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Astrophysics

Title: Lyman Alpha Absorber Correlations and the Bias of the Lyman Alpha Forest

Abstract: Lyman alpha absorber correlations contain information about the underlying density distribution associated with a particular class of absorbers. As such, they provide an opportunity to independently measure the "bias" of the Lyman alpha forest, i.e. the relationship between HI column density and underlying dark matter density. In these proceedings we use hydrodynamic simulations to investigate whether the evolution of this bias is measurable from observable correlations. Unfortunately, the increasingly complex physics in the IGM at z<1 makes a direct measurement of the bias difficult. Nevertheless, current simulations do make predictions for HI absorber correlations that are in broad agreement with observations at both high and low redshift, thus reinforcing the bias evolution predictions given by these models.
Comments: 6 pages, to appear in "The IGM/Galaxy Connection: The Distribution of Baryons at z=0", eds. J. L. Rosenberg and M. E. Putman
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0212395v1

Submission history

From: Romeel Dave' [view email]
[v1] Tue, 17 Dec 2002 23:06:02 GMT (59kb)