Line versus Flux Statistics -- Considerations for the Low Redshift Lyman-alpha Forest

Details Line versus Flux Statistics -- Considerations for the Low Redshift Lyman-alpha Forest Line versus Flux Statistics -- Considerations for the Low Redshift Lyman-alpha Forest

2003-01-16

arxiv.org/abs/astro-ph/0301313v1

Astronomy and Astrophysics

Astrophysics

6 pages, to appear in "The IGM/Galaxy Connection: The Distribution of Baryons at z=0", eds. J. L. Rosenberg and M. E. Putman

Scientific paper

The flux/transmission power spectrum has become a popular statistical tool in studies of the high redshift ($z > 2$) Lyman-alpha forest. At low redshifts, where the forest has thinned out into a series of well-isolated absorption lines, the motivation for flux statistics is less obvious. Here, we study the relative merits of flux versus line correlations, and derive a simple condition under which one is favored over the other on purely statistical grounds. Systematic errors probably play an important role in this discussion, and they are outlined as well.

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