Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21530603b&link_type=abstract
American Astronomical Society, AAS Meeting #215, #306.03; Bulletin of the American Astronomical Society, Vol. 42, p.303
Astronomy and Astrophysics
Astronomy
Scientific paper
Redshift space distortions, or the effect of gravitationally induced peculiar velocities on the apparent distance to objects when that distance is measured by redshift, presents both a complication to the measurement of baryon oscillations and an opportunity to further insight into the expansion history of the universe. I have used the Dark Matter simulations of Daniel Eizenstein to do a basic modeling of how a near full sky spectroscopic galaxy survey could measure the beta parameter (growth rate over tracer bias). Preliminary results suggest that cosmic variance will be a major limiting factor in this measurement, but that a broad enough survey should be able to yield measurements of beta in on the order of ten redshift bins up to redshift of two. An interesting empirical observation of this study is that, when beta is measured as a function of correlation length r for a given redshift, redshift measurement errors and perhaps non-linear effects distort shift beta by a value proportional to r-9/4.
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