Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters

S. Grandis; J. J. Mohr; M. Costanzi; A. Saro; S. Bocquet; M. Klein; M. Aguena; S. Allam; J. Annis; B. Ansarinejad; D. Bacon; E. Bertin; L. Bleem; D. Brooks; D. L. Burke; A. Carnero Rosel; M. Carrasco Kind; J. Carretero; F. J. Castander; A. Choi; L. N. Da Costa; J. De Vincente; S. Desai; H. T. Diehl; J. P. Dietrich; P. Doel; T. F. Eifler; S. Everett; I. Ferrero; B. Floyd; P. Fosalba; J. Frieman; J. García-Bellido; E. Gaztanaga; D. Gruen; R. A. Gruendl; J. Gschwend; N. Gupta; G. Gutierrez; S. R. Hinton; D. L. Hollowood; K. Honscheid; D. J. James; T. Jeltema; K. Kuehn; O. Lahav; C. Lidman; M. Lima; M. A.G. Maia; M. March; J. L. Marshall; P. Melchior; F. Menanteau; R. Miquel; R. Morgan; J. Myles; R. Ogando; A. Palmese; F. Paz-Chinchón; A. A. Plazas; C. L. Reichardt; A. K. Romer; E. Sanchez; V. Scarpine; S. Serrano; I. Sevilla-Noarbe; P. Singh; M. Smith; E. Suchyta; M. E.C. Swanson; G. Tarle; D. Thomas; C. To; J. Weller; R. D. Wilkinson; H. Wu

doi:10.1093/mnras/stab869

Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters

S. Grandis, J. J. Mohr, M. Costanzi, A. Saro, S. Bocquet, M. Klein, M. Aguena, S. Allam, J. Annis, B. Ansarinejad, D. Bacon, E. Bertin, L. Bleem, D. Brooks, D. L. Burke, A. Carnero Rosel, M. Carrasco Kind, J. Carretero, F. J. Castander, A. ChoiL. N. Da Costa, J. De Vincente, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, T. F. Eifler, S. Everett, I. Ferrero, B. Floyd, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztanaga, D. Gruen, R. A. Gruendl, J. Gschwend, N. Gupta, G. Gutierrez, S. R. Hinton, D. L. Hollowood, K. Honscheid, D. J. James, T. Jeltema, K. Kuehn, O. Lahav, C. Lidman, M. Lima, M. A.G. Maia, M. March, J. L. Marshall, P. Melchior, F. Menanteau, R. Miquel, R. Morgan, J. Myles, R. Ogando, A. Palmese, F. Paz-Chinchón, A. A. Plazas, C. L. Reichardt, A. K. Romer, E. Sanchez, V. Scarpine, S. Serrano, I. Sevilla-Noarbe, P. Singh, M. Smith, E. Suchyta, M. E.C. Swanson, G. Tarle, D. Thomas, C. To, J. Weller, R. D. Wilkinson, H. Wu

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Abstract

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 but a natural target for SPT-3G and eROSITA.

Original language	English
Pages (from-to)	1253-1272
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	504
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stab869
State	Published - Jun 1 2021
Externally published	Yes

Keywords

galaxies: clusters: general
large-scale structure of Universe
methods: statistical

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10.1093/mnras/stab869

Cite this

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., Brooks, D., Burke, D. L., Carnero Rosel, A., Carrasco Kind, M., Carretero, J., Castander, F. J., ... Wu, H. (2021). Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters. Monthly Notices of the Royal Astronomical Society, 504(1), 1253-1272. https://doi.org/10.1093/mnras/stab869

@article{e84655663c9e4215a6fcade682bea26e,

title = "Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters",

abstract = "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 but a natural target for SPT-3G and eROSITA.",

keywords = "galaxies: clusters: general, large-scale structure of Universe, methods: statistical",

author = "S. Grandis and Mohr, {J. J.} and M. Costanzi and A. Saro and S. Bocquet and M. Klein and M. Aguena and S. Allam and J. Annis and B. Ansarinejad and D. Bacon and E. Bertin and L. Bleem and D. Brooks and Burke, {D. L.} and {Carnero Rosel}, A. and {Carrasco Kind}, M. and J. Carretero and Castander, {F. J.} and A. Choi and {Da Costa}, {L. N.} and {De Vincente}, J. and S. Desai and Diehl, {H. T.} and Dietrich, {J. P.} and P. Doel and Eifler, {T. F.} and S. Everett and I. Ferrero and B. Floyd and P. Fosalba and J. Frieman and J. Garc{\'i}a-Bellido and E. Gaztanaga and D. Gruen and Gruendl, {R. A.} and J. Gschwend and N. Gupta and G. Gutierrez and Hinton, {S. R.} and Hollowood, {D. L.} and K. Honscheid and James, {D. J.} and T. Jeltema and K. Kuehn and O. Lahav and C. Lidman and M. Lima and Maia, {M. A.G.} and M. March and Marshall, {J. L.} and P. Melchior and F. Menanteau and R. Miquel and R. Morgan and J. Myles and R. Ogando and A. Palmese and F. Paz-Chinch{\'o}n and Plazas, {A. A.} and Reichardt, {C. L.} and Romer, {A. K.} and E. Sanchez and V. Scarpine and S. Serrano and I. Sevilla-Noarbe and P. Singh and M. Smith and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and D. Thomas and C. To and J. Weller and Wilkinson, {R. D.} and H. Wu",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.",

year = "2021",

month = jun,

day = "1",

doi = "10.1093/mnras/stab869",

language = "English",

volume = "504",

pages = "1253--1272",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

}

Grandis, S, Mohr, JJ, Costanzi, M, Saro, A, Bocquet, S, Klein, M, Aguena, M, Allam, S, Annis, J, Ansarinejad, B, Bacon, D, Bertin, E, Bleem, L, Brooks, D, Burke, DL, Carnero Rosel, A, Carrasco Kind, M, Carretero, J, Castander, FJ, Choi, A, Da Costa, LN, De Vincente, J, Desai, S, Diehl, HT, Dietrich, JP, Doel, P, Eifler, TF, Everett, S, Ferrero, I, Floyd, B, Fosalba, P, Frieman, J, García-Bellido, J, Gaztanaga, E, Gruen, D, Gruendl, RA, Gschwend, J, Gupta, N, Gutierrez, G, Hinton, SR, Hollowood, DL, Honscheid, K, James, DJ, Jeltema, T, Kuehn, K, Lahav, O, Lidman, C, Lima, M, Maia, MAG, March, M, Marshall, JL, Melchior, P, Menanteau, F, Miquel, R, Morgan, R, Myles, J, Ogando, R, Palmese, A, Paz-Chinchón, F, Plazas, AA, Reichardt, CL, Romer, AK, Sanchez, E, Scarpine, V, Serrano, S, Sevilla-Noarbe, I, Singh, P, Smith, M, Suchyta, E, Swanson, MEC, Tarle, G, Thomas, D, To, C, Weller, J, Wilkinson, RD & Wu, H 2021, 'Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters', Monthly Notices of the Royal Astronomical Society, vol. 504, no. 1, pp. 1253-1272. https://doi.org/10.1093/mnras/stab869

TY - JOUR

T1 - Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters

AU - Grandis, S.

AU - Mohr, J. J.

AU - Costanzi, M.

AU - Saro, A.

AU - Bocquet, S.

AU - Klein, M.

AU - Aguena, M.

AU - Allam, S.

AU - Annis, J.

AU - Ansarinejad, B.

AU - Bacon, D.

AU - Bertin, E.

AU - Bleem, L.

AU - Brooks, D.

AU - Burke, D. L.

AU - Carnero Rosel, A.

AU - Carrasco Kind, M.

AU - Carretero, J.

AU - Castander, F. J.

AU - Choi, A.

AU - Da Costa, L. N.

AU - De Vincente, J.

AU - Desai, S.

AU - Diehl, H. T.

AU - Dietrich, J. P.

AU - Doel, P.

AU - Eifler, T. F.

AU - Everett, S.

AU - Ferrero, I.

AU - Floyd, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Gaztanaga, E.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gupta, N.

AU - Gutierrez, G.

AU - Hinton, S. R.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - James, D. J.

AU - Jeltema, T.

AU - Kuehn, K.

AU - Lahav, O.

AU - Lidman, C.

AU - Lima, M.

AU - Maia, M. A.G.

AU - March, M.

AU - Marshall, J. L.

AU - Melchior, P.

AU - Menanteau, F.

AU - Miquel, R.

AU - Morgan, R.

AU - Myles, J.

AU - Ogando, R.

AU - Palmese, A.

AU - Paz-Chinchón, F.

AU - Plazas, A. A.

AU - Reichardt, C. L.

AU - Romer, A. K.

AU - Sanchez, E.

AU - Scarpine, V.

AU - Serrano, S.

AU - Sevilla-Noarbe, I.

AU - Singh, P.

AU - Smith, M.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Thomas, D.

AU - To, C.

AU - Weller, J.

AU - Wilkinson, R. D.

AU - Wu, H.

PY - 2021/6/1

Y1 - 2021/6/1

N2 - 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 but a natural target for SPT-3G and eROSITA.

AB - 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 but a natural target for SPT-3G and eROSITA.

KW - galaxies: clusters: general

KW - large-scale structure of Universe

KW - methods: statistical

UR - http://www.scopus.com/inward/record.url?scp=85107849742&partnerID=8YFLogxK

U2 - 10.1093/mnras/stab869

DO - 10.1093/mnras/stab869

M3 - Article

AN - SCOPUS:85107849742

SN - 0035-8711

VL - 504

SP - 1253

EP - 1272

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters

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