The evolution of quasars selected by slitless technique |
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Authors: | Deng Zu-Gan Zhou You-Yuan Liu Yong-Zhen Dai He-Jun |
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Institution: | (1) Department of Physics, Graduate School, Academia Sinica, Beijing, China;(2) Center of Astrophysics, University of Science and Technology of China, Hefei, China;(3) Department of Physics, Graduate School, Academia Sinica, Beijing, China;(4) Department of Physics, Harbin Institute of Technology, Harbin, China |
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Abstract: | 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 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 =p
0(1 + z)6.5 ± 1 up toz=2.8. This result coincides with and generalizes the earlier result given by other authors. |
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