Largescale bias and the peak background split
Abstract
Dark matter haloes are biased tracers of the underlying dark matter distribution. We use a simple model to provide a relation between the abundance of dark matter haloes and their spatial distribution on large scales. Our model shows that knowledge of the unconditional mass function alone is sufficient to provide an accurate estimate of the largescale bias factor. We then use the mass function measured in numerical simulations of SCDM, OCDM and LambdaCDM to compute this bias. Comparison with these simulations shows that this simple way of estimating the bias relation and its evolution is accurate for less massive haloes as well as massive ones. In particular, we show that haloes that are less/more massive than typical M_* haloes at the time they form are more/less strongly clustered than is predicted by formulae based on the standard PressSchechter mass function.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 September 1999
 DOI:
 10.1046/j.13658711.1999.02692.x
 arXiv:
 arXiv:astroph/9901122
 Bibcode:
 1999MNRAS.308..119S
 Keywords:

 Astrophysics
 EPrint:
 8 pages, 6 figures, submitted to MNRAS corrected ylabel for fig.4 (newlabel = 1 + oldlabel)