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A galaxy's orientation is one of its most basic observable properties.Astronomers once assumed that galaxies are randomly oriented in space, howeverit is now clear that some have preferred orientations with respect to theirsurroundings. Chief among these are giant elliptical galaxies found in thecenters of rich galaxy clusters. Numerous studies have shown that the majoraxes of these galaxies often share the same orientation as the surroundingmatter distribution on larger scales. Using Hubble Space Telescope observationsof 65 distant galaxy clusters, we show for the first time that similaralignments are seen at earlier epochs when the universe was only one-third itscurrent age. These results suggest that the brightest galaxies in clusters arethe product of a special formation history, one influenced by development ofthe cosmic web over billions of years.

Ten Billion Years of Brightest Cluster Galaxy Alignments