| Title: |
Optical-SZE Scaling Relations for DES Optically Selected Clusters within the SPT-SZ Survey |
| Authors: |
Saro, A; Bocquet, S; Mohr, J; Rozo, E; Benson, BA; Dodelson, S; Rykoff, ES; Bleem, L; Abbott, TMC; Abdalla, FB; Allen, S; Annis, J; Benoit-Levy, A; Brooks, D; Burke, DL; Capasso, R; Rosell, AC; Kind, MC; Carretero, J; Chiu, I; Crawford, TM; Cunha, CE; D'Andrea, CB; Costa, LND; Desai, S; Dietrich, JP; Evrard, AE; Neto, AF; Flaugher, B; Fosalba, P; Frieman, J; Gangkofner, C; Gaztanaga, E; Gerdes, DW; Giannantonio, T; Grandis, S; Gruen, D; Gruendl, RA; Gupta, N; Gutierrez, G; Holzapfel, WL; James, DJ; Kuehn, K; Kuropatkin, N; Lima, M; Marshall, JL; McDonald, M; Melchior, P; Menanteau, F; Miquel, R; Ogando, R; Plazas, AA; Rapetti, D; Reichardt, CL; Reil, K; Romer, AK; Sanchez, E; Scarpine, V; Schubnell, M; Sevilla-Noarbe, I; Smith, RC; Soares-Santos, M; Soergel, B; Strazzullo, V; Suchyta, E; Swanson, MEC; Tarle, G; Thomas, D; Vikram, V; Walker, AR; Zenteno, A |
| Source: |
Monthly Notices of the Royal Astronomical Society , 468 (3) pp. 3347-3360. (2017) |
| Publication Year: |
2017 |
| Collection: |
University College London: UCL Discovery |
| Subject Terms: |
Methods: observational; methods: statistical; galaxies: abundances; galaxies: clusters: general; large-scale structure of Universe |
| Description: |
We study the Sunyaev-Zel'dovich effect (SZE) signature in South Pole Telescope (SPT) data for an ensemble of 719 optically identified galaxy clusters selected from 124.6 deg$^2$ of the Dark Energy Survey (DES) science verification data, detecting a stacked SZE signal down to richness $\lambda\sim20$. The SZE signature is measured using matched-filtered maps of the 2500 deg$^2$ SPT-SZ survey at the positions of the DES clusters, and the degeneracy between SZE observable and matched-filter size is broken by adopting as priors SZE and optical mass-observable relations that are either calibrated using SPT selected clusters or through the Arnaud et al. (2010, A10) X-ray analysis. We measure the SPT signal to noise $\zeta$-$\lambda$, relation and two integrated Compton-$y$ $Y_\textrm{500}$-$\lambda$ relations for the DES-selected clusters and compare these to model expectations accounting for the SZE-optical center offset distribution. For clusters with $\lambda > 80$, the two SPT calibrated scaling relations are consistent with the measurements, while for the A10-calibrated relation the measured SZE signal is smaller by a factor of $0.61 \pm 0.12$ compared to the prediction. For clusters at $20 < \lambda < 80$, the measured SZE signal is smaller by a factor of $\sim$0.20-0.80 (between 2.3 and 10~$\sigma$ significance) compared to the prediction, with the SPT calibrated scaling relations and larger $\lambda$ clusters showing generally better agreement. We quantify the required corrections to achieve consistency, showing that there is a richness dependent bias that can be explained by some combination of contamination of the observables and biases in the estimated masses. We discuss possible physical effects, as contamination from line-of-sight projections or from point sources, larger offsets in the SZE-optical centering or larger scatter in the $\lambda$-mass relation at lower richnesses. |
| Document Type: |
article in journal/newspaper |
| File Description: |
text |
| Language: |
English |
| Relation: |
https://discovery.ucl.ac.uk/id/eprint/1540495/1/Abdalla_stx594.pdf; https://discovery.ucl.ac.uk/id/eprint/1540495/ |
| Availability: |
https://discovery.ucl.ac.uk/id/eprint/1540495/1/Abdalla_stx594.pdf; https://discovery.ucl.ac.uk/id/eprint/1540495/ |
| Rights: |
open |
| Accession Number: |
edsbas.FC80507 |
| Database: |
BASE |