Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters
We perform a cross validation of the cluster catalogue selected by the red-sequence Matched-filter Probabilistic Percolation algorithm (redMaPPer) in Dark Energy Survey year 1 (DES-Y1) data by matching it with the Sunyaev-Zel'dovich effect (SZE) selected cluster catalogue from the South Pole Te...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press
2021
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Online Access: | http://sro.sussex.ac.uk/id/eprint/101351/ http://sro.sussex.ac.uk/id/eprint/101351/1/DES-Y1%20Cluster%20Sample%20-%20K%20Romer.pdf https://doi.org/10.1093/mnras/stab869 |
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ftunivsussex:oai:sro.sussex.ac.uk:101351 2023-07-30T04:06:56+02:00 Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters Grandis, S Mohr, J J Costanzi, M Saro, A Bocquet, S Klein, M Aguena, M Allam, S Annis, J Ansarinejad, B Bacon, D Bertin, E Bleem, L Romer, A K Wilkinson, R D others 2021-06-01 application/pdf http://sro.sussex.ac.uk/id/eprint/101351/ http://sro.sussex.ac.uk/id/eprint/101351/1/DES-Y1%20Cluster%20Sample%20-%20K%20Romer.pdf https://doi.org/10.1093/mnras/stab869 en eng Oxford University Press http://sro.sussex.ac.uk/id/eprint/101351/1/DES-Y1%20Cluster%20Sample%20-%20K%20Romer.pdf Grandis, S, Mohr, J J, Costanzi, M, Saro, A, Bocquet, S, Klein, M, Aguena, M, Allam, S, Annis, J, Ansarinejad, B, Bacon, D, Bertin, E, Bleem, L, Romer, A K, Wilkinson, R D and others, (2021) Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters. Monthly Notices of the Royal Astronomical Society, 504 (1). pp. 1253-1272. ISSN 0035-8711 Article PeerReviewed 2021 ftunivsussex https://doi.org/10.1093/mnras/stab869 2023-07-11T20:44:21Z We perform a cross validation of the cluster catalogue selected by the red-sequence Matched-filter Probabilistic Percolation algorithm (redMaPPer) in Dark Energy Survey year 1 (DES-Y1) data by matching it with the Sunyaev-Zel'dovich effect (SZE) selected cluster catalogue from the South Pole Telescope SPT-SZ survey. Of the 1005 redMaPPer selected clusters with measured richness $\hat{\lambda }\gt 40$ in the joint footprint, 207 are confirmed by SPT-SZ. Using the mass information from the SZE signal, we calibrate the richness-mass relation using a Bayesian cluster population model. We find a mass trend λ ∝ MB consistent with a linear relation (B ∼1), no significant redshift evolution and an intrinsic scatter in richness of σλ = 0.22 ± 0.06. By considering two error models, we explore the impact of projection effects on the richness-mass modelling, confirming that such effects are not detectable at the current level of systematic uncertainties. At low richness SPT-SZ confirms fewer redMaPPer clusters than expected. We interpret this richness dependent deficit in confirmed systems as due to the increased presence at low richness of low-mass objects not correctly accounted for by our richness-mass scatter model, which we call contaminants. At a richness $\hat{\lambda }=40$, this population makes up ${\gt}12{{\ \rm per\ cent}}$ (97.5 percentile) of the total population. Extrapolating this to a measured richness $\hat{\lambda }=20$ yields ${\gt}22{{\ \rm per\ cent}}$ (97.5 percentile). With these contamination fractions, the predicted redMaPPer number counts in different plausible cosmologies are compatible with the measured abundance. The presence of such a population is also a plausible explanation for the different mass trends (B ∼0.75) obtained from mass calibration using purely optically selected clusters. The mean mass from stacked weak lensing (WL) measurements suggests that these low-mass contaminants are galaxy groups with masses ∼3-5 × 1013 M⊙ which are beyond the sensitivity of current SZE and X-ray surveys ... Article in Journal/Newspaper South pole University of Sussex: Sussex Research Online South Pole Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) Monthly Notices of the Royal Astronomical Society 504 1 1253 1272 |
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Open Polar |
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University of Sussex: Sussex Research Online |
op_collection_id |
ftunivsussex |
language |
English |
description |
We perform a cross validation of the cluster catalogue selected by the red-sequence Matched-filter Probabilistic Percolation algorithm (redMaPPer) in Dark Energy Survey year 1 (DES-Y1) data by matching it with the Sunyaev-Zel'dovich effect (SZE) selected cluster catalogue from the South Pole Telescope SPT-SZ survey. Of the 1005 redMaPPer selected clusters with measured richness $\hat{\lambda }\gt 40$ in the joint footprint, 207 are confirmed by SPT-SZ. Using the mass information from the SZE signal, we calibrate the richness-mass relation using a Bayesian cluster population model. We find a mass trend λ ∝ MB consistent with a linear relation (B ∼1), no significant redshift evolution and an intrinsic scatter in richness of σλ = 0.22 ± 0.06. By considering two error models, we explore the impact of projection effects on the richness-mass modelling, confirming that such effects are not detectable at the current level of systematic uncertainties. At low richness SPT-SZ confirms fewer redMaPPer clusters than expected. We interpret this richness dependent deficit in confirmed systems as due to the increased presence at low richness of low-mass objects not correctly accounted for by our richness-mass scatter model, which we call contaminants. At a richness $\hat{\lambda }=40$, this population makes up ${\gt}12{{\ \rm per\ cent}}$ (97.5 percentile) of the total population. Extrapolating this to a measured richness $\hat{\lambda }=20$ yields ${\gt}22{{\ \rm per\ cent}}$ (97.5 percentile). With these contamination fractions, the predicted redMaPPer number counts in different plausible cosmologies are compatible with the measured abundance. The presence of such a population is also a plausible explanation for the different mass trends (B ∼0.75) obtained from mass calibration using purely optically selected clusters. The mean mass from stacked weak lensing (WL) measurements suggests that these low-mass contaminants are galaxy groups with masses ∼3-5 × 1013 M⊙ which are beyond the sensitivity of current SZE and X-ray surveys ... |
format |
Article in Journal/Newspaper |
author |
Grandis, S Mohr, J J Costanzi, M Saro, A Bocquet, S Klein, M Aguena, M Allam, S Annis, J Ansarinejad, B Bacon, D Bertin, E Bleem, L Romer, A K Wilkinson, R D others |
spellingShingle |
Grandis, S Mohr, J J Costanzi, M Saro, A Bocquet, S Klein, M Aguena, M Allam, S Annis, J Ansarinejad, B Bacon, D Bertin, E Bleem, L Romer, A K Wilkinson, R D others Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters |
author_facet |
Grandis, S Mohr, J J Costanzi, M Saro, A Bocquet, S Klein, M Aguena, M Allam, S Annis, J Ansarinejad, B Bacon, D Bertin, E Bleem, L Romer, A K Wilkinson, R D others |
author_sort |
Grandis, S |
title |
Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters |
title_short |
Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters |
title_full |
Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters |
title_fullStr |
Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters |
title_full_unstemmed |
Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters |
title_sort |
exploring the contamination of the des-y1 cluster sample with spt-sz selected clusters |
publisher |
Oxford University Press |
publishDate |
2021 |
url |
http://sro.sussex.ac.uk/id/eprint/101351/ http://sro.sussex.ac.uk/id/eprint/101351/1/DES-Y1%20Cluster%20Sample%20-%20K%20Romer.pdf https://doi.org/10.1093/mnras/stab869 |
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ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
South Pole Lambda |
geographic_facet |
South Pole Lambda |
genre |
South pole |
genre_facet |
South pole |
op_relation |
http://sro.sussex.ac.uk/id/eprint/101351/1/DES-Y1%20Cluster%20Sample%20-%20K%20Romer.pdf Grandis, S, Mohr, J J, Costanzi, M, Saro, A, Bocquet, S, Klein, M, Aguena, M, Allam, S, Annis, J, Ansarinejad, B, Bacon, D, Bertin, E, Bleem, L, Romer, A K, Wilkinson, R D and others, (2021) Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters. Monthly Notices of the Royal Astronomical Society, 504 (1). pp. 1253-1272. ISSN 0035-8711 |
op_doi |
https://doi.org/10.1093/mnras/stab869 |
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Monthly Notices of the Royal Astronomical Society |
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504 |
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1 |
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1253 |
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1272 |
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1772819898484916224 |