CFHT UM2019 - Presentation Details

Abstract Details

Title: Mining and mapping the first generations of stars with the Pristine CaH&K survey at CFHT

Presenter: Nicolas Martin


I will present the ongoing Pristine survey, a Franco-Canadian photometric survey of the Milky Way halo performed with the new CaHK filter on CFHT's MegaCam. Currently covering ~5,000 deg^2, this survey leads to an efficient metallicity decomposition of the Milky Way halo. In particular, I will show how efficient Pristine is in selecting the metal-poor end of the metallicity distribution ([Fe/H]<-2.5) to hunt for the very rare extremely metal-poor stars (bearer of the chemical imprint of the first stars). Our spectroscopic follow-up campaign shows Pristine is very efficient at selecting very metal-poor stars from our photometry alone and we are building a large and unique sample of these stars. A dedicated part of the survey also focuses on the enigmatic very faint (and therefore metal-poor) Milky Way dwarf galaxies found over the last decade. I will show how efficient Pristine is at isolating likely member stars and how it opens a well-needed window onto the detailed study of these systems that are often used as near-field cosmological probes.