On the abundances in the Z = 2.81 absorbing material toward the quasi-stellar object PKS 0528-250

Details On the abundances in the Z = 2.81 absorbing material toward the quasi-stellar object PKS 0528-250 On the abundances in the Z = 2.81 absorbing material toward the quasi-stellar object PKS 0528-250

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..369s&link_type=abstract

Astrophysical Journal, Part 1, vol. 228, Mar. 1, 1979, p. 369-374.

Astronomy and Astrophysics

Astrophysics

55

Absorption Spectra, Abundance, Emission Spectra, Quasars, Atmospheric Diffusion, Cosmic Dust, High Resolution, Line Spectra, Mass Ratios, Red Shift

Scientific paper

Results are reported for measurements of line strengths in the z = 2.81 absorption-line system toward the quasar PKS 0528-250. It is found that the L-alpha line probably lies on the damping portion of the curve of growth and that the Al III doublet lines near 1860 A apparently lie on or near the linear portion of the curve of growth. Logarithmic gas-phase abundance ratios (relative to H I) of approximately -7.4 for Al III, -5.9 for S II, and -5.4 for Si II are derived; both sulfur and silicon are shown to be significantly underabundant in comparison with the solar values. It is suggested that the material along the line of sight to PKS 0528-250 is likely to be distributed in several clouds with individual velocity dispersions considerably less than 100 km/s, that the derived abundances probably reflect the total gas-phase abundances of the relevant elements, and that either there is an unusually small dust-to-gas ratio in the absorbing gas or the dust present has different absorption and scattering properties than dust in the Galaxy. The detection of very broad emission lines with a redshift of approximately 2.76 is also discussed.

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