论文标题
宇宙射线加热的星际尘埃的温度光谱。 iii。混合成分晶粒
Temperature Spectra of Interstellar Dust Grains Heated by Cosmic Rays. III. Mixed Composition Grains
论文作者
论文摘要
星际培养基和星形形成区域中的冰冷晶粒由多种材料组成。与简单的单物质晶粒相比，这种复合晶粒与宇宙射线（CR）颗粒的相互作用不同。我们的目的是计算CRS全谷物加热的混合组分晶粒的能量和温度的光谱。假定谷物由碳和橄榄石的混合物组成，这些碳和橄榄石由碳氧化物和水组成。半径0.05的晶粒的能量和温度光谱；计算了0.1和0.2微米受CRS影响的微米，以八个柱密度值，与分子云和恒星形成核有关。该方法考虑了冰厚度和成分的变化，并随着柱密度的增加。这些与星际晶粒相互作用的详细数据旨在用于在天体化学模型中的应用。主要发现是，对谷物热容量和其他因素的更准确方法可阻止0.1微米或更大的冰晶粒加热到高温。
Icy grains in the interstellar medium and star-formation regions consist of a variety of materials. Such composite grains interact differently with cosmic-ray (CR) particles compared to simple single-material grains. We aim to calculate the spectra of energies and temperatures of mixed-composition grains undergoing whole-grain heating by CRs. The grains were assumed to consist of a mixture of carbon and olivine, covered by ices consisting of carbon oxides and water. The energy and temperature spectra for grains with radii 0.05; 0.1, and 0.2 microns impacted by CRs were calculated for eight values of column density, relevant to molecular clouds and star-forming cores. The approach takes into account changes in ice thickness and composition with increasing column density. These detailed data for CR interaction with interstellar grains are intended for applications in astrochemical models. The main finding is that the a more accurate approach on grain heat capacity and other factors prevent a frequent heating of 0.1 micron or larger icy grains to high temperatures.
