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Discovery of Interstellar Isocyanogen (CNCN): Further Evidence that Dicyanopolyynes are Abundant in Space

机译:星际异氰酸根(CNCN)的发现:进一步的证据表明双氰基多炔在太空中含量很高

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摘要

It is thought that dicyanopolyynes could be potentially abundant interstellar molecules, although their lack of dipole moment makes it impossible to detect them through radioastronomical techniques. Recently, the simplest member of this chemical family, cyanogen (NCCN), was indirectly probed for the first time in interstellar space through the detection of its protonated form toward the dense clouds L483 and TMC-1. Here we present a second firm evidence of the presence of NCCN in interstellar space, namely the detection of the metastable and polar isomer isocyanogen (CNCN). This species has been identified in L483 and tentatively in TMC-1 by observing various rotational transitions in the λ 3 mm band with the IRAM 30m telescope. We derive beam-averaged column densities for CNCN of 1.6 × 1012 cm−2 in L483 and 9 × 1011 cm−2 in TMC-1, which imply fractional abundances relative to H2 in the range (5 – 9) × 10−11. While the presence of NCCN in interstellar clouds seems out of doubt owing to the detection of NCCNH+ and CNCN, putting tight constraints on its abundance is still hampered by the poor knowledge of the chemistry that links NCCN with NCCNH+ and especially with CNCN. We estimate that NCCN could be fairly abundant, in the range 10−9-10−7 relative to H2, as other abundant nitriles like HCN and HC3N.
机译:人们认为,双氰基聚炔可能是潜在的丰富的星际分子,尽管它们缺乏偶极矩,因此无法通过放射天文技术对其进行检测。最近,通过检测朝向稠密云L483和TMC-1的质子化形式,首次在星际空间中间接探测了该化学家族中最简单的成员氰(NCCN)。在这里,我们提供星际空间中NCCN的存在的第二个确凿证据,即检测亚稳态和极性异构体异氰酸酯(CNCN)。通过使用IRAM 30m望远镜观察λ3 mm波段的各种旋转跃迁,已在L483和TMC-1中初步确定了该物种。我们得出L483中1.6×10 12 cm −2 的CNCN的波束平均列密度和9×10 11 cm − TMC-1中的2 表示相对于H2的分数丰度在(5 – 9)×10 −11 范围内。尽管由于检测到NCCNH + 和CNCN,星际云中NCCN的存在似乎是毋庸置疑的,但对NCCN与NCCNH之间联系的化学知识的了解仍然限制了其丰度的严格限制。 + ,尤其是对于CNCN。我们估计NCCN相对于H2可能相当丰富,在10 −9 -10 −7 范围内,就像其他丰富的腈类(如HCN和HC3N)一样。

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