1. Studying hot gas using the ultraviolet: High ions in galactic halos.
- Author
-
Fox, Andrew J., Petitjean, Patrick, Ledoux, Cédric, and Srianand, Raghunathan
- Subjects
- *
GALACTIC halos , *PLASMA gases , *RESONANCE , *SPECTRUM analysis instruments , *SPECTROGRAPHS , *ABSORPTION - Abstract
Among the many spectral lines falling in the ultraviolet are the resonance doublets of the highly ionized species O VI, N V, C IV, and Si IV. By using both space-based UV observations and ground-based optical observations, these lines can be used to trace diffuse astrophysical plasma over a large fraction of the age of the Universe. In this paper we discuss observations of these absorption lines in damped Lyman- α systems at z≈2–3, using the UVES spectrograph on the VLT in Chile. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF