The absorption lines seen in the spectra of high redshift QSOs are important tools for studying the early evolution of galaxies and intergalactic medium. In this presentation I briefly review various available observations, our understanding of different types of absorption systems, and highlight some of the issues that can be addressed with ELTs. © 2006 International Astronomical Union.
CITATION STYLE
Srianand, R. (2005). Intergalactic medium. Proceedings of the International Astronomical Union, 1(S232), 130–139. https://doi.org/10.1017/S1743921306000378
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