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A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid

Abstract : Studying the large-scale structure of the universe is one of the most important elements to understand the origin and evolution of the universe. Galaxy clusters which formed from gravitational collapses in the cosmic density field are the largest gravitationally bound structures. Using the two-point correlation we can quantify the clustering of galaxy clusters in both spatial and angular scales. Many galaxy surveys have been carried out for similar purpose. The Planck Sunyaev-Zel’dovich (SZ) cluster catalog contains sources detected through the SZ effect from the 29-month full sky Planck mission. This is the largest SZ cluster catalog and it covers about 85% of the sky. In this thesis, we investigate the angular two-point correlation function w(��) of the Planck SZ cluster catalog. We obtained an indication of clustering signal of Planck clusters with redshift smaller than 0.4 and signal-to-noise ratio SNR ≥ 6. We detected a significant clustering signal of clusters with redshift z < 0.2 and SNR ≥ 6. The correlation of Planck SZ clusters turns out quite compatible with our prediction. We also explore the potential of the two-point correlation function ξ(r) of the Euclid Flagship simulation dark matter halo catalog. Euclid is a space mission under development to study dark energy and dark matter by measuring the accelerated expansion of the universe. We found that the correlation of Flagship simulation dark matter halos evolves with redshift. On scales less than 60 h-1 Mpc, the correlation of dark matter halo is well fitted by a power law with a correlation length from 16 to 19 h−1 Mpc depending on the redshift. We also found the Baryonic Acoustic Oscillations (BAO) signature in the groups with redshift z > 0.2. Furthermore, we found the halo bias, which can be used as a tracer of dark matter and which also evolves with redshift. Finally, we also show the results of the validation of external simulation data in the context of Science Challenge 3 of Euclid consortium. In this part, we present methods to measure the photometry, the astronomical tools to measure astrometry, extract objects from astronomical image.
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Submitted on : Wednesday, May 20, 2020 - 4:23:46 PM
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van Tuan Bui. A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid. Physics [physics]. Université Sorbonne Paris Cité, 2019. English. ⟨NNT : 2019USPCC022⟩. ⟨tel-02614091⟩



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