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Monday, September 2nd at 12:00 EEST
Dr. Alexis Finoguenov (University of Helsinki, Finland)
Constraining AGN feedback with Euclid Cosmology
Abstract: A new generation of experiments designed to bring our understanding of dark matter and dark energy to a new level is gaining momentum. The Euclid satellite mission in particular maps the dark matter distribution in the Universe to an unprecedented accuracy, using the gravitational lensing effect of its mass on the shapes of observed galaxy images, and measures its expansion history using galaxy redshift measurements. Its results enable stringent tests of the cosmological concordance model, including possible time evolution of dark energy and the validity of general relativity on cosmological scales. The high precision of Euclid measurements will be sensitive to detailed processes associated with galaxy formation, including the growth of black holes and their feedback. Baryonic feedback processes, either SNe or AGN redistribute the gas, which changes the matter power spectrum, in particular on scales where the sensitivity of cosmic shear is maximal. The way forward is to constrain feedback directly and update its implementation in models. Although a seemingly impossible task, it has been demonstrated that the importance of the feedback effect on the shear signal can be mapped to the baryonic fraction of galaxy groups in all recent simulations. I will present the Large XMM-Newton program, X-GAP, designed to address AGN feedback in galaxy groups and discuss its first, rather remarkable, results.
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