Astrophysics and Space Science

, Volume 126, Issue 2, pp 301–312 | Cite as

The evolution of quasars selected by slitless technique

  • Deng Zu-Gan
  • Zhou You-Yuan
  • Liu Yong-Zhen
  • Dai He-Jun


In former works (Zhouet al., 1983, 1985), a quantitative method have been developed to take the selection effects in the identification of emission lines of quasars into account. It was proved that these selection effects may be the cause of the unevenness in the redshift distribution of quasars. The present work is a continuation and development of former works. We use results given by the surveys with same limit-apparent magnitude and choose the quasars whose absolute magnitudes are within a specific range as the analysing samples. Using the method given in the former papers we may find out the evolutionary parameter γ in an evolutionary law with form of (1+z) y from the best fitting between the calculative and observational redshift distribution. The result of analysis shows that the evolutionary law of quasars selected by slitless technique isp =p0(1 + z)6.5 ± 1 up toz=2.8. This result coincides with and generalizes the earlier result given by other authors.


Analyse Sample Early Result Emission Line Quantitative Method Selection Effect 
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Copyright information

© D. Reidel Publishing Company 1986

Authors and Affiliations

  • Deng Zu-Gan
    • 1
  • Zhou You-Yuan
    • 2
  • Liu Yong-Zhen
    • 3
  • Dai He-Jun
    • 4
  1. 1.Department of Physics, Graduate SchoolAcademia SinicaBeijingChina
  2. 2.Center of AstrophysicsUniversity of Science and Technology of ChinaHefeiChina
  3. 3.Department of Physics, Graduate SchoolAcademia SinicaBeijingChina
  4. 4.Department of PhysicsHarbin Institute of TechnologyHarbinChina

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