星际磷化氢在渐近巨分支星IRC+10216中的确认
Confirmation of interstellar phosphine towards asymptotic giant branch star IRC+10216
AI总结：
利用ALMA首次确认探测到AGB星IRC+10216中的磷化氢，通过LTE建模测定其柱密度和丰度，并推测其可能由尘埃表面PH2氢化形成。
摘要：
磷（P）是星系化学演化及多种生化反应的重要元素，也是地球上生命形成的关键化合物之一。在星际介质中，磷化氢（PH$_{3}$）是一种关键的生物分子，对于理解含磷分子（尤其是磷化氮（PN）和一氧化磷（PO））在气相或星际尘埃中的化学过程起着重要作用。我们利用阿塔卡马大型毫米/亚毫米阵列（ALMA）第6频段，首次确认探测到渐近巨分支（AGB）富碳星IRC+10216中的磷化氢（PH$_{3}$）。我们探测到PH$_{3}$的$J$ = 1$_{0}$$-$0$_{0}$转动跃迁线，信噪比（SNR）≥3.5$σ$。这是首次在星际介质（ISM）中确认探测到磷化氢（PH$_{3}$）。基于LTE光谱建模，在激发温度52±5 K下，PH$_{3}$的柱密度为(3.15±0.20)×10$^{15}$ cm$^{-2}$。PH$_{3}$相对于H$_{2}$的丰度为(8.29±1.37)×10$^{-8}$。我们还讨论了PH$_{3}$可能的形成途径，并认为PH$_{3}$可能是通过IRC+10216尘埃表面上的PH$_{2}$氢化作用产生的。
英文摘要：
Phosphorus (P) is an important element for the chemical evolution of galaxies and many kinds of biochemical reactions. Phosphorus is one of the crucial chemical compounds in the formation of life on our planet. In an interstellar medium, phosphine (PH$_{3}$) is a crucial biomolecule that plays a major role in understanding the chemistry of phosphorus-bearing molecules, particularly phosphorus nitride (PN) and phosphorus monoxide (PO), in the gas phase or interstellar grains. We present the first confirmed detection of phosphine (PH$_{3}$) in the asymptotic giant branch (AGB) carbon-rich star IRC+10216 using the Atacama Large Millimeter/Submillimeter Array (ALMA) band 6. We detect the $J$ = 1$_{0}$$-$0$_{0}$ rotational transition line of PH$_{3}$ with a signal-to-noise ratio (SNR) of $\geq$3.5$σ$. This is the first confirmed detection of phosphine (PH$_{3}$) in the ISM. Based on LTE spectral modelling, the column density of PH$_{3}$ is (3.15$\pm$0.20)$\times$10$^{15}$ cm$^{-2}$ at an excitation temperature of 52$\pm$5 K. The fractional abundance of PH$_{3}$ with respect to H$_{2}$ is (8.29$\pm$1.37)$\times$10$^{-8}$. We also discuss the possible formation pathways of PH$_{3}$ and we claim that PH$_{3}$ may be created via the hydrogenation of PH$_{2}$ on the grain surface of IRC+10216.
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