Comments on the expected isotropic distribution curves in galaxy orientation studies

Details Comments on the expected isotropic distribution curves in galaxy orientation studies Comments on the expected isotropic distribution curves in galaxy orientation studies

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...364l..97a&link_type=abstract

Astronomy and Astrophysics, v.364, p.L97-L100 (2000)

Astronomy and Astrophysics

Astrophysics

17

Gamma Rays: Observations, Stars: Pulsars: General, Stars: Supernovae: General

Scientific paper

We present results of random simulations for the expected isotropic distributions of the polar and azimuthal angles of galaxy rotation axes. It is found that selection effects concerning position and inclination of galaxies can remarkably change the shape of these distributions. Selection effects of this kind may play an important role when galaxies are taken from an incomplete dataset (e.g. from a limited region of the sky). These effects can lead to artificial structures (and hence to misinterpretations, as it already happened in the literature) and should be taken into account when deciding upon isotropy or anisotropy in the spatial distribution of spin vectors of galaxies. In this paper we discuss the various effects of selection.

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