Constraints on the richness-mass relation and the optical-SZE positional offset distribution for SZE-selected clusters
Date Issued
2015
Author(s)
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
•
•
E. Suchyta
•
M. E. C. Swanson
•
G. Tarle
•
J. Thaler
•
D. Thomas
•
D. Tucker
•
V. Vikram
•
A. von der Linden
•
A. R. Walker
•
R. H. Wechsler
•
W. Wester
•
A. Zenteno
•
K. E. Ziegler
Abstract
We cross-match galaxy cluster candidates selected via their Sunyaev-Zel'dovich effect (SZE) signatures in 129.1 deg2 of the South Pole Telescope 2500d SPT-SZ survey with optically identified clusters selected from the Dark Energy Survey science verification data. We identify 25 clusters between 0.1 ≲ z ≲ 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 λ-mass relation with the following function ∝ Bλln M500 + Cλln E(z) and use SPT-SZ cluster masses and RM richnesses λ to constrain the parameters. We find B_λ = 1.14^{+0.21}_{-0.18} and C_λ =0.73^{+0.77}_{-0.75}. The associated scatter in mass at fixed richness is σ _{ln M|λ } = 0.18^{+0.08}_{-0.05} at a characteristic richness λ = 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 subdominant population characterized by larger offsets. We also cross-match the RM catalogue with SPT-SZ candidates below the official catalogue threshold significance ξ = 4.5, using the RM catalogue to provide optical confirmation and redshifts for 15 additional clusters with ξ ∈ [4, 4.5].
Volume
454
Issue
3
Start page
2305
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.454.2305S
Rights
open.access
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