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arXiv 1502.00388astro-ph.GA
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ISM中灰尘的冷凝结

Cold condensation of dust in the ISM

Gaël Rouillé, Cornelia Jäger, Serge A. Krasnokutski, Melinda Krebsz, Thomas Henning

摘要:

实验研究了辉石和橄榄石组成的复杂硅酸盐在分子云中的凝结。为此目的,包括耐火元素的分子物种被迫在代表星际介质中幸存尘埃颗粒的冷表面的冷基底上增生。在约12 K的温度下,无定形和均匀的镁铁硅酸盐的有效形成已被监测的红外光谱。在星际介质中,这种凝聚过程的气态前体是由超新星激波中的尘埃颗粒侵蚀形成的。在实验室中,我们蒸发玻璃状硅酸盐尘埃类似物,并将释放的物质嵌入氖冰基质中,这些基质已被光谱学研究,以确定冷凝固体硅酸盐的分子前体。可以注意到星际硅酸盐的10微米带和低温硅质冷凝物的10微米带之间的声音重合。

英文摘要:

The condensation of complex silicates with pyroxene and olivine composition at conditions prevailing in molecular clouds has been experimentally studied. For this purpose, molecular species comprising refractory elements were forced to accrete on cold substrates representing the cold surfaces of surviving dust grains in the interstellar medium. The efficient formation of amorphous and homogeneous magnesium iron silicates at temperatures of about 12 K has been monitored by IR spectroscopy. The gaseous precursors of such condensation processes in the interstellar medium are formed by erosion of dust grains in supernova shock waves. In the laboratory, we have evaporated glassy silicate dust analogs and embedded the released species in neon ice matrices that have been studied spectroscopically to identify the molecular precursors of the condensing solid silicates. A sound coincidence between the 10 micron band of the interstellar silicates and the 10 micron band of the low-temperature siliceous condensates can be noted.

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