The Large Scale Inhomogeneous Distribution of Ly-Alpha Absorption Lines in the Spectra of Quasars

  • Yaoquan Chu
  • Xingfen Zhu
Conference paper


Using a quite resonable homogeneous sample of Ly-alpha absorption lines in quasars spectra, we find some evidence for existence of very large scale inhomogeneity in distribution of Ly-alpha absorption line redshifts. We find a significant peak at Z~v2.9 in the histogram of redshift distribution. The power-spectrum analysis shows that a periodic component at the length of 0.2 for the argument x=1n(1+z). The significance of confidence is not very high, about 83%, but the length of periods is just the same as for the periodicity of emission line redshifts of quasars. Moreover, the ratio R=(1+Zem)/(1+Zab) for Ly-alpha absorption lines also shows several peaks in its distribution which is in good agreement with the prediction if the periodicity exists in both emission line and absorption line redshifts.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • Yaoquan Chu
    • 1
    • 2
  • Xingfen Zhu
    • 1
    • 2
  1. 1.Institute for AstrophysicsUniversity of BonnFed.Rep.of Germany
  2. 2.Center for AstrophysicsUniversity of Science and Technology of ChinaHefeiPeople’s Republic of China

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