Highest Redshift Image of Neutral Hydrogen in Emission: A CHILES
  Detection of a Starbursting Galaxy at z=0.376
  Our current understanding of galaxy evolution still has many uncertainties
associated with the details of accretion, processing, and removal of gas across
cosmic time. The next generation of radio telescopes will image the neutral
hydrogen (HI) in galaxies over large volumes at high redshifts, which will
provide key insights into these processes. We are conducting the COSMOS HI
Large Extragalactic Survey (CHILES) with the Karl G. Jansky Very Large Array,
which is the first survey to simultaneously observe HI from z=0 to z~0.5. Here,
we report the highest redshift HI 21-cm detection in emission to date of the
luminous infrared galaxy (LIRG) COSMOS J100054.83+023126.2 at z=0.376 with the
first 178 hours of CHILES data. The total HI mass is
$(2.9\pm1.0)\times10^{10}~M_\odot$, and the spatial distribution is asymmetric
and extends beyond the galaxy. While optically the galaxy looks undisturbed,
the HI distribution suggests an interaction with candidate a candidate
companion. In addition, we present follow-up Large Millimeter Telescope CO
observations that show it is rich in molecular hydrogen, with a range of
possible masses of $(1.8-9.9)\times10^{10}~M_\odot$. This is the first study of
the HI and CO in emission for a single galaxy beyond z~0.2.
