Molecular absorptions in high-z objects

Conference paper

Abstract

Molecular absorption lines measured along the line of sight of distant quasars are important probes of the gas evolution in galaxies as a function of redshift. A review is made of the handful of molecular absorbing systems studied so far, with the present sensitivity of mm instruments. They produce information on the chemistry of the ISM at z∼1, the physical state of the gas, in terms of clumpiness, density and temperature. The CMB temperature can be derived as a function of z, and also any possible variations of fundamental constants can be constrained. With the sensitivity of ALMA, many more absorbing systems can be studied, for which some predictions and perspectives are described.

Keywords

Galaxies: interstellar medium Quasars: absorption lines Galaxies: evolution Galaxies: high-redshift 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.LERMAObservatoire de ParisParisFrance

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