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Distribution of the extensive Doppler redshift of quasars.pdf

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Distribution of the extensive Doppler redshift of quasars

a r X i v : a s t r o - p h / 0 4 0 8 5 4 6 v 1 3 0 A u g 2 0 0 4 Distribution of the extensive Doppler redshift of quasars Yi-Ping Qin1,2, Hong-Tao Liu1,3, En-Wei Liang 1,2, Yun-Ming Dong1,3 and Cheng-Yue Su1,3,4 1National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming, Yunnan, 650011, P. R. China 2Physics Department, Guangxi University, Nanning, Guangxi, 530004, P. R. China 3 The Graduate School of the Chinese Academy of Sciences 4 Department of Physics, Guangdong Industrial University, Guangzhou, Guangdong, 510643, P. R. China Abstract We make an analysis of the distribution of the extensive Doppler redshift defined as z?Dopp = (zabs ? zem)/(1+ zem) with a sample of 1317 absorption redshifts available from 401 quasars. The analysis reveals a bi-peak structure in the distribution, with one component located at z?Dopp ? 0.00 and the other at z?Dopp ? ?0.01. A study of some possible causes suggests that the structure can be well interpreted: while the absorbers inside the same cluster as the quasar concerned could contribute to the first component and the less populated space between clusters could explain the gap between the two peaks, the typical distance between clusters could account for the second component. If the bi-peak structure is true, which needs to be confirmed by complete samples, one would be able to obtain some useful cosmological information. Key words: cosmology: observations — galaxies: distances and redshifts — quasars: absorption lines — quasars: emission lines 1 Introduction Emission redshifts of quasars are believed to be of cosmological origin. Absorption redshifts of the objects must be produced by the absorbers in front of them along the line of sight. In fact, the Lyman-limit systems (Tytler 1982) are clearly due to intervening gas that is unassociated with the 1 quasars since they usually appear at redshifts significantly less than the corresponding emission redshifts. The damped Ly