Other
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..635r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. 635-643.
Other
18
Absorption Spectra, Calcium, Metallicity, Quasars, Red Shift, Stellar Spectra, Abundance, Galactic Radiation, Hydrogen, Potassium, Stellar Composition
Scientific paper
A spectroscopic search for Ca II H and K absorption in known QSO absorption systems is reported, resulting in the detection of this ion in the QSO PKS 0454-22 at z(abs) = 0.4745. Fe II and Mg II absorption lines in this system have been observed, and it is shown that gaseous Ca II is severely underabundant with respect to both Fe II and Mg II. If the observed fraction of Ca II is typical of QSO absorption systems it would explain why this ion has not been readily seen and why two other observed objects, 1101-264 and the BL Lac PKS 0735 + 178, did not give positive detections. The underabundance of Ca II with respect to Fe II and Mg II is similar to that in interstellar clouds in the Galaxy, suggesting the selective condensation of elements on to grains. Alternatively, the lack of Ca II may be due to ionization equilibrium conditions, i.e., a lower ratio of the electron density to the photoionization rate of Ca(+) in the absorbing region than typically found in disk gas in the Galaxy.
Blades Chris J.
Meyer David M.
Morton Donald C.
Robertson Gordon J.
York Donald G.
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