演講資訊

摘要：

Neutral atomic hydrogen (HI) is the primary fuel for star formation, and an important component of galaxies. Understanding the evolution of the cold neutral gas in galaxies is critical in understanding galaxy evolution. Unfortunately, little is known about the HI content of galaxies at even moderate redshifts, z>~0.3, due to the weakness of the HI 21cm line, the main tracer of the atomic component. For large galaxy samples, ``stacking'' of the redshifted HI 21cm emission allows us to achieve a far better HI mass sensitivity for the population than would be possible for individual objects. In this talk, I will describe our recent results from such HI 21cm stacking experiments, using upgraded Giant Metrewave Radio Telescope HI 21cm spectroscopy of the DEEP2 Survey fields to probe the atomic gas mass and gas properties of star-forming galaxies out to z~1.5.

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