在具有反常微波发射的星际介质区域中萘阳离子的证据
Evidence for the naphthalene cation in a region of the interstellar medium with anomalous microwave emission
摘要：
我们报告了位于英仙座分子云复合体区域的中度变红（A $_V$ =3）早期型恒星Cernis 52的高分辨率光谱，该恒星具有异常微波发射。除了最常见的弥漫星际带（DIBs）的存在下，我们检测到两个新的星际或拱星带重合在0.01%的波长与两个最强的波段的萘阳离子（C $_{10}$ H $_{8}^+$）在气相实验室光谱测量在低温下，并找到边际证据的第三强带。假设这些特征是由萘阳离子引起的，从测量的强度和可用的振子强度，我们发现云中0.008%的碳可能是这种分子的形式。我们预计氢的添加导致氢化萘阳离子是丰富的云，并通过电偶极辐射的异常微波发射作出贡献。最简单的多环芳烃的过渡一致的新的星际功能的识别增加了支持的假设，这种类型的分子都弥漫星际波段和异常微波发射的载体。
英文摘要：
We report high resolution spectroscopy of the moderately reddened (A$_V$=3) early type star Cernis 52 located in a region of the Perseus molecular cloud complex with anomalous microwave emission. In addition to the presence of the most common diffuse interstellar bands (DIBs) we detect two new interstellar or circumstellar bands coincident to within 0.01% in wavelength with the two strongest bands of the naphthalene cation (C$_{10}$H$_{8}^+$) as measured in gas-phase laboratory spectroscopy at low temperatures and find marginal evidence for the third strongest band. Assuming these features are caused by the naphthalene cation, from the measured intensity and available oscillator strengths we find that 0.008 % of the carbon in the cloud could be in the form of this molecule. We expect hydrogen additions to cause hydronaphthalene cations to be abundant in the cloud and to contribute via electric dipole radiation to the anomalous microwave emission. The identification of new interstellar features consistent with transitions of the simplest polycyclic aromatic hydrocarbon adds support to the hypothesis that this type of molecules are the carriers of both diffuse interstellar bands and anomalous microwave emission.
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