Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-26T03:33:08.857Z Has data issue: false hasContentIssue false
  • English
  • Français

The Environments of Optically-Selected QSOs

Published online by Cambridge University Press:  03 August 2017

B. J. Boyle ,
T. Shanks  and
H. Yee
B. J. Boyle
Affiliation:
Department of Astronomy, University of Edinburgh, U.K.
T. Shanks
Affiliation:
Department of Physics, University of Durham, U.K.
H. Yee
Affiliation:
Department of Physics, University of Montreal, Canada

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In recent years much attention has been focussed on the environments of low redshift QSOs. In particular, Yee and Green (1987) have found that the average environment of radio-loud QSOs at z ≃ 0.6, as measured by the QSO-galaxy spatial covarience function, is over three times richer than that of radio-loud QSOs at z ≃ 0.4. This strongly indicates that there has been a steep evolution in the numbers of QSOs in rich clusters over a period of 109 years. This observation is therefore inconsistent with pure luminosity evolution models, which preserves QSO number with epoch, currently employed by a number of authors (see e.g. Boyle et al. 1987) to explain the observed redshift dependence of the QSO luminosity function. However, since over 90% of QSOs are radio-quiet, the main test concerning the validity of pure luminosity evolution is to look for similar evolutionary effects in the preferred environments of optically-selected QSOs.

Type
Appendix 1: Poster Papers
Information
Symposium - International Astronomical Union , Volume 130: Large Scale Structures of the Universe , 1988 , pp. 576
Copyright
Copyright © Reidel 1988 

References

Boyle, B.J., Fong, R., Shanks, T. and Peterson, B.A. 1987, MNRAS, in the press.Google Scholar
Yee, H.K.C. and Green, R.F. 1987, Ap. J., in the press.Google Scholar