论文标题
星际尘埃及其组成的银河系清单的起源和演变
Origin and evolution of the Galactic inventories of interstellar dust and its composition
论文作者
论文摘要
星际灰尘是星系中物质的重要组成部分。尘埃拥有其起源，并在各种天体物理环境中重新处理。为了了解不同类型的星际粉尘颗粒的起源和演变，我们尝试了对不同恒星环境中粉尘晶粒的热力学凝结的全面相关研究，其中带有银河系银河系的银河化学演化。星系是根据几代恒星的恒星核合成贡献产生的元素进化而进化的。基于不断发展的星系的元素组成，评估了星际灰尘的主要成分的相对丰度。主要目的是在银河发展过程中重新分配任何时代的各种可冷凝元素，并根据大量平衡形式理解它们的丰度进化。我们还进行了热力学平衡凝结计算，以了解各种晶粒成分的恒星起源，这些成分可以携带各种恒星核合成源的同位素特征。这也许是一种新颖的尝试，以估算不断发展的银河系中的大块尘埃量预算。预计随着距银河中心的距离的增加，银河尘的归一化质量将减小。随着时间的流逝，它会增加。超新星SN IA被预测为最突出的毒质量来源，Supernovae SN II+Ib/c会产生氧化物和硅酸盐灰尘质量，而AGB恒星有助于碳质量灰尘质量。
Interstellar dust is a significant component of matter in the galaxies. The dust owns its origin and reprocessing in a wide range of astrophysical environments. In order to understand the origin and evolution of the distinct types of interstellar dust grains, we have attempted a comprehensive correlated study of the thermodynamics condensation of dust grains in distinct stellar environments with the Galactic chemical evolution of the Milky Way Galaxy. The Galaxy is evolved in terms of elemental evolution resulting from stellar nucleosynthetic contributions of several generations of stars. Based on the elemental composition of the evolving Galaxy, the relative abundances of the major constituents of interstellar dust are assessed. The major aim is to redistribute the various condensable elements at any epoch during the evolution of the Galaxy into various grain constituents and understand their abundance evolution based on a mass-balance formalism. We also performed thermodynamical equilibrium condensation calculations to understand the stellar origin of various grain constituents that could carry the isotopic signatures of the various stellar nucleosynthetic sources. This is perhaps a novel attempt to estimate the bulk dust mass budget in the evolving Galaxy. The normalized mass of the Galactic dust is predicted to decrease with the increase in distance from the Galactic centre. It increases over time. The supernovae SN Ia are predicted as the most prominent sources of Fe-dust mass, the supernovae SN II+Ib/c produces oxides and silicate dust mass, and the AGB stars contributes to carbonaceous dust mass.
