Séminaires
Galaxy formation/evolution with panchromatic imaging Surveys
par
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Europe/Paris
Amphithéâtre (CPPM)
Amphithéâtre
CPPM
Description
Galaxy formation models rely on the hierarchical Lambda-CDM framework that governs the growth of the dark matter structures and the complex baryonic physics inside the dark matter halos (gas accretion, star formation, feedbacks, etc...). Large imaging surveys allows us to explore the connection between the DM haloes and the galaxies via, for exemple, galaxy clustering, weak lensing analysis or the evolution of the stellar mass functions and all combined provide insights about the efficiency to convert gas into stars on both ends of the DMH mass function.
While most of the previous analysis has been done with deep fields (approx. sq. degree size), severely affected by cosmic variance, I will present new results collected from our wide multi-wavelength survey (22 deg^2, from UV to NearIR) and overlapping the VIPERS spectroscopic survey. With its unique volume, 0.2 Gpc^3 (z<1.5), robust photometric redshifts and stellar masses we have obtained - new measurements of the stellar-to-halo mass relationship (SHMR) over an unprecedented mass range for both central and satellite galaxies - first time constraints on the evolution of the massive end (M 10^10.5 Mo) of the stellar mass functions up to approximative z of 1.5, a critical test for the hierarchical models and the numerous scenarios proposed to stop the star formation in massive haloes - evidences for two quenching channels for star-forming galaxies depending on their stellar masses and involving different quenching timescales. Those channels can be directly related to the mass vs environmental quenching scenarios, recently proposed by Peng et al. Despite its modest size, we show that our survey is already dominated by systematic uncertainties and we emphasize the importance of controling such systematics to fully exploit the future imaging surveys (HSC, LSST, Euclid, ...).
I will conclude with some perspectives offer by the combination of large imaging and spectroscopic surveys (such as HSC + PFS, LSST + Euclid, ...) to extend the analysis of galaxy environment to the highly anisotropic cosmic web environment, a promising metric to explore galaxy evolution.