Abstract
We present new measurements of HD/H2 in absorption systems at redshift z ∼ 2 in quasar spectrum J 0812+3208 and J 2340−0053. In J 0812+3208 we detect and measure column density of H2 at z ∼ 2.07 for the first time and place upper limit on HD column density. In J 2340−0043 we identify HD in already known multicomponent H2 absorption system at z ∼ 2.05. In this system we obtain relative abundance of HD/H2 molecules close to isotopic ratio, suggesting the similar molecular fraction of deuterium and hydrogen. We discuss possible explanation of measured HD/H2 abundance.
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