Atomic and molecular data for interstellar studies: A status report

被引:4
作者
Federman, SR [1 ]
Cardelli, JA [1 ]
机构
[1] VILLANOVA UNIV,DEPT ASTRON & ASTROPHYS,VILLANOVA,PA 19085
来源
PHYSICA SCRIPTA | 1996年 / T65卷
关键词
D O I
10.1088/0031-8949/1996/T65/022
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Most interstellar species have a large fraction of their electronic transitions at far ultraviolet wavelengths. Observations at these wavelengths reveal spectra rich in absorption lines seen against the continuum of a background source, such as a hot star in our Galaxy, a supernova in a nearby galaxy, or even a bright nucleus in an active galaxy. Most of the observations continue to be made with space-borne instruments, but recent work includes measurements of extragalactic material at large redshifts obtained at high resolution with large ground-based telescopes (e.g., the Keck Telescope). The combination of precise experimental oscillator strengths, large-scale computations, and astronomical spectra with high signal-to-noise ratios are yielding a set of self-consistent f-values that span a range in strength in excess of 100 for more and more species. The large range is important for studies involving the different environments probed by the various background sources. This review highlights recent work on the atomic Species. SiII, SI, and FeII, and on the molecules, CO and C-2.
引用
收藏
页码:158 / 162
页数:5
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