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Abundance ratios in quasi-stellar objects

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Abstract

Relative abundances of carbon and aluminium with respect to silicon have been calculated in the QSOs PHL957, PKS0237-23, 1331+170, 3C191 and M132. Relative abundance of Fe with respect to Mg has been also calculated in the QSOs 1331+170 and PHL938. The ratiosN(C)/N(Si),N(Al)/N(Si) andN(Fe)/N(Mg) in QSOs considered as a class are (5.5±1.6), (0.13±0.03) and (2.6±1.2), respectively.

The ratioN(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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Authors and Affiliations

  1. Dept. of Physics, Ravishankar University, Raipur, India

    R. K. Thakur & P. K. Mishra

  2. Dept. of Physics, College of Science, Raipur, India

    P. K. Mishra

Authors
  1. R. K. Thakur
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  2. P. K. Mishra
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Thakur, R.K., Mishra, P.K. Abundance ratios in quasi-stellar objects. Astrophys Space Sci 51, 249–264 (1977). https://doi.org/10.1007/BF00644151

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