 20 deg with 90\% purity) and that it depends on the SZ model and on the detailed sky simulations, and on algorithmic implementation of the detection methods. We also estimate the astrometric precision of the cluster candidates which is found of the order of \~{}2 arcmin on average, and the photometric uncertainty of about 30\%, depending on flux. }

Melin, J., Aghanim, N., Bartelmann, M., Bartlett, J., Betoule, M., Bobin, J., et al. (2012). A comparison of algorithms for the construction of SZ cluster catalogues. ASTRONOMY & ASTROPHYSICS, 548, A51-A51 [10.1051/0004-6361/201015689].

### A comparison of algorithms for the construction of SZ cluster catalogues

#### Abstract

We evaluate the construction methodology of an all-sky catalogue of galaxy clusters detected through the Sunyaev-Zel'dovich (SZ) effect. We perform an extensive comparison of twelve algorithms applied to the same detailed simulations of the millimeter and submillimeter sky based on a Planck-like case. We present the results of this ''SZ Challenge'' in terms of catalogue completeness, purity, astrometric and photometric reconstruction. Our results provide a comparison of a representative sample of SZ detection algorithms and highlight important issues in their application. In our study case, we show that the exact expected number of clusters remains uncertain (about a thousand cluster candidates at |b| {\gt 20 deg with 90\% purity) and that it depends on the SZ model and on the detailed sky simulations, and on algorithmic implementation of the detection methods. We also estimate the astrometric precision of the cluster candidates which is found of the order of \~{}2 arcmin on average, and the photometric uncertainty of about 30\%, depending on flux. }
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Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/05 - Astronomia e Astrofisica
English
Con Impact Factor ISI
cosmology: observations, galaxies: clusters: general, galaxies: clusters: intracluster medium, cosmic background radiation, methods: data analysis
http://www.aanda.org/articles/aa/pdf/2012/12/aa15689-10.pdf
Melin, J., Aghanim, N., Bartelmann, M., Bartlett, J., Betoule, M., Bobin, J., et al. (2012). A comparison of algorithms for the construction of SZ cluster catalogues. ASTRONOMY & ASTROPHYSICS, 548, A51-A51 [10.1051/0004-6361/201015689].
Melin, J; Aghanim, N; Bartelmann, M; Bartlett, J; Betoule, M; Bobin, J; Carvalho, P; Chon, G; Delabrouille, J; Diego, J; Harrison, D; Herranz, D; Hobson, M; Kneissl, R; Lasenby, A; Le Jeune, M; Lopez Caniego, M; Mazzotta, P; Rocha, G; Schaefer, B; Starck, J; Waizmann, J; Yvon, D
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Utilizza questo identificativo per citare o creare un link a questo documento: `https://hdl.handle.net/2108/91364`
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