高红移的HD分子：z=2.418时太阳金属丰度DLA系统中氘的低吸收因子
HD molecules at high redshift: A low astration factor of deuterium in a solar-metallicity DLA system at z=2.418
摘要：
我们在zabs=2.418的阻尼莱曼α云中探测到了遥远宇宙中的氘分子氢（HD），该云朝向类星体SDSS J143912.04+111740.5。这是一个独特的系统，其中H2和CO分子也被检测到。这种来自ZnII和SII的气体的化学富集度与太阳一样高。我们测得N（HD）/2 N（H2）=1.5+0.6-0.4 x 10^-5，这比在银河系中测得的相同比值要高得多，而且接近于根据WMAP对重子物质密度Omega_b的约束估计的原始D/H比值。这表明氘的吸收系数低，与气体的异常高的化学富集形成对比。这可以被解释为原始气体强烈流入相关星系的结果。HD分子在高Z的检测也打开了获得一个独立的约束的宇宙时间变异性的μ，质子-电子质量比的可能性。
英文摘要：
We present the detection of deuterated molecular hydrogen (HD) in the remote Universe in a damped Lyman-alpha cloud at zabs=2.418 toward the quasar SDSS J143912.04+111740.5. This is a unique system in which H2 and CO molecules are also detected. The chemical enrichment of this gas derived from ZnII and SII is as high as in the Sun. We measure N(HD)/2 N(H2)=1.5+0.6-0.4 x 10^-5, which is significantly higher than the same ratio measured in the Galaxy and close to the primordial D/H ratio estimated from the WMAP constraint on the baryonic matter density Omega_b. This indicates a low astration factor of deuterium that contrasts with the unusually high chemical enrichment of the gas. This can be interpreted as the consequence of an intense infall of primordial gas onto the associated galaxy. Detection of HD molecules at high-z also opens the possibility to obtain an independent constraint on the cosmological-time variability of mu, the proton-to-electron mass ratio.
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