Molecular Hydrogen in high redshift Damped Lyman-α systems

Details Molecular Hydrogen in high redshift Damped Lyman-α systems Molecular Hydrogen in high redshift Damped Lyman-α systems

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ap%26ss.281..467p&link_type=abstract

Astrophysics and Space Science, v. 281, Issue 1, p. 467-470 (2002).

Astronomy and Astrophysics

Astrophysics

Observational Cosmology, Quasars, Absorption Lines, Molecular Hydrogen

Scientific paper

I describe briefly the status of an ongoing mini-survey for molecular hydrogen in high-redshift Damped Lyman-α systems using UVES at the VLT. H2 is detected in about 30% of the cases. When H2 is not detected the molecular fraction f = 2N(H2)/(2N(H2)+N(HI) is smaller than 10-5. Therefore, most of the DLA systems arise in warm (T > 3000 K) and diffuse neutral gas embedded in a strong UV flux. The very recent detection of HD molecules in a Damped Lyman-α system at z abs = 2.337 demonstrates the possibility to discuss the high redshift chemistry.

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