THE COSMOLOGICAL BARYON DENSITY FROM THE DEUTERIUM-TO-HYDROGEN RATIO IN QSO ABSORPTION SYSTEMS: D/H TOWARD Q1243+3047

@article{Kirkman2003THECB,
  title={THE COSMOLOGICAL BARYON DENSITY FROM THE DEUTERIUM-TO-HYDROGEN RATIO IN QSO ABSORPTION SYSTEMS: D/H TOWARD Q1243+3047},
  author={David Kirkman and David Tytler and Nao Suzuki and John M. O’Meara and Dan Lubin},
  journal={Astrophysical Journal Supplement Series},
  year={2003},
  volume={149},
  pages={1-28}
}
We report the detection of deuterium absorption at redshift 2.525659 toward Q1243+3047. We describe improved methods to estimate the deuterium to hydrogen abundance ratio (D/H) in absorption systems, including improved modeling of the continuum level, the Lyα forest, and the velocity structure of the absorption. Together with improved relative flux calibration, these methods give D/H = 2.42 × 10-5 from our Keck I HIRES spectra of Q1243+3047, where the error is from the uncertainty in the shape… Expand
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