Résumé / Abstract Seminaire_IAP
« Hot halos around high redshift protogalaxies »

Andrew Fox

Damped Lyman alpha (DLA) absorbers are the highest column density class of quasar absorption line systems. DLAs contain the majority of all the neutral gas in the Universe at redshifts 0-5, and likely represent the progenitors to disk galaxies like the Milky Way. In this talk I present a new VLT/UVES absorption line survey for ionized gas in DLAs, including the first detections of O VI absorption. These data show that both warm ionized and hot ionized gas phases are present. I will present measurements of the kinematics of the ionized gas, which suggest that the absorbers trace hot galactic outflows and/or the infall of shocked intergalactic gas. Finally I will discuss the contribution of the DLA plasma to the baryon and metal budgets, in the context of the "Missing Metal Problem" at high redshift.
vendredi 3 novembre 2006 - 11:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
Page web du séminaire / Seminar's webpage