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Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters

Research output: Contribution to journalArticle

  • A. Saro
  • S. Bocquet
  • E. Rozo
  • B. A. Benson
  • J. Mohr
  • E. S. Rykoff
  • M. Soares-Santos
  • L. Bleem
  • S. Dodelson
  • P. Melchior
  • F. Sobreira
  • V. Upadhyay
  • J. Weller
  • T. Abbott
  • F. B. Abdalla
  • S. Allam
  • R. Armstrong
  • M. Banerji
  • A. H. Bauer
  • M. Bayliss
  • A. Benoit-Levy
  • G. M. Bernstein
  • E. Bertin
  • M. Brodwin
  • D. Brooks
  • E. Buckley-Geer
  • D. L. Burke
  • J. E. Carlstrom
  • R. Capasso
  • D. Capozzi
  • A. Carnero Rosell
  • M. Carrasco Kind
  • I. Chiu
  • R. Covarrubias
  • T. M. Crawford
  • M. Crocce
  • C. B. D'Andrea
  • L. N. da Costa
  • D. L. DePoy
  • S. Desai
  • T. de Haan
  • H. T. Diehl
  • J. P. Dietrich
  • P. Doel
  • C. E Cunha
  • T. F. Eifler
  • A. E. Evrard
  • A. Fausti Neto
  • E. Fernandez
  • B. Flaugher
  • P. Fosalba
  • J. Frieman
  • C. Gangkofner
  • E. Gaztanaga
  • D. Gerdes
  • D. Gruen
  • R. A. Gruendl
  • N. Gupta
  • C. Hennig
  • W. L. Holzapfel
  • K. Honscheid
  • B. Jain
  • D. James
  • K. Kuehn
  • N. Kuropatkin
  • O. Lahav
  • T. S. Li
  • H. Lin
  • M. A. G. Maia
  • M. March
  • J. L. Marshall
  • Paul Martini
  • M. McDonald
  • C. J. Miller
  • R. Miquel
  • B. Nord
  • R. Ogando
  • A. A. Plazas
  • C. L. Reichardt
  • A. K. Romer
  • A. Roodman
  • M. Sako
  • E. Sanchez
  • M. Schubnell
  • I. Sevilla
  • R. C. Smith
  • B. Stalder
  • A. A. Stark
  • V. Strazzullo
  • E. Suchyta
  • M. E. C. Swanson
  • G. Tarle
  • J. Thaler
  • D. Tucker
  • V. Vikram
  • A. von der Linden
  • A. R. Walker
  • R. H. Wechsler
  • W. Wester
  • A. Zenteno
  • K. E. Ziegler
We cross-match galaxy cluster candidates selected via their Sunyaev-Zel'dovich effect (SZE) signatures in 129.1 deg$^2$ of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey (DES) science verification data. We identify 25 clusters between $0.1\lesssim z\lesssim 0.8$ in the union of the SPT-SZ and redMaPPer (RM) samples. RM is an optical cluster finding algorithm that also returns a richness estimate for each cluster. We model the richness $\lambda$-mass relation with the following function $\langle\ln\lambda|M_{500}\rangle\propto B_\lambda\ln M_{500}+C_\lambda\ln E(z)$ and use SPT-SZ cluster masses and RM richnesses $\lambda$ to constrain the parameters. We find $B_\lambda= 1.14^{+0.21}_{-0.18}$ and $C_\lambda=0.73^{+0.77}_{-0.75}$. The associated scatter in mass at fixed richness is $\sigma_{\ln M|\lambda} = 0.18^{+0.08}_{-0.05}$ at a characteristic richness $\lambda=70$. We demonstrate that our model provides an adequate description of the matched sample, showing that the fraction of SPT-SZ selected clusters with RM counterparts is consistent with expectations and that the fraction of RM selected clusters with SPT-SZ counterparts is in mild tension with expectation. We model the optical-SZE cluster positional offset distribution with the sum of two Gaussians, showing that it is consistent with a dominant, centrally peaked population and a sub-dominant population characterized by larger offsets. We also cross-match the RM catalog with SPT-SZ candidates below the official catalog threshold significance $\xi=4.5$, using the RM catalog to provide optical confirmation and redshifts for additional low-$\xi$ SPT-SZ candidates.In this way, we identify 15 additional clusters with $\xi\in [4,4.5]$ over the redshift regime explored by RM in the overlapping region between DES science verification data and the SPT-SZ survey.
Original languageEnglish
Pages (from-to)2305-2319
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Publication statusPublished - 11 Dec 2015


  • Constraints_on_the_richness_mass_relation

    Rights statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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