Discovery of a Large-scale Wall in the Direction of Abell 22

Details Discovery of a Large-scale Wall in the Direction of Abell 22 Discovery of a Large-scale Wall in the Direction of Abell 22

2004-12-03

arxiv.org/abs/astro-ph/0412076v1

Mon.Not.Roy.Astron.Soc. 357 (2005) L45

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, accepted for publication in MNRAS letters

Scientific paper

10.1111/j.1745-3933.2005.00015.x

We report on the discovery of a large-scale wall in the direction of Abell 22. Using photometric and spectroscopic data from the Las Campanas Observatory and Anglo-Australian Telescope Rich Cluster Survey, Abell 22 is found to exhibit a highly unusual and striking redshift distribution. We show that Abell 22 exhibits a foreground wall-like structure by examining the galaxy distributions in both redshift space and on the colour-magnitude plane. A search for other galaxies and clusters in the nearby region using the 2dF Galaxy Redshift Survey database suggests that the wall-like structure is a significant large-scale, non-virialized filament which runs between two other Abell clusters either side of Abell 22. The filament stretches over at least >40 Mpc in length and 10 Mpc in width at the redshift of Abell 22.

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