Optical–SZE scaling relations for DES optically selected clusters within the SPT-SZ survey

Journal Article · Wed Mar 15 00:00:00 EDT 2017 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stx594· OSTI ID:1369256

Saro, A.; Bocquet, S.; Mohr, J.; Rozo, E.; Benson, B. A.; Dodelson, S.; Rykoff, E. S.; Bleem, L.; Abbott, T. M. C.; Abdalla, F. B.; Allen, S.; Annis, J.; Benoit-Lévy, A.; Brooks, D.; Burke, D. L.; Capasso, R.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Chiu, I. ; Crawford, T. M.; Cunha, C. E.; D'Andrea, C. B.; da Costa, L. N.; Desai, S.; Dietrich, J. P.; Evrard, A. E.; Neto, A. Fausti; Flaugher, B.; Fosalba, P.; Frieman, J.; Gangkofner, C.; Gaztanaga, E.; Gerdes, D. W.; Giannantonio, T.; Grandis, S.; Gruen, D.; Gruendl, R. A.; Gupta, N.; Gutierrez, G.; Holzapfel, W. L.; James, D. J.; Kuehn, K.; Kuropatkin, N.; Lima, M.; Marshall, J. L.; McDonald, M.; Melchior, P.; Menanteau, F.; Miquel, R.; Ogando, R.; Plazas, A. A.; Rapetti, D.; Reichardt, C. L.; Reil, K.; Romer, A. K.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, R. C.; Soares-Santos, M.; Soergel, B.; Strazzullo, V.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; Vikram, V.; Walker, A. R.; Zenteno, A.

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.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: DES
• Grant/Contract Number: AC02-76SF00515; AC02-07CH11359
• OSTI ID: 1369256
• Alternate ID(s): OSTI ID: 1294435
• Report Number(s): DES-2014-0015; FERMILAB-PUB-16-132-E; arXiv:1605.08770; DES-2014-0015-FERMILAB-PUB-16-132-E; TRN: US1702464
• Journal Information: Monthly Notices of the Royal Astronomical Society, Vol. 468, Issue 3; ISSN 0035-8711
• Publisher: Royal Astronomical Society
• Country of Publication: United States
• Language: English

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79 ASTRONOMY AND ASTROPHYSICS
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methods: statistical
galaxies: abundances
galaxies: clusters: general
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