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arXiv 1702.03296astro-ph.GA
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在Milky Way中搜索星际LiH

Search for Interstellar LiH in the Milky Way

David Neufeld, Paul F. Goldsmith, Claudia Comito, Anika Schmiedeke

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16 pages, including 5 figures. Accepted for publication in the Astrophysical Journal
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摘要：

我们报告的结果，灵敏的搜索443.952902 GHz的$J=1-0$过渡的LiH分子向两个星际云在银河系中，W49 N和Sgr B2（主），已进行了使用阿塔卡马探路者实验（APEX）望远镜。在W49 N方向获得的结果将LiH丰度的上限$1.9 \times 10^{-11}\, (3σ)$（$N({\rm LiH})/N({\rm H}_2)$）置于前景中，扩散分子云沿着视线到达W49 N，相当于太阳系锂丰度的0.5%。那些朝向Sgr B2（Main）获得的数据将$N({\rm LiH})/N({\rm H}_2) < 3.6 \times 10^{-13} \,(3σ)$的丰度限制在Sgr B2云本身内的致密气体中。这些限值远小于先前报告的$z=0.685$吸收剂对B0218+357的LiH试探性检测所暗示的限值。

英文摘要：

We report the results of a sensitive search for the 443.952902 GHz $J=1-0$ transition of the LiH molecule toward two interstellar clouds in the Milky Way, W49N and Sgr B2 (Main), that has been carried out using the Atacama Pathfinder Experiment (APEX) telescope. The results obtained toward W49N place an upper limit of $1.9 \times 10^{-11}\, (3σ)$ on the LiH abundance, $N({\rm LiH})/N({\rm H}_2)$, in a foreground, diffuse molecular cloud along the sight-line to W49N, corresponding to 0.5% of the solar system lithium abundance. Those obtained toward Sgr B2 (Main) place an abundance limit $N({\rm LiH})/N({\rm H}_2) < 3.6 \times 10^{-13} \,(3σ)$ in the dense gas within the Sgr B2 cloud itself. These limits are considerably smaller that those implied by the tentative detection of LiH reported previously for the $z=0.685$ absorber toward B0218+357.

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