在z = 2.56的三叶草类星体中发现氟化氢
Discovery of Hydrogen Fluoride in the Cloverleaf Quasar at z = 2.56
摘要：
本文报道了在一个高红移类星体中首次探测到氟化氢。使用加州理工学院亚毫米波天文台（CSO），我们检测到HF J = 1 - 0跃迁的吸收向立体式，宽吸收线（BAL）准恒星物体（QSO）在z=2.56。检测在~ 6 sigma水平具有统计学显著性。我们估计HF柱密度的下限为4 \times × 10 14 cm-2，并使用先前对氢柱密度的估计，我们获得HF丰度的下限为1.7 \times × 10-9。这个值表明，假设银河系的N（HF）/NH比率，在立体式类星体的视线范围内，HF至少占气相中氟的10%。这一观察结果证实了HF应该是高红移分子气体的良好探针的预言。迫切需要测量HF丰度作为红移的函数，以更好地约束氟核合成机制。
英文摘要：
We report the first detection of hydrogen fluoride (HF) toward a high redshift quasar. Using the Caltech Submillimeter Observatory (CSO) we detect the HF J = 1 - 0 transition in absorption toward the Cloverleaf, a broad absorption line (BAL) quasi-stellar object (QSO) at z=2.56. The detection is statistically significant at the ~ 6 sigma level. We estimate a lower limit of 4 \times 1014 cm-2 for the HF column density and using a previous estimate of the hydrogen column density, we obtain a lower limit of 1.7 \times 10-9 for the HF abundance. This value suggests that, assuming a Galactic N(HF)/NH ratio, HF accounts for at least ~10% of the fluorine in the gas phase along the line of sight to the Cloverleaf quasar. This observation corroborates the prediction that HF should be a good probe of the molecular gas at high redshift. Measurements of the HF abundance as a function of redshift are urgently needed to better constrain the fluorine nucleosynthesis mechanism(s).
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