Typical scales in the distribution of QSOs
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**Session 62 -- Large Scale Structures**
*Display presentation, Thursday, 2, 1994, 10:00-11:30*

## [62.10] Typical scales in the distribution of QSOs

*Li-Zhi Fang, Zu-Gan Deng (Univ. of Arizona), Xiao-Yang Xia (Tianjing Normal Univ., P.R.China)*

We present results of searching for the possible typical scales in the
spatial distribution of QSOs. Our method is based on the second
derivative of the two-point correlation function. This statistic
is sensitive to the scale of the maximum in the spectrum $P(k)$ of the
density perturbation in the universe. This maximum or bend scale can be
detected as the wavelengths of the periodic component in the second
derivative of the integral correlation function. For various QSO samples
compiled from surveys of pencil-beam and bright QSOs, a typical scale of
about 93 $\pm$ 10 h$^{-1}$Mpc for $q_0=0.5$ has been detected.
This typical scale is in good agreement with that found in the spatial
distributions of galaxies, clusters of galaxies, and CIV absorption
systems of QSOs if $q_0$ is taken to be $\sim 0.2$. Therefore, it is likely
a common or universal scale in the large scale structure traced by these
objects. This result is consistent with the assumption that the typical
scale comes from a characteristic scale in the spectrum of the density
perturbation in the universe.

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