Abstract—A review of molecular hydrogen H2 absorption systems identified in quasar spectra is presented. The analysis of such systems allows the determination of the chemical composition of the interstellar medium and the physical conditions existing in the early Universe, about 10–12 billioin years ago. To date, 27 molecular hydrogen systems have been found, nine of which show HD lines. An independent method for estimating the baryon density of the Universe is described, and is based on the analysis of the relative abundances of H2 and HD molecules. Among known H2/HD systems, only the two systems detected in Q1232+082 and Q0812+320 quasar spectra satisfy the condition of self-shielding of the absorbing cloud logNH2,HD 15. Under these cond...
We present a new measurement of the deuterium-to-hydrogen ratio (D/H) in the Lyman limit absorption ...
International audienceWe present results from a search for strong H 2 absorption systems proximate t...
A precise determination of the light-element abundances produced during the epoch of Big Bang Nucleo...
International audienceWe present a systematic study of deuterated molecular hydrogen (HD) at high re...
International audienceWe present a detailed analysis of the H2 and HD absorption lines detected in t...
We show in this paper why molecular millimeter absorption line searches in DLAs have been unsuccessf...
Context. Absorption lines of H 2 and HD molecules observed at high redshift in the line of sight tow...
The amount of deuterium relative to hydrogen (D/H) in clouds with close to primordial abundance seen...
International audienceContext. Absorption lines of H2 and HD molecules observed at high redshift in ...
In this thesis we make a new measurement of the primordial deuterium abundance, and analyse five oth...
n order to interpret H2 quasar absorption-line observations of damped Lyα systems (DLAs) and subDLAs...
International audienceWe present the detection of deuterated molecular hydrogen (HD) in the remote U...
International audienceContext. Molecular hydrogen in the interstellar medium (ISM) of high-redshift ...
An overview is presented of the H2 quasar absorption method to search for a possible variation of th...
International audienceWe present the detection and detailed analysis of a diffuse molecular cloud at...
We present a new measurement of the deuterium-to-hydrogen ratio (D/H) in the Lyman limit absorption ...
International audienceWe present results from a search for strong H 2 absorption systems proximate t...
A precise determination of the light-element abundances produced during the epoch of Big Bang Nucleo...
International audienceWe present a systematic study of deuterated molecular hydrogen (HD) at high re...
International audienceWe present a detailed analysis of the H2 and HD absorption lines detected in t...
We show in this paper why molecular millimeter absorption line searches in DLAs have been unsuccessf...
Context. Absorption lines of H 2 and HD molecules observed at high redshift in the line of sight tow...
The amount of deuterium relative to hydrogen (D/H) in clouds with close to primordial abundance seen...
International audienceContext. Absorption lines of H2 and HD molecules observed at high redshift in ...
In this thesis we make a new measurement of the primordial deuterium abundance, and analyse five oth...
n order to interpret H2 quasar absorption-line observations of damped Lyα systems (DLAs) and subDLAs...
International audienceWe present the detection of deuterated molecular hydrogen (HD) in the remote U...
International audienceContext. Molecular hydrogen in the interstellar medium (ISM) of high-redshift ...
An overview is presented of the H2 quasar absorption method to search for a possible variation of th...
International audienceWe present the detection and detailed analysis of a diffuse molecular cloud at...
We present a new measurement of the deuterium-to-hydrogen ratio (D/H) in the Lyman limit absorption ...
International audienceWe present results from a search for strong H 2 absorption systems proximate t...
A precise determination of the light-element abundances produced during the epoch of Big Bang Nucleo...