Colloquium

CHILES, the COSMOS HI Large Extragalactic Survey

Our understanding of the growth of large scale structure has advanced enormously over the last decade, thanks to an impressive synergy between theoretical and observational efforts. The formation and evolution of galaxies within these structures is less well understood and especially the details of the gas physics during accretion and outflow are still controversial. Hydrogen images can help distinguish between growth by mergers and accretion of gas, and between inflow and outflow. I will show results of HI imaging surveys of galaxies in the local universe in a wide range of environments, from the deepest under densities of voids to the cores of galaxy clusters confirming some of the general trends seen in simulations. Small galaxies in voids still seem to accrete gas, and galaxies in clusters are losing it fast. Until recently these HI imaging surveys could not go beyond z~0.1. This is about to change dramatically when the SKA path finders, MeerKAT, ASKAP and Apertif will start their surveys. The recent upgrade of the Very Large Array has turned this telescope into a pathfinder for the pathfinders. I will present the challenges, pitfalls and very first results of CHILES, the COSMOS HI Large Extragalactic Survey. This is a 1000 hour JVLA HI survey, covering the redshift range from z=0 to z=0.45. The survey covers one pointing in the COSMOS field, imaging a 40x 40 arc minute region.

Followed by wine and cheese in Pupin 1402.

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