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Detection of the effect of cosmological large-scale structure on the orientation of galaxies

Ignacio Trujillo·Conrado Carretero·Santiago G. Patiri
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Abstract

Galaxies are not distributed randomly throughout space but are instead arranged in an intricate "cosmic web" of filaments and walls surrounding bubble-like voids. There is still no compelling observational evidence of a link between the structure of the cosmic web and how galaxies form within it. However, such a connection is expected on the basis of our understanding of the origin of galaxy angular momentum: disk galaxies should be highly inclined relative to the plane defined by the large-scale structure surrounding them. Using the two largest galaxy redshift surveys currently in existence (2dFGRS and SDSS) we show at the 99.7% confident level that these alignments do indeed exist: spiral galaxies located on the shells of the largest cosmic voids have rotation axes that lie preferentially on the void surface.

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Ignacio Trujillo, Conrado Carretero, Santiago G. Patiri. 2006-02-20. Detection of the effect of cosmological large-scale structure on the orientation of galaxies. https://doi.org/10.1086/503548

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