Decomposition of Spectra from Redshift Distortion Maps

Details Decomposition of Spectra from Redshift Distortion Maps Decomposition of Spectra from Redshift Distortion Maps

2010-03-11

arxiv.org/abs/1003.2420v1

Monthly Notices of the Royal Astronomical Society, Volume 407, Issue 2, pp. 1123-1127, 2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages and 4 figures, submitted to MNRAS

Scientific paper

10.1111/j.1365-2966.2010.16955.x

We develop an optimized technique to extract density--density and velocity--velocity spectra out of observed spectra in redshift space. The measured spectra of the distribution of halos from redshift distorted mock map are binned into 2--dimensional coordinates in Fourier space so as to be decomposed into both spectra using angular projection dependence. With the threshold limit introduced to minimize nonlinear suppression, the decomposed velocity--velocity spectra are reasonably well measured up to scale k=0.07 h/Mpc, and the measured variances using our method are consistent with errors predicted from a Fisher matrix analysis. The detectability is extendable to k\sim 0.1 h/Mpc with more conservative bounds at the cost of weakened constraint.

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