Speaker
Description
The weakness of the hyperfine HI 21cm line, the main tracer of the HI content of galaxies, has meant that we know little about the atomic gas content of high-redshift galaxies and its redshift evolution. In this talk, I will describe new HI 21cm studies of star-forming galaxies at z~0.7-1.5 that, via stacking their HI 21cm emission signals, have resulted in the first measurements of the average atomic gas mass of high-z galaxies and the dependence of the atomic gas mass on the stellar mass, the M_HI-M_star scaling relation. I will also describe the use of this scaling relation to determine the gas accretion rate and the total baryonic content of star-forming galaxies at these redshifts, and the evolution of these quantities over the last 9 billion years.
