AGN和星暴中的水冰

A. Yeghikyan, A. Samsonyan
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引用次数: 0

摘要

复杂的化学物质更容易在固相中形成,例如在水的冰、碳氧化物、甲烷、氨、甲醇和其他较少的分子的混合物中形成。5 - 13.6 eV范围内的紫外光子和MeV-GeV能量的带电粒子作为反应的能量来源。含有上述物质的冰粒子只能存在于不受外部紫外线辐射影响的星际分子云的内部区域。然而,宇宙射线能够穿透云层,并通过引发络合化学反应所必需的二次紫外线光子对冰进行照射。本文讨论了冰在活动星系恶劣条件下的生存能力。初步的模型计算表明,冰的丰度不仅取决于云的电离参数,而且还取决于入射辐射的形状,即硬紫外线和x射线辐射的存在和水平。最后一种情况与活动核星系吸积盘的辐射直接相关,可以用来对活动星系进行分类,例如区分星爆星系和活动核星系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Water Ice in AGN and Starbursts
Complex chemical species are easier formed in a solid phase, for example in a mixture of ices of water, carbon oxides, methane, ammonia, methanole and other, less abundant molecules. Ultraviolet photons in the range 5 - 13.6 eV and the charged particles with MeV-GeV energies serve as an energy source of reactions. Icy particles containing mentioned substances, can exist only in internal areas of the interstellar molecular clouds protected from influence of external ultraviolet radiation. However cosmic rays are capable to penetrate in clouds and to cause an irradiation of ices by means of secondary ultra-violet photons necessary for initiation of chemical reactions of complexisation. In this work a survivability of ices under harsh conditions of active galaxies is discussed. Preliminary model calculations show that abundances of ices depend not only on ionization parameters of the clouds but also on the shape of incident radiation that is on presence and level of hard ultraviolet and X-ray radiation. The last circumstance is directly related to the radiation of the accretion disk of galaxies with active nuclei and can be used to classify active galaxies, for example to distinguish starburst galaxies from those with active nuclei.
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