Contatto di riferimento: Cristian Vignali
Partecipanti: Gargely Popping (ESO, Garching)
Abstract
The star-formation activity of our Universe increased from early epochs (z~6), peaked around z=2, and then decreased by an order of magnitude until present age. To fully appreciate the physical origin of the star-formation activity of our Universe we need to focus on the gas content of galaxies over cosmic time. The most recent versions of cosmological models of galaxy formation explicitly include the detailed tracking of the atomic and molecular hydrogen content of galaxies and make predictions for the sub-mm lines emission from species such as CO, HCN, and [CII]. New semi-empirical approaches provide data-driven predictions for the atomic and molecular gas content of galaxies. I will discuss the predictions made by these different types of models for the HI and H2 content of galaxies and their sub-mm line emission, and the inferred gas properties of 25000 galaxies at redshfits 0.5 < z < 3, taken from the CANDELS survey. I will present results such as a weak evolution in the HI content and HI mass function of galaxies, strong evolution in the H2 content of galaxies, weak evolution in the cosmic density of HI, the evolution of atomic and molecular gas in dark matter haloes, and predictions for CO luminosity functions. I will finish by demonstrating how a comparison between theoretical models of galaxy formation and observed and inferred gas masses can reveal caveats in our understanding of galaxy physics.
Next seminars:
* Thursday June 16th, at 14:00
NO SEMINAR
* Thursday June 23rd, at 14:00
Monica Tosi (INAF, OABo)
* Tuesday July 26th, at 14:00
Fabio Vito (Penn State Univ., US)