Discovery of a large-scale wall in the direction of Abell 22

Kevin Pimbblet, Alastair Edge, Warrick Couch

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Abstract

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, by examining the galaxy distributions both in redshift space and on the colour-magnitude plane, that Abell 22 exhibits a foreground wall-like structure. A search for other galaxies and clusters in the nearby region using the 2dF Galaxy Redshift Survey data base 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 h-1 Mpc in length and 10 h-1 Mpc in width at the redshift of Abell 22.
Original languageEnglish
Pages (from-to)L45 - L49
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume357
Issue number1
DOIs
Publication statusPublished - 2005
Externally publishedYes

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