Evolution of Structure in the Lyman-alpha Forest

Details Evolution of Structure in the Lyman-alpha Forest Evolution of Structure in the Lyman-alpha Forest

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.9704b&link_type=abstract

American Astronomical Society Meeting 203, #97.04; Bulletin of the American Astronomical Society, Vol. 35, p.1366

Mathematics

Probability

Scientific paper

Using a sample of 3376 quasar spectra from the Sloan Digital Sky Survey (SDSS) we measure the probability distribution of flux in the Lyman-alpha forest as a function of redshift. This distribution is then compared with distributions generated from models that assume photoionization equilibrium and an underlying lognormal density. We find that the lognormal model underpredicts the probability of high optical depth systems in the Lyman-alpha forest but is an extremely good fit at lower optical depths. This measurement depends critically on a proper characterization of the noise in the SDSS spectra.

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