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Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2021

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

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

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 $\hat{\lambda } 40$ 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 ${}12{{\ \rm per\ cent}}$ (97.5 percentile) of the total population. Extrapolating this to a measured richness $\hat{\lambda }=20$ yields ${}22{{\ \rm per\ cent}}$ (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.
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Dates and versions

insu-03748203 , version 1 (09-08-2022)

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S. Grandis, J. J. Mohr, M. Costanzi, A. Saro, S. Bocquet, et al.. Exploring the contamination of the DES-Y1 cluster sample with SPT-SZ selected clusters. Monthly Notices of the Royal Astronomical Society, 2021, 504, pp.1253-1272. ⟨10.1093/mnras/stab869⟩. ⟨insu-03748203⟩
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