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Galaxy clusters as cosmological probes: calibration of the mass-richness relation

Grant number: 16/17271-5
Support type:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): January 16, 2017
Effective date (End): January 15, 2018
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
Principal researcher:Marcos Vinicius Borges Teixeira Lima
Grantee:Vinicius Consolini Busti
Supervisor abroad: Bhuvnesh Jain
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: University of Pennsylvania, United States  
Associated to the scholarship:14/21098-1 - Precision cosmology with the Dark Energy Survey, BP.PD


Galaxy clusters probe the high-end limit of the halo mass function, where their abundance is very sensitive to how structures formed in the Universe and therefore to cosmological parameters. In order to take full advantage of these objects, one must connect the observed cluster richness, i.e. the number of galaxies in a cluster, with the mass of the halo where the cluster resides. This is known as the mass-richness relation. Its measurement or calibration is paramount to derive robust cosmological constraints and constitutes the main goal of this project. We shall use the high-redshift coverage (z ~ 1) and wide area (5,000 deg squared) of the Dark Energy Survey (DES) to calibrate the mass-richness relation and use it to derive the most stringent limits on cosmological parameters from optical galaxy clusters. Three different methods will be used to calibrate the mass-richness relation, using the angular correlation function of galaxy clusters, the projected correlation function of galaxy clusters and the weak lensing effect that galaxy clusters induce on background galaxies. Each method possesses its own systematic errors, which will be characterized, allowing for a comparison of the multiple results. All the methods will be carefully validated through simulations provided by DES, first in the dark matter halos and then for galaxy clusters detected in simulations, hence allowing us to understand the cluster finder properties. Finally, the methods will be applied on the data from the first year (Y1) and second/third years (Y3) releases, with the aim of obtaining constraints to the mass-richness relation and a thorough understanding of the analysis, which will pave the way for the Y5 final data release and future surveys. (AU)

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Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VELTEN, HERMANO; GOMES, SYRIOS; BUSTI, VINICIUS C. Gauging the cosmic acceleration with recent type Ia supernovae data sets. Physical Review D, v. 97, n. 8 APR 23 2018. Web of Science Citations: 4.
HOLANDA, R. F. L.; SILVA, KAMILLA V. R. A.; BUSTI, V. C. X-ray surface brightness observations of galaxy clusters, cosmic opacity and the limits on the matter density parameter. Journal of Cosmology and Astroparticle Physics, n. 3 MAR 2018. Web of Science Citations: 1.
HOLANDA, R. F. L.; BUSTI, V. C.; GONZALEZ, J. E.; ANDRADE-SANTOS, F.; ALCANIZ, J. S. Cosmological constraints on the gas depletion factor in galaxy clusters. Journal of Cosmology and Astroparticle Physics, n. 11 DEC 2017. Web of Science Citations: 1.
HOLANDA, R. F. L.; PEREIRA, S. H.; BUSTI, V. C.; BESSA, C. H. G. Improved constraints on violations of the Einstein equivalence principle in the electromagnetic sector with complementary cosmic probes. Classical and Quantum Gravity, v. 34, n. 19 OCT 5 2017. Web of Science Citations: 2.
HOLANDA, R. F. L.; BUSTI, V. C.; LIMA, F. S.; ALCANIZ, J. S. Probing the distance-duality relation with high-z data. Journal of Cosmology and Astroparticle Physics, n. 9 SEP 2017. Web of Science Citations: 5.

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