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2 results

  • Intergalactic medium

  • Raghunathan Srianand
  • Journal:
    Proceedings of the International Astronomical Union / Volume 1 / Issue S232 / November 2005
    Published online by Cambridge University Press:
    17 May 2006, pp. 130-139
    Print publication:
    November 2005
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  • 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.

  • Molecular hydrogen at high redshift

  • R. Srianand
  • Journal:
    Proceedings of the International Astronomical Union / Volume 1 / Issue S232 / November 2005
    Published online by Cambridge University Press:
    17 May 2006, pp. 319-323
    Print publication:
    November 2005
    • Article
      • You have access
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  • Absorption lines of molecular hydrogen provide a most sensitive and powerful tool to understand the early evolution of galaxies and the intergalactic medium (IGM). In addition these lines are useful to investigate the space and time variations of the ratio of electron to proton mass. In this presentation I review the status of the search for H$_2$ at high $z$. High resolution spectrograph on ELTs will allow us to detect H$_2$ in the Lyman Break Galaxies (LBGs) and CO and HD in DLAs that already show H$_2$. This will allow us to investigate the astrochemistry at early epochs and study the physics of interstellar medium (ISM) at high redshifts.