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The COSMOS HI Large Extragalactic Survey (CHILES) is survey at radio wavelength being undertaken with the Jansky Very Large Array (JVLA) in New Mexico, U.S.A. The survey aims to detect hydrogen gas in galaxies out into the distant Universes. This gas is important as it is the fuel with which galaxies form new stars. The gas is easily disrupted when galaxies interact with each other and their local environment. Understanding what happens to this gas is essential in our model for how the galaxies we observe today were formed.

Within the CHILES team I provide the optical spectroscopic data required to find the galaxies and provide measurements of their local environment. I am also working on projects to explore how the gas in galaxies is affected when two galaxies collide!

If you would like to know more about CHILES, see here.

Overview for Astronomers

Neutral hydrogen plays a central role in both driving and regulating star formation over cosmic time. We will produce the first HI deep field, to be carried out with the VLA in B array and covering a redshift range from z=0 to z=0.45. The field is centered at the COSMOS field. We will produce HI images of at least 300 galaxies spread over the entire redshift range. With help from the already existing ancillary data we will get integrated profiles of about 500 spectroscopically known galaxies and with the use of stacking we will be able to determine mean HI properties as function of redshift, galaxy mass, color and location in the large scale structure. This will be the first HI imaging that goes well beyond a redshift of z=0.2, doubling the lookback time of HI imaging studies. Ancillary benefits will include deep continuum imaging, HI absorption, and a search for transients.


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