Detection of the Effect of Cosmological Large-Scale Structure on the Orientation of Galaxies

Trujillo, I.; Carretero, Conrado; Patiri, Santiago G.
Referencia bibliográfica

The Astrophysical Journal, Volume 640, Issue 2, pp. L111-L114.

Fecha de publicación:
4
2006
Número de autores
3
Número de autores del IAC
2
Número de citas
111
Número de citas referidas
99
Descripción
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% confidence 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.