Constraints on the Richness-Mass Relation and the Optical-SZE Positional Offset Distribution for SZE-Selected Clusters
Creators: name: Saro, A.
name: Bocquet, S.
name: Rozo, E.
name: Benson, B. A.
name: Mohr, J.
name: Rykoff, E. S.
name: Soares-Santos, M.
name: Bleem, L.
name: Dodelson, S.
name: Melchior, P.
name: Sobreira, F.
name: Upadhyay, V.
name: Weller, J.
name: Abbott, T.
name: Abdalla, F. B.
name: Allam, S.
name: Armstrong, R.
name: Banerji, M.
name: Bauer, A. H.
name: Bayliss, M.
name: Benoit-Levy, A.
name: Bernstein, G. M.
name: Bertin, E.
name: Brodwin, M.
name: Brooks, D.
name: Buckley-Geer, E.
name: Burke, D. L.
name: Carlstrom, J. E.
name: Capasso, R.
name: Capozzi, D.
name: Rosell, A. Carnero
name: Kind, M. Carrasco
name: Chiu, I.
name: Covarrubias, R.
name: Crawford, T. M.
name: Crocce, M.
name: D'Andrea, C. B.
name: da Costa, L. N.
name: DePoy, D. L.
name: Desai, S.
name: de Haan, T.
name: Diehl, H. T.
name: Dietrich, J. P.
name: Doel, P.
name: Cunha, C. E
name: Eifler, T. F.
name: Evrard, A. E.
name: Neto, A. Fausti
name: Fernandez, E.
name: Flaugher, B.
name: Fosalba, P.
name: Frieman, J.
name: Gangkofner, C.
name: Gaztanaga, E.
name: Gerdes, D.
name: Gruen, D.
name: Gruendl, R. A.
name: Gupta, N.
name: Hennig, C.
name: Holzapfel, W. L.
name: Honscheid, K.
name: Jain, B.
name: James, D.
name: Kuehn, K.
name: Kuropatkin, N.
name: Lahav, O.
name: Li, T. S.
name: Lin, H.
name: Maia, M. A. G.
name: March, M.
name: Marshall, J. L.
name: Martini, Paul
name: McDonald, M.
name: Miller, C. J.
name: Miquel, R.
name: Nord, B.
name: Ogando, R.
name: Plazas, A. A.
name: Reichardt, C. L.
name: Romer, A. K.
name: Roodman, A.
name: Sako, M.
name: Sanchez, E.
name: Schubnell, M.
name: Sevilla, I.
name: Smith, R. C.
name: Stalder, B.
name: Stark, A. A.
name: Strazzullo, V.
name: Suchyta, E.
name: Swanson, M. E. C.
name: Tarle, G.
name: Thaler, J.
name: Thomas, D.
name: Tucker, D.
name: Vikram, V.
name: von der Linden, A.
name: Walker, A. R.
name: Wechsler, R. H.
name: Wester, W.
name: Zenteno, A.
name: Ziegler, K. E.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $λ$-mass relation with the following function $\langle\lnλ|M_{500}\rangle\propto B_λ\ln M_{500}+C_λ\ln E(z)$ 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 sub-dominant population characterized by larger offsets. We also cross-match the RM catalog with SPT-SZ candidates below the official catalog threshold significance $ξ=4.5$, using the RM catalog to provide optical confirmation and redshifts for additional low-$ξ$ SPT-SZ candidates.In this way, we identify 15 additional clusters with $ξ\in [4,4.5]$ over the redshift regime explored by RM in the overlapping region between DES science verification data and the SPT-SZ survey.
description: 15 pages, 8 Figures, submitted to MNRAS