Galaxy Zoo: The large-scale spin statistics of spiral galaxies in the Sloan Digital Sky Survey

Details Galaxy Zoo: The large-scale spin statistics of spiral galaxies in the Sloan Digital Sky Survey Galaxy Zoo: The large-scale spin statistics of spiral galaxies in the Sloan Digital Sky Survey

2008-03-22

arxiv.org/abs/0803.3247v4

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 8 pages, 5 figures

Scientific paper

10.1111/j.1365-2966.2008.13490.x

We re-examine the evidence for a violation of large-scale statistical isotropy in the distribution of projected spin vectors of spiral galaxies. We have a sample of $\sim 37,000$ spiral galaxies from the Sloan Digital Sky Survey, with their line of sight spin direction confidently classified by members of the public through the online project Galaxy Zoo. After establishing and correcting for a certain level of bias in our handedness results we find the winding sense of the galaxies to be consistent with statistical isotropy. In particular we find no significant dipole signal, and thus no evidence for overall preferred handedness of the Universe. We compare this result to those of other authors and conclude that these may also be affected and explained by a bias effect.

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