IRAP > Séminaires > Calendrier des séminaires > Quasar clustering analysis with SDSS-IV eBOSS

Quasar clustering analysis with SDSS-IV eBOSS

Séminaire exceptionnel le 05 mars 2018 de 11h00 à 12h00

Intervenant : Pauline Zarrouk

CEA-Saclay

Salle Coriolis Salle Coriolis Observatoire Midi-Pyrénées - 14, avenue Edouard Belin - 31400 Toulouse

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The SDSS-IV eBOSS spectrograph has undertaken a survey of quasars in the almost unexplored redshift range 0.8 < z < 2.2 in the fall 2014. One of its main goals is to track the BAO signature in the matter distribution, which has been seen in lower redshift galaxies but not yet in quasar samples, and also to measure the growth rate of structure, which has been proved to provide a direct test of general relativity. Such a clustering analysis is essential to study the mysterious late-time acceleration of the expansion of the universe called dark energy, which could be an exotic fluid whose properties have to be determined or come from a breakdown of general relativity on cosmological scales. Thus, anisotropic clustering has received much attention from multi-object spectrographs in the last decade at low redshifts. At larger redshift (z > 1), there is a strong interest to use quasars that are among the brightest sources in the universe to trace the matter density field and probe an epoch when the Universe was not yet dominated by its late-time cosmic acceleration. In this talk, I will present the anisotropic clustering analysis we performed on the 2-year data taking eBOSS DR14 quasar sample ( https://arxiv.org/abs/1801.03062), the study of potential systematics we validated using mock catalogs and the first cosmological measurements we get with this new sample.

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