Two Ways of Biasing Galaxy Formation

Details Two Ways of Biasing Galaxy Formation Two Ways of Biasing Galaxy Formation

2000-05-26

arxiv.org/abs/astro-ph/0005544v2

Mon.Not.Roy.Astron.Soc. 318 (2000) 39

Astronomy and Astrophysics

Astrophysics

6 pages, added one figure and revised; MNRAS Pink Pages (in press), Latex file uses mn.sty

Scientific paper

10.1046/j.1365-8711.2000.04023.x

We calculate the galaxy bispectrum in both real and redshift space adopting the most common prescriptions for local Eulerian biasing and Lagrangian evolving-bias model. We show that the two biasing schemes make measurably different predictions for these clustering statistics. The Eulerian prescription implies that the galaxy distribution depends only on the present-day local mass distribution, while its Lagrangian counterpart relates the current galaxy distribution to the mass distribution at an earlier epoch when galaxies first formed. Detailed measurement of the galaxy bispectrum (of its reduced amplitude) can help establish whether galaxy positions are determined by the current mass distribution or an earlier mass distribution.

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