Center for Astrophysics Research and Technologies Seminar Series
Predictions of the statistical robustness of the measurements of the Neutral Hydrogen Mass Function and cosmic HI density
Presented by Monica Sanchez, UNM
Hydrogen is the fuel for star formation, but relatively little is known about the role of cold gas in galaxy evolution. The COSMOS H I Large Extragalactic Survey (CHILES) is an on-going deep H I survey being conducted with the VLA, probing a region within the COSMOS field in the 21cm line of neutral hydrogen. CHILES is the first survey to observe H I in emission from z=0 to z~0.5. This allows us to observe the content, morphology and kinematics of H I in relation to stellar disks, and how it may have evolved over this period. I will present a simulation of the galaxy detections that could be made by the survey, based on multi-wavelength data from the COSMOS dataset in the VLA field of view. These were then used to calculate a Neutral Hydrogen Mass Function (HIMF), which describes the space density of galaxies as a function of their H I mass, and the cosmic HI density. I discuss the statistical robustness of these values we are capable of deriving for the entire survey, and as a function of redshift and environment.
2:00 pm, Thursday, December 1, 2016
PAIS-2540, PAIS
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