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SPT-SZ MCMF: an extension of the SPT-SZ catalogue over the DES region

SPT-SZ MCMF: an extension of the SPT-SZ catalogue over the DES region
SPT-SZ MCMF: an extension of the SPT-SZ catalogue over the DES region

We present an extension to a Sunyaev-Zel'dovich Effect (SZE) selected cluster catalogue based on observations from the South Pole Telescope (SPT); this catalogue extends to lower signal to noise than the previous SPT-SZ catalogue and therefore includes lower mass clusters. Optically derived redshifts, centres, richnesses, and morphological parameters together with catalogue contamination and completeness statistics are extracted using the multicomponent matched filter (MCMF) algorithm applied to the S/N > 4 SPT-SZ candidate list and the Dark Energy Survey (DES) photometric galaxy catalogue. The main catalogue contains 811 sources above S/N = 4, has 91 per cent purity, and is 95 per cent complete with respect to the original SZE selection. It contains in total 50 per cent more clusters and twice as many clusters above z = 0.8 in comparison to the original SPT-SZ sample. The MCMF algorithm allows us to define subsamples of the desired purity with traceable impact on catalogue completeness. As an example, we provide two subsamples with S/N > 4.25 and S/N > 4.5 for which the sample contamination and cleaning-induced incompleteness are both as low as the expected Poisson noise for samples of their size. The subsample with S/N > 4.5 has 98 per cent purity and 96 per cent completeness and is part of our new combined SPT cluster and DES weak-lensing cosmological analysis. We measure the number of false detections in the SPT-SZ candidate list as function of S/N, finding that it follows that expected from assuming Gaussian noise, but with a lower amplitude compared to previous estimates from simulations.

galaxies: clusters: general, galaxies: clusters: intracluster medium, galaxies: distances and redshifts
0035-8711
3973-3990
Klein, M.
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Mohr, J.J.
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Bocquet, S.
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Aguena, M.
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Allen, S.W.
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Alves, O.
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Ansarinejad, B.
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Ashby, M L.N.
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Bacon, D.
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Bayliss, M.
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Brodwin, M.
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Brooks, D.
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Burke, D.L.
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Canning, R.E.A.
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Carlstrom, J.E.
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Rosell, A.C.
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Carretero, J.
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Chang, C.L.
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Conselice, C.
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Costanzi, M.
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Crites, A.T.
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Da Costa, L.N.
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Pereira, M.E.S.
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Davis, T.M.
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De Vicente, J.
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Desai, S.
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De Haan, T.
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Dobbs, M.A.
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Doel, P.
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Ferrero, I.
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Flores, A.M.
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Frieman, J.
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George, E.M.
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Giannini, G.
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Gladders, M.D.
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Gonzalez, A. H.
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Grandis, S.
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Gruen, D.
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Gruendl, R.A.
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Gutierrez, G.
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Halverson, N.W.
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Hinton, S.R.
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Holder, G.P.
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Hollowood, D.L.
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Holzapfel, W.L.
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Smith, M.
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Wiseman, P.
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et al.
Klein, M.
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Mohr, J.J.
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Bocquet, S.
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Aguena, M.
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Allen, S.W.
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Alves, O.
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Ansarinejad, B.
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Ashby, M L.N.
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Bacon, D.
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Bayliss, M.
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Benson, B.A.
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Bleem, L. E.
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Brodwin, M.
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Brooks, D.
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Bulbul, E.
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Burke, D.L.
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Canning, R.E.A.
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Carlstrom, J.E.
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Rosell, A.C.
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Carretero, J.
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Chang, C.L.
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Conselice, C.
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Costanzi, M.
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Crites, A.T.
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Da Costa, L.N.
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Pereira, M.E.S.
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Davis, T.M.
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De Vicente, J.
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Desai, S.
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De Haan, T.
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Dobbs, M.A.
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Doel, P.
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Ferrero, I.
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Flores, A.M.
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Frieman, J.
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George, E.M.
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Giannini, G.
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Gladders, M.D.
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Gonzalez, A. H.
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Grandis, S.
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Gruen, D.
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Gruendl, R.A.
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Gutierrez, G.
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Halverson, N.W.
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Hinton, S.R.
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Holder, G.P.
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Hollowood, D.L.
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Holzapfel, W.L.
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Smith, M.
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Wiseman, P.
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Klein, M., Mohr, J.J. and Bocquet, S. , et al. (2024) SPT-SZ MCMF: an extension of the SPT-SZ catalogue over the DES region. Monthly Notices Of The Royal Astronomical Society, 531 (4), 3973-3990. (doi:10.1093/mnras/stae1359).

Record type: Article

Abstract

We present an extension to a Sunyaev-Zel'dovich Effect (SZE) selected cluster catalogue based on observations from the South Pole Telescope (SPT); this catalogue extends to lower signal to noise than the previous SPT-SZ catalogue and therefore includes lower mass clusters. Optically derived redshifts, centres, richnesses, and morphological parameters together with catalogue contamination and completeness statistics are extracted using the multicomponent matched filter (MCMF) algorithm applied to the S/N > 4 SPT-SZ candidate list and the Dark Energy Survey (DES) photometric galaxy catalogue. The main catalogue contains 811 sources above S/N = 4, has 91 per cent purity, and is 95 per cent complete with respect to the original SZE selection. It contains in total 50 per cent more clusters and twice as many clusters above z = 0.8 in comparison to the original SPT-SZ sample. The MCMF algorithm allows us to define subsamples of the desired purity with traceable impact on catalogue completeness. As an example, we provide two subsamples with S/N > 4.25 and S/N > 4.5 for which the sample contamination and cleaning-induced incompleteness are both as low as the expected Poisson noise for samples of their size. The subsample with S/N > 4.5 has 98 per cent purity and 96 per cent completeness and is part of our new combined SPT cluster and DES weak-lensing cosmological analysis. We measure the number of false detections in the SPT-SZ candidate list as function of S/N, finding that it follows that expected from assuming Gaussian noise, but with a lower amplitude compared to previous estimates from simulations.

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Accepted/In Press date: 11 May 2024
e-pub ahead of print date: 13 June 2024
Published date: 17 June 2024
Keywords: galaxies: clusters: general, galaxies: clusters: intracluster medium, galaxies: distances and redshifts

Identifiers

Local EPrints ID: 491900
URI: http://eprints.soton.ac.uk/id/eprint/491900
ISSN: 0035-8711
PURE UUID: 4710fb8f-c915-4e9d-ab5f-5028a4192422
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512

Catalogue record

Date deposited: 05 Jul 2024 16:52
Last modified: 12 Sep 2024 01:53

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Contributors

Author: M. Klein
Author: J.J. Mohr
Author: S. Bocquet
Author: M. Aguena
Author: S.W. Allen
Author: O. Alves
Author: B. Ansarinejad
Author: M L.N. Ashby
Author: D. Bacon
Author: M. Bayliss
Author: B.A. Benson
Author: L. E. Bleem
Author: M. Brodwin
Author: D. Brooks
Author: E. Bulbul
Author: D.L. Burke
Author: R.E.A. Canning
Author: J.E. Carlstrom
Author: A.C. Rosell
Author: J. Carretero
Author: C.L. Chang
Author: C. Conselice
Author: M. Costanzi
Author: A.T. Crites
Author: L.N. Da Costa
Author: M.E.S. Pereira
Author: T.M. Davis
Author: J. De Vicente
Author: S. Desai
Author: T. De Haan
Author: M.A. Dobbs
Author: P. Doel
Author: I. Ferrero
Author: A.M. Flores
Author: J. Frieman
Author: E.M. George
Author: G. Giannini
Author: M.D. Gladders
Author: A. H. Gonzalez
Author: S. Grandis
Author: D. Gruen
Author: R.A. Gruendl
Author: G. Gutierrez
Author: N.W. Halverson
Author: S.R. Hinton
Author: G.P. Holder
Author: D.L. Hollowood
Author: W.L. Holzapfel
Author: M. Smith ORCID iD
Author: P. Wiseman ORCID iD
Corporate Author: et al.

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