INTERSTELLAR ANALOGS FROM DEFECTIVE CARBON NANOSTRUCTURES ACCOUNT FOR INTERSTELLAR EXTINCTION
INTERSTELLAR ANALOGS FROM DEFECTIVE CARBON NANOSTRUCTURES ACCOUNT FOR INTERSTELLAR EXTINCTION
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DOI：
10.1088/0004-6256/140/5/1456
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
Z. Tan;H. Chihara;C. Koike;H. Abe;K. Kaneko;Kazuyoshi Sato;S. Ohara
中科院分区：
文献类型：
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作者：
Z. Tan;H. Chihara;C. Koike;H. Abe;K. Kaneko;Kazuyoshi Sato;S. Ohara
由于星际尘埃与银河系环境中物质的演化和许多其他天体物理现象密切相关，在过去的十年里，星际尘埃类似物的实验室合成受到了极大的关注。为了模拟碳质星际尘埃在217.5 nm处的紫外线(UV)消光特性，许多报道集中在实验室合成的星际尘埃类似物的紫外线吸收特性上。然而，紫外线星际消光和人造星际尘埃的类似物之间并没有普遍的联系。在这里，我们表明，通过高能碰撞制备的缺陷碳纳米结构在220nm处表现出紫外光吸收特征，我们认为这是217.5 nm处紫外星际消光的原因。一些碳纳米结构的形态与在阿连德陨石中发现的纳米碳相似。缺陷碳纳米结构的吸收特征与紫外线星际消光的相似性表明缺陷碳纳米结构与星际尘埃之间存在着很强的相关性。
Because interstellar dust is closely related to the evolution of matter in the galactic environment and many other astrophysical phenomena, the laboratory synthesis of interstellar dust analogs has received significant attention over the past decade. To simulate the ultraviolet (UV) interstellar extinction feature at 217.5 nm originating from carbonaceous interstellar dust, many reports focused on the UV absorption properties of laboratory-synthesized interstellar dust analogs. However, no general relation has been established between UV interstellar extinction and artificial interstellar dust analogs. Here, we show that defective carbon nanostructures prepared by high-energy collisions exhibit a UV absorption feature at 220 nm which we suggest accounts for the UV interstellar extinction at 217.5 nm. The morphology of some carbon nanostructures is similar to that of nanocarbons discovered in the Allende meteorite. The similarity between the absorption feature of the defective carbon nanostructures and UV interstellar extinction indicates a strong correlation between the defective carbon nanostructures and interstellar dust.