DISCOVERY OF SiCSi IN IRC+10216: A MISSING LINK BETWEEN GAS AND DUST CARRIERS OF Si-C BONDS
DISCOVERY OF SiCSi IN IRC+10216: A MISSING LINK BETWEEN GAS AND DUST CARRIERS OF Si-C BONDS
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DOI：
10.1088/2041-8205/806/1/l3
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发表时间：
2015-06-10
影响因子：
7.9
通讯作者：
Young, K. H.
中科院分区：
文献类型：
--
作者：
Cernicharo, J.;McCarthy, M. C.;Young, K. H.
我们报道了用IRAM 30米射电望远镜在80到350 GHz之间的观测中在太空中发现了一种名为SiCSi的硅硅物种。由于实验室实验和天体物理学的密切配合，目前已在富碳恒星CW LEO中探测到112条谱线。得到的频率产生了高达六阶的旋转和离心形变常数。根据亚毫米阵列的谱线分布和干涉图，大部分SiCSi发射来自半径为6。的区域。得出的丰度与SiC2相当。正如化学平衡计算所预期的那样，SiCSi和SiC2是粉尘形成区中含有Si-C键的最丰富的物种，当然两者都在碳化硅粉尘颗粒的形成中起着关键作用。
We report the discovery in space of a disilicon species, SiCSi, from observations between 80 and 350 GHz with the IRAM 30 m radio telescope. Owing to the close coordination between laboratory experiments and astrophysics, 112 lines have now been detected in the carbon-rich star CW Leo. The derived frequencies yield improved rotational and centrifugal distortion constants up to sixth order. From the line profiles and interferometric maps with the Submillimeter Array, the bulk of the SiCSi emission arises from a region of 6. in radius. The derived abundance is comparable to that of SiC2. As expected from chemical equilibrium calculations, SiCSi and SiC2 are the most abundant species harboring a Si-C bond in the dust formation zone and certainly both play a key role in the formation of SiC dust grains.