Molecular hydrogen in the Z = 2.811 absorbing material toward the quasar PKS 0528-250

Details Molecular hydrogen in the Z = 2.811 absorbing material toward the quasar PKS 0528-250 Molecular hydrogen in the Z = 2.811 absorbing material toward the quasar PKS 0528-250

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..517l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 1, 1985, p. 517-521.

Mathematics

Logic

59

Electromagnetic Absorption, Hydrogen Clouds, Molecular Gases, Quasars, Absorption Spectra, Gas Density, Line Spectra, Red Shift

Scientific paper

Among the previously unidentified absorption features in the spectrum of the quasar PKS 0528-250 obtained by Morton et al. 1980, the authors have found tentative evidence for H2 lines at the same redshift (z = 2.811) as that of the well-known absorption-line system. They have estimated the column density of molecules from the curve of growth derived for this system by Morton et al., N(H2) = (2.9±0.3)×1016cm-2; the fraction of H2 appears to be about 2×10-5. The ortho- to para-H2 ratio corresponds to the excitation temperature of Tex(H2) = 300±150K, though the upper rotational levels J ≥ 3 turn out to be overpopulated. The results obtained seem to provide substantial evidence for the existence of molecular hydrogen at the early cosmological epoch with z ≡ 3.

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