Molecules at early epochs. VI - A search for the molecular hydrogen in the Z = 3.391 damped Lyman alpha system toward Q0000-263

Details Molecules at early epochs. VI - A search for the molecular hydrogen in the Z = 3.391 damped Lyman alpha system toward Q0000-263 Molecules at early epochs. VI - A search for the molecular hydrogen in the Z = 3.391 damped Lyman alpha system toward Q0000-263

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262..385l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 2, p. 385-394.

Astronomy and Astrophysics

Astrophysics

40

H Lines, Intergalactic Media, Lyman Alpha Radiation, Molecular Spectra, Quasars, Interstellar Matter, Molecular Clouds, Space Density

Scientific paper

MMT observations at 1 A spectral resolution of the QSO 0000-263 in the Ly-alpha forest between 4050 and 4950 A are reported. A total of 221 absorption lines in the observed window are identified, and evidence for high column-density systems at z(abs) of 3.3905 and 3.0533 are presented. The z = 3.39 system is the highest redshift damped Ly-alpha system known, having N(H) = 2 x 10 exp 21/sq cm. No convincing evidence is found for strong molecular hydrogen absorption in this system. At an adopted excitation temperature of 1000 K and a Doppler width of 25 km/s, an upper limit is set to the fractional H2 abundance of 3 x 10 exp -6, which is lower than a typical Galactic value for high column-density interstellar clouds by a factor of nearly 100,000.

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