Connecting the Baryons: Multiwavelength Data for SKA HI Surveys

Understand

The science achievable with SKA HI surveys will be greatly increased through the combination of HI data with that at other wavelengths.

• These multiwavelength datasets will enable studies to move beyond an understanding of HI gas in isolation to instead understand HI as an integral part of the highly complex baryonic processes that drive galaxy evolution.
• As they evolve, galaxies experience a host of environmental and feedback influences, many of which can radically impact their gas content.
• Important processes include: accretion (hot and cold mode, mergers), depletion (star formation, galactic winds, AGN), phase changes (ionised/atomic/molecular), and environmental effects (ram pressure stripping, tidal effects, strangulation).