Abundance ratios in quasi-stellar objects

Details Abundance ratios in quasi-stellar objects Abundance ratios in quasi-stellar objects

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..51..249t&link_type=abstract

Astrophysics and Space Science, vol. 51, no. 2, Oct. 1977, p. 249-264.

Astronomy and Astrophysics

Astrophysics

7

Abundance, Chemical Evolution, Quasars, Bandwidth, Emission Spectra, Galactic Nuclei, Red Shift, Standard Deviation, Tables (Data), Ultraviolet Radiation, Wavelengths

Scientific paper

Relative abundances of carbon and aluminum with respect to silicon have been calculated for the QSOs PHL 957, PKS 0237-23, 1331 + 170, 3C 191, and M132. Relative abundances of Fe with respect to Mg have been also calculated for the QSOs 1331 + 170 and PHL 938. The ratios N(C)/N(Si), N(Al)/N(Si), and N(Fe)/N(Mg) in QSOs considered as a class are 5.5 + or - 1.6, 0.13 + or - 0.03, and 2.6 + or - 1.2, respectively. The ratio N(C)/N(Si) shows a mild trend of increase with decreasing emission redshift. This suggests the possibility that the QSOs might be evolving chemically.

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