I am working on understanding the absorption profiles observed in the spectra of quasars. Quasars are very bright objects which means that we can observe them from very far away, more than 13 billion years ago in fact or beyond redshift 5. As the light emitted by these bright objects traverses the Universe it passes between galaxies and interacts with the matter in the Inter Galactic Medium, IGM for short. This interaction creates absorption profiles that can tell us about the stars which have "polluted" the IGM.
By putting a lot of these observations together and by studying the relative strengths of different ionization states of Carbon, Oxygen, Silicon and other metals, I will better constrain the stellar population models and their number density in order to better understand the process of reionization of cosmic hydrogen.
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