Kavli Affiliate: Kiyoshi W. Masui
| First 5 Authors: CHIME Collaboration, Mandana Amiri, Arnab Chakraborty, Simon Foreman, Mark Halpern
| Summary:
We report the detection of a new HI absorption system associated with the
radio source NVSS J164725+375218 at a redshift of z=2.327, identified through a
blind survey conducted by the Canadian Hydrogen Intensity Mapping Experiment
(CHIME). This marks the fifth detection of an associated system at z > 2. By
analyzing a subset of available data, we conducted a blind survey for HI
absorption systems within the redshift range of 0.78 to 2.55 along 202 lines of
sight in the declination range of 35 to 60 degrees. We detected three HI
absorbers, including two previously known intervening systems and one newly
discovered associated system. By fitting the absorption profile with a number
of Gaussian functions, we put lower limits on the optical depth, velocity
integrated optical depth and the ratio between the HI column density and the
spin temperature of the absorption systems. These results represent a
validation of CHIME’s absorber search strategy, and demonstrate CHIME’s ability
to discover new absorbers even in small subsets of its full dataset.
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