Measuring the Clustering of tSZ-Selected Galaxy Clusters with SPT-3G
Abstract
We present a measurement of the spatial clustering of galaxy clusters selected via the thermal Sunyaev-Zel'dovich (tSZ) signal. Using a cluster catalog derived from five years of SPT-3G Main field survey data, we define a sample spanning 0.25 < z < 1.1, as well as two subsamples spanning 0.25 < z < 0.67 and 0.67 < z < 1.1. We detect cluster clustering at 12.8σ, the highest significance detection in a tSZ-selected sample to date. We detail our analytic modeling and theoretical covariance models, including validations performed on synthetic data created from numerical simulations. The measurements and inference pass a variety of null tests, and show minimal sensitivity to common spatially varying systematics that impact optical clustering measurements, such as depth, stellar density, and extinction. We use our pipeline to place constraints on the halo bias of our sample, bh = 5.30±0.24, and the normalization of our mass-observable relation, lnAsz = 0.43+0.17−0.21. We also demonstrate the useful synergies between cluster clustering and abundance measurements, which manifest in the breaking of high-dimensional parameter degeneracies. Samples of clusters selected using the tSZ effect serve as a unique probe of clustering that is insensitive to common systematics, relative to conventional galaxy datasets, and the detection significance of this measurement will increase substantially with existing data from the SPT-3G Ext-10k survey and upcoming data from SPT-3G+ and the Simons Observatory.
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BibTeX
@misc{martsen2026measuring,
title = {{Measuring the Clustering of tSZ-Selected Galaxy Clusters with SPT-3G}},
author = {E.S Martsen and D Anbajagane and L.E Bleem and B.A Benson and E Anderes and A.J Anderson and B Ansarinejad and M Archipley and L Balkenhol and D.R Barron and P.S Barry and K Benabed and A.N Bender and F Bianchini and S Bocquet and F.R Bouchet and E Camphuis and M.G Campitiello and J.E Carlstrom and J Carron and C.L Chang and P.M Chichura and A Chokshi and T.-L Chou and A Coerver and T.M Crawford and C Daley and T de Haan and K.R Dibert and M.A Dobbs and M Doohan and D Dutcher and C Feng and K.R Ferguson and N.C Ferree and K Fichman and A Foster and N Frontiere and S Galli and A.E Gambrel and A.K Gao and F Ge and S Gradis and F Guidi and S Guns and N.W Halverson and E Hivon and G.P Holder and W.L Holzapfel and J.C Hood and A Hryciuk and N Huang and T Jhaveri and F Kéruzoré and A.R Khalife and M Klein and L Knox and K Kornoelje and C.-L Kuo and P Larsen},
howpublished = {HAL},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.08947},
eprint = {2610.08947},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05835162v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Measuring the Clustering of tSZ-Selected Galaxy Clusters with SPT-3G
AU - E.S Martsen
AU - D Anbajagane
AU - L.E Bleem
AU - B.A Benson
AU - E Anderes
AU - A.J Anderson
AU - B Ansarinejad
AU - M Archipley
AU - L Balkenhol
AU - D.R Barron
AU - P.S Barry
AU - K Benabed
AU - A.N Bender
AU - F Bianchini
AU - S Bocquet
AU - F.R Bouchet
AU - E Camphuis
AU - M.G Campitiello
AU - J.E Carlstrom
AU - J Carron
AU - C.L Chang
AU - P.M Chichura
AU - A Chokshi
AU - T.-L Chou
AU - A Coerver
AU - T.M Crawford
AU - C Daley
AU - T de Haan
AU - K.R Dibert
AU - M.A Dobbs
AU - M Doohan
AU - D Dutcher
AU - C Feng
AU - K.R Ferguson
AU - N.C Ferree
AU - K Fichman
AU - A Foster
AU - N Frontiere
AU - S Galli
AU - A.E Gambrel
AU - A.K Gao
AU - F Ge
AU - S Gradis
AU - F Guidi
AU - S Guns
AU - N.W Halverson
AU - E Hivon
AU - G.P Holder
AU - W.L Holzapfel
AU - J.C Hood
AU - A Hryciuk
AU - N Huang
AU - T Jhaveri
AU - F Kéruzoré
AU - A.R Khalife
AU - M Klein
AU - L Knox
AU - K Kornoelje
AU - C.-L Kuo
AU - P Larsen
PY - 2026
DA - 2026/10/06
PB - HAL
DO - 10.48550/arxiv.2610.08947
UR - https://hal.science/hal-05835162v1
AB - We present a measurement of the spatial clustering of galaxy clusters selected via the thermal Sunyaev-Zel'dovich (tSZ) signal. Using a cluster catalog derived from five years of SPT-3G Main field survey data, we define a sample spanning 0.25 < z < 1.1, as well as two subsamples spanning 0.25 < z < 0.67 and 0.67 < z < 1.1. We detect cluster clustering at 12.8σ, the highest significance detection in a tSZ-selected sample to date. We detail our analytic modeling and theoretical covariance models, including validations performed on synthetic data created from numerical simulations. The measurements and inference pass a variety of null tests, and show minimal sensitivity to common spatially varying systematics that impact optical clustering measurements, such as depth, stellar density, and extinction. We use our pipeline to place constraints on the halo bias of our sample, b_h = 5.30±0.24, and the normalization of our mass-observable relation, lnA_sz = 0.43^+0.17_−0.21. We also demonstrate the useful synergies between cluster clustering and abundance measurements, which manifest in the breaking of high-dimensional parameter degeneracies. Samples of clusters selected using the tSZ effect serve as a unique probe of clustering that is insensitive to common systematics, relative to conventional galaxy datasets, and the detection significance of this measurement will increase substantially with existing data from the SPT-3G Ext-10k survey and upcoming data from SPT-3G+ and the Simons Observatory.
ER -