Dark energy survey year 3 results: Cosmology with peaks using an emulator approach

Journal Article · Wed Jan 19 00:00:00 EST 2022 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stac078· OSTI ID:1844817

Zürcher, D. ; Fluri, J.; Sgier, R.; Kacprzak, T.; Gatti, M.; Doux, C. ; Whiteway, L.; Réfrégier, A.; Chang, C. ; Jeffrey, N. ; Jain, B.; Lemos, P. ; Bacon, D. ; Alarcon, A.; Amon, A.; Bechtol, K.; Becker, M.; Bernstein, G.; Campos, A.; Chen, R. ; Choi, A.; Davis, C.; Derose, J.; Dodelson, S.; Elsner, F.; Elvin-Poole, J.; Everett, S.; Ferte, A.; Gruen, D.; Harrison, I.; Huterer, D.; Jarvis, M.; Leget, P. F.; Maccrann, N.; Mccullough, J.; Muir, J.; Myles, J.; Navarro Alsina, A.; Pandey, S.; Prat, J.; Raveri, M.; Rollins, R. P.; Roodman, A.; Sanchez, C.; Secco, L. F.; Sheldon, E.; Shin, T.; Troxel, M.; Tutusaus, I.; Yin, B.; Aguena, M.; Allam, S.; Andrade-Oliveira, F.; Annis, J.; Bertin, E.; Brooks, D.; Burke, D.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F.; Cawthon, R.; Conselice, C.; Costanzi, M.; da Costa, L.; da Silva Pereira, M. E.; Davis, T.; De Vicente, J.; Desai, S.; Diehl, H. T.; Dietrich, J.; Doel, P.; Eckert, K.; Evrard, A.; Ferrero, I.; Flaugher, B.; Fosalba, P.; Friedel, D.; Frieman, J.; Garcia-Bellido, J.; Gaztanaga, E.; Gerdes, D.; Giannantonio, T.; Gruendl, R.; Gschwend, J.; Gutierrez, G.; Hinton, S.; Hollowood, D. L.; Honscheid, K.; Hoyle, B.; James, D.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Lidman, C.; Lima, M.; Maia, M.; Marshall, J.; Melchior, P.; Menanteau, F.; Miquel, R.; Morgan, R.; Palmese, A.; Paz-Chinchon, F.; Pieres, A.; Plazas Malagón, A.; Reil, K.; Rodriguez Monroy, M.; Romer, K.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Serrano, S.; Sevilla, I.; Smith, M.; Suchyta, E.; Tarle, G.; Thomas, D.; To, C.; Varga, T. N.; Weller, J.; Wilkinson, R.

In this work, we constrain the matter density Ω_m and the amplitude of density fluctuations σ₈ within the ΛCDM cosmological model with shear peak statistics and angular convergence power spectra using mass maps constructed from the first three years of data of the Dark Energy Survey (DES Y3). We use tomographic shear peak statistics, including cross-peaks: peak counts calculated on maps created by taking a harmonic space product of the convergence of two tomographic redshift bins. Our analysis follows a forward-modelling scheme to create a likelihood of these statistics using N-body simulations, using a Gaussian process emulator. We take into account the uncertainty from the remaining, largely unconstrained ΛCDM parameters (Ωb, ns and h). We include the following lensing systematics: multiplicative shear bias, photometric redshift uncertainty, and galaxy intrinsic alignment. Stringent scale cuts are applied to avoid biases from unmodelled baryonic physics. We find that the additional non-Gaussian information leads to a tightening of the constraints on the structure growth parameter yielding $$S_8~\equiv ~\sigma _8\sqrt{\Omega _{\mathrm{m}}/0.3}~=~0.797_{-0.013}^{+0.015}$$ (68 per cent confidence limits), with a precision of 1.8 per cent, an improvement of  38 per cent compared to the angular power spectra only case. The results obtained with the angular power spectra and peak counts are found to be in agreement with each other and no significant difference in S8 is recorded. We find a mild tension of 1.5σ between our study and the results from Planck 2018, with our analysis yielding a lower S₈. Furthermore, we observe that the combination of angular power spectra and tomographic peak counts breaks the degeneracy between galaxy intrinsic alignment A_IA and S₈, improving cosmological constraints. We run a suite of tests concluding that our results are robust and consistent with the results from other studies using DES Y3 data.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Michigan, Ann Arbor, MI (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: DES Collaboration
• Grant/Contract Number: AC02-07CH11359; AC02-76SF00515; AC05-00OR22725; AC02-06CH11357; SC0019193
• OSTI ID: 1844817
• Alternate ID(s): OSTI ID: 1838475; OSTI ID: 1870814; OSTI ID: 1883721; OSTI ID: 1902997; OSTI ID: 1976138
• Report Number(s): FERMILAB-PUB-21-497-AE; arXiv:2110.10135
• Journal Information: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 511 Journal Issue: 2; ISSN 0035-8711
• Publisher: Oxford University Press
• Country of Publication: United Kingdom
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmology
observations