A survey of CH2DOH towards starless and pre-stellar cores in the Taurus molecular cloud

A survey of CH2DOH towards starless and pre-stellar cores in the Taurus molecular cloud
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对金牛座分子云中无星和前恒星核心的 CH2DOH 调查

DOI:
10.1093/mnras/staa3649
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发表时间:
2020
影响因子:
4.8
通讯作者:
Scibelli, Samantha
Scibelli, Samantha
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ambrose, Hannah E;Shirley, Yancy L;Scibelli, Samantha

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最近的观测表明,有机分子普遍朝向无星和星前核心。在无星阶段,这些分子的氘化还没有得到很好的研究。已发表的单氘代甲醇(CH 2DOH)的观测结果仅在几个经过充分研究的致密和演化的前恒星核心(例如L1544,L183)中观察到。由于形成的气相甲醇在此冷相被认为是通过从冰冷的颗粒表面解吸发生的,CH 2DOH的观测可能是有用的,作为一个探针的氘馏分在尘埃颗粒的冰地幔。我们提出了一个系统的调查CH 2DOH对12无星和恒星前的核心在B10地区的金牛座分子云。12个岩心中有9个岩心的[CH_2DOH]/[CH_3OH]范围为<0.04 - 0.23,中值为0.11。未检测到的源往往比检测到的源具有更大的维里参数和更大的甲醇线宽。这项调查的结果表明,氘分馏的有机分子,如甲醇,在无星阶段可能比以前认为的更容易检测。
Recent observations indicate that organic molecules are prevalent towards starless and pre-stellar cores. Deuteration of these molecules has not been well studied during the starless phase. Published observations of singly deuterated methanol, CH2DOH, have only been observed in a couple of well-studied, dense, and evolved pre-stellar cores (e.g. L1544, L183). Since the formation of gas-phase methanol during this cold phase is believed to occur via desorption from the icy grain surfaces, observations of CH2DOH may be useful as a probe of the deuterium fraction in the ice mantles of dust grains. We present a systematic survey of CH2DOH towards 12 starless and pre-stellar cores in the B10 region of the Taurus molecular cloud. Nine of the 12 cores are detected with [CH2DOH]/[CH3OH] ranging from <0.04 to 0.23with a median value of 0.11. Sources not detected tend to have larger virial parameters and larger methanol linewidths than detected sources. The results of this survey indicate that deuterium fractionation of organic molecules, such as methanol, during the starless phase may be more easily detectable than previously thought.
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