The primordial deuterium abundance at z = 2.504 from a high signal-to-noise spectrum of Q1009+2956

E. O. Zavarygin, J. K. Webb, V. Dumont +1

The spectrum of the $z_{\mathrm{em}}=2.63$ quasar Q1009+2956 has been observed extensively on the Keck telescope. The Lyman limit absorption system $z_{\mathrm{abs}}=2.504$ was previousl…