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The Bull's-Eye Effect: Are Galaxy Walls Observationally Enhanced?

Elizabeth. A. Praton·Adrian L. Melott·Margaret Q. McKee
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Abstract

We investigate a distortion in redshift-space which causes galaxies to appear to lie in walls concentric about the observer, forming a rough bull's-eye pattern. We simulate what an observer would see in a thin slice of redshift-space, including a magnitude limit and constant slice angle. The result is an enhanced ring of galaxies encircling the observer at a distance roughly corresponding to the peak of the selection function. This ring is an artificial enhancement of weak features in real-space. This may explain visually prominent features such as the ``Great Wall'' and periodicity found in deep narrow fields.

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Elizabeth. A. Praton, Adrian L. Melott, Margaret Q. McKee. 1997-01-09. The Bull's-Eye Effect: Are Galaxy Walls Observationally Enhanced?. https://doi.org/10.1086/310567

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