Résumé / Abstract Journal-club_Doctorants

Séminaire Doctoral / Seminar PhD

« Thermal Sunyaev-Zeldovich power spectrum: analytical model and measures in simulations »

Emma Ayçoberry
Institut d'Astrophysique de Paris (Paris, France)

The distribution of matter in the Universe is a powerful probe of cosmology.
Measuring the efficiency with which gravity produces clusters against
expending Universe is the key to understanding, e.g. the equation of state
of dark energy. Numerous projects aim at measuring the matter distribution
across time in the Universe but no observable gives the perfect figure of
this distribution (because of instrumental limitation, astrophysical
limitation, or because they probe different redshifts). Cross-correlation
of different probes is a powerful way to lift these limitations. My work
focuses on the construction of a robust halo model for the thermal
Sunyaev-Zeldovich power spectrum (one such tracer of the LSS) and to
cross-correlate it with different probes of the distribution of matter
(lensing, CMB lensing, galaxy count,…). To do so, I work with an
analytical halo model of this power spectrum and I measure different
profiles and power spectrums in the Horizon-AGN simulation to compare both
and to test hypothesis of the model, such as as the pressure profiles in
halos and their link with feedback. In this talk I will thus present and
comment my results on these comparison.
vendredi 7 avril 2023 - 16:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique
Page web du séminaire / Seminar's webpage