Probing gravity with the DES-CMASS sample and BOSS spectroscopy

(DES Collaboration), S. Lee*, E. M. Huff, A. Choi, J. Elvin-Poole, C. Hirata, K. Honscheid, N. MacCrann, A. J. Ross, M. A. Troxel, T. F. Eifler, H. Kong, A. Ferté, J. Blazek, D. Huterer, A. Amara, A. Campos, A. Chen, S. Dodelson, P. LemosC. D. Leonard, V. Miranda, J. Muir, M. Raveri, L. F. Secco, N. Weaverdyck, J. Zuntz, S. L. Bridle, C. Davis, J. DeRose, M. Gatti, J. Prat, M. M. Rau, S. Samuroff, C. Sánchez, P. Vielzeuf, M. Aguena, S. Allam, A. Amon, F. Andrade-Oliveira, G. M. Bernstein, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, R. Cawthon, C. Conselice, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, J. P. Dietrich, P. Doel, S. Everett, A. E. Evrard, I. Ferrero, P. Fosalba, J. Frieman, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, T. Giannantonio, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, W. G. Hartley, S. R. Hinton, D. L. Hollowood, B. Hoyle, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, M. March, J. L. Marshall, F. Menanteau, R. Miquel, J. J. Mohr, R. Morgan, A. Palmese, F. Paz-Chinchón, A. Pieres, A. A. Plazas Malagón, A. Roodman, E. Sanchez, V. Scarpine, M. Schubnell, S. Serrano, I. Sevilla-Noarbe, E. Sheldon, M. Smith, E. Suchyta, M. E. C. Swanson, G. Tarle, D. Thomas, C. To, T. N. Varga, J. Weller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The DES-CMASS sample (DMASS) is designed to optimally combine the weak lensing measurements from the Dark Energy Survey (DES) and redshift-space distortions (RSD) probed by the CMASS galaxy sample from the Baryonic Oscillation Spectroscopic Survey. In this paper, we demonstrate the feasibility of adopting DMASS as the equivalent of CMASS for a joint analysis of DES and BOSS in the framework of modified gravity. We utilize the angular clustering of the DMASS galaxies, cosmic shear of the DES metacalibration sources, and cross-correlation of the two as data vectors. By jointly fitting the combination of the data with the RSD measurements from the CMASS sample and Planck data, we obtain the constraints on modified gravity parameters μ0=−0.37+0.47−0.45 and Σ0=0.078+0.078−0.082⁠. Our constraints of modified gravity with DMASS are tighter than those with the DES Year 1 redMaGiC sample with the same external data sets by 29 per cent for μ0 and 21 per cent for Σ0, and comparable to the published results of the DES Year 1 modified gravity analysis despite this work using fewer external data sets. This improvement is mainly because the galaxy bias parameter is shared and more tightly constrained by both CMASS and DMASS, effectively breaking the degeneracy between the galaxy bias and other cosmological parameters. Such an approach to optimally combine photometric and spectroscopic surveys using a photometric sample equivalent to a spectroscopic sample can be applied to combining future surveys having a limited overlap such as DESI and LSST.
Original languageEnglish
Pages (from-to)49982-4996
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume509
Issue number4
Early online date10 Nov 2021
DOIs
Publication statusPublished - 1 Feb 2022

Keywords / Materials (for Non-textual outputs)

  • astro-ph.CO

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