Max Tegmark's library: bias
Figure1: time-evolution of the bias factor and the correlation
betweeen mass and light.
Please click here to get the 660K postscript file
with the paper. Click
if you are interested in other research of mine.
The time-evolution of bias
Max Tegmark & P.
J. E. Peebles
We study the evolution of the bias factor b and the mass-galaxy correlation
coefficient r in a simple analytic model for galaxy formation and the gravitational
growth of clustering. The model shows that b and r can be strongly time-dependent,
but tend to approach unity even if galaxy formation never ends as the gravitational
growth of clustering debiases the older galaxies. The presence of random
fluctuations in the sites of galaxy formation relative to the mass distribution
can cause large and rapidly falling bias values at high redshift.
ApJL, 500, 79-82 (1998)
Bias and beyond
This is a more general essay on bias and can be downloaded by clicking
It is becoming increasingly clear that galaxy bias is complicated, with
evidence indicating that it can be time-dependent, morphology-dependent,
scale-dependent, non-linear and non-deterministic. We discuss strategies
for overcoming these complications and performing precision cosmological
tests with upcoming redshift surveys.
To appear in ``The Projected Power Spectrum of the Dark Matter Inferred
from Weak Lensing Surveys'', S. Colombi and Y. Mellier (eds), Editions
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This page was last modified September 15, 1998.