Chemical Evolution in Galaxies
Chemical Evolution in Galaxies
复制标题
星系中的化学演化
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
G. Boeshaar
中科院分区：
文献类型：
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作者：
G. Boeshaar
化学丰度为星系演化提供了重要线索。电离星云是化学丰度测量的主要来源之一，特别是在外部星系中。对H II区域的研究表明，星系的整体金属丰度随着星系光度的增加而增加，并且螺旋星系的化学成分具有径向梯度。有迹象表明环境对化学丰度有影响。行星状星云提供了另一种衡量银河系和其他星系丰度的方法。太空设施已经允许测量在光波长下无法到达的元素。大型望远镜使得研究外部星系中的单个恒星以及研究中红移和高红移星系中的星际丰度成为可能。随着天体物理学家努力描绘从大爆炸到现在的银河演化的完整图景，这些进步预示着令人兴奋的时代。
Chemical abundances provide important clues to the evolution of galaxies. Ionized nebulae are one of the main sources of chemical abundance measurements, especially in external galaxies. Studies of H II regions have shown that the overall metallicity of galaxies increases with galactic luminosity, and that spiral galaxies characteristically have radial gradients in chemical composition. There are indications of environmental influences on chemical abundances. Planetary nebulae provide another measure of abundances in the Milky Way and other galaxies. Space facilities have allowed measurements for elements that are inaccessible at optical wavelengths. Large telescopes make possible the study of individual stars in external galaxies and the study of interstellar abundances in galaxies at intermediate and high redshifts. These advances promise exciting times as astrophysicists strive to paint a complete picture of galactic evolution from the Big Bang to the present.