Element abundances at high redshift

Details Element abundances at high redshift Element abundances at high redshift

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343l..37m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 343, Aug. 15, 1989, p. L37-L40. Research supported by the Shirley

Astronomy and Astrophysics

Astrophysics

69

Absorption Spectra, Abundance, Cosmochemistry, Quasars, Red Shift, Astronomical Spectroscopy, Charge Coupled Devices, Heavy Elements, Line Spectra, Nuclear Fusion

Scientific paper

Abundances of Si(+), S(+), Cr(+), Mn(+), Fe(_), and Zn(+) are considered for two absorption-line systems in the spectrum of the QSO PKS 0528 - 250. Zinc and sulfur are underabundant, relative to H, by a factor of 10 compared to their solar and Galactic interstellar abundances. The silicon-, chromium-, iron-, and nickel-to-hydrogen ratios are less than the solar values and comparable to the local interstellar ratios. A straightforward interpretation is that nucleosynthesis in these high-redshift systems has led to only about one-tenth as much heavy production as in the gas clouds around the sun, and that the amount of the observed underabundances attributable to grain depletion is small. The dust-to-gas ratio in these clouds is less than 8 percent of the Galactic value.

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