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Primordial deuterium abundance at z=2.504 towards Q1009+2956 · Around

2018

Primordial deuterium abundance at z=2.504 towards Q1009+2956

Zavarygin, E. O., Webb, J. K., Riemer-Sørensen, S. et al.

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The z_abs = 2.504 Lyman Limit absorption system (LLS) towards Q1009+2956 has previously been used to estimate the primordial deuterium abundance.

Since the initial measurement by Burles & Tytler, this quasar has been observed extensively with the Keck telescope, providing a substantial increase in signal-to-noise (from 60 to 147 at continuum level of Ly-alpha at z_abs=2.504).
We explore a set of different models for the absorption system and find that the deuterium feature is contaminated by Ly-alpha absorption from a low column density H I cloud.
This significantly limits precision to which one can estimate the D/H ratio in this LLS.

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