The hydrocarbon ring C3H2 is ubiquitous in the Galaxy.
The hydrocarbon ring C3H2 is ubiquitous in the Galaxy.
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DOI：
10.1086/184567
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发表时间：
1985-11
期刊：
影响因子：
--
通讯作者：
He Matthews;William M. Irvine
中科院分区：
文献类型：
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作者：
He Matthews;William M. Irvine
我们报告了一条强微波(波长1.6厘米)谱线的发现，它的载流子在整个银河系中很常见和广泛。对大量来源的调查表明，这条线出现在冷尘埃云中的发射中，在银河系中心的方向上出现在吸收中，并呈现出复杂的H II区轮廓。对于CaS A和遥远的H II区域，中间的“旋臂”云产生吸收。对于几乎所有的情况，吸收特征显示出惊人的1：1的径向速度与那些所看到的，例如，在相同物体的H_2CO光谱中。数据表明，这条线出现在相当极性的分子的低激发态之间。Thaddeus，Vrtilek和Gottlieb最近的工作，结合目前的数据，于1985年报告，表明所讨论的线是小碳氢环C3H2的1(10)-1(01)转变。
We report the discovery of a strong microwave (lambda 1.6 cm) spectral line, the carrier of which is common and widespread throughout the Galaxy. A survey of a large number of sources shows that the line appears in emission in cold dust clouds, in absorption in the direction of the Galactic center, and exhibits complex profiles toward H II regions. Toward Cas A and distant H II regions, intervening "spiral arm" clouds produce absorption. For almost all cases, the absorption features show a striking 1 : 1 radial velocity correspondence with those seen, e.g., in H2CO spectra of the same objects. The data indicate that the line arises between low-lying energy states of rather polar molecule. Recent work by Thaddeus, Vrtilek, and Gottlieb, reported in 1985 incorporating the present data, shows that the line in question is the 1(10)-1(01) transition of the small hydrocarbon ring C3H2.