Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-19
Mon.Not.Roy.Astron.Soc. 384 (2008) 1221-1230
Astronomy and Astrophysics
Astrophysics
11 pages, 11 figures, accepted to MNRAS. Minor changes to match accepted version. CosmoPy (Cosmological Python) code available
Scientific paper
10.1111/j.1365-2966.2007.12803.x
We investigate large-amplitude baryon acoustic oscillations (BAO's) in off-diagonal entries of cosmological power-spectrum covariance matrices. These covariance-matrix BAO's describe the increased attenuation of power-spectrum BAO's caused by upward fluctuations in large-scale power. We derive an analytic approximation to covariance-matrix entries in the BAO regime, and check the analytical predictions using N-body simulations. These BAO's look much stronger than the BAO's in the power spectrum, but seem detectable only at about a one-sigma level in gigaparsec-scale galaxy surveys. In estimating cosmological parameters using matter or galaxy power spectra, including the covariance-matrix BAO's can have a several-percent effect on error-bar widths for some parameters directly related to the BAO's, such as the baryon fraction. Also, we find that including the numerous galaxies in small haloes in a survey can reduce error bars in these cosmological parameters more than the simple reduction in shot noise might suggest.
Neyrinck Mark C.
Szapudi István
No associations
LandOfFree
Baryon oscillations in galaxy and matter power-spectrum covariance matrices does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Baryon oscillations in galaxy and matter power-spectrum covariance matrices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Baryon oscillations in galaxy and matter power-spectrum covariance matrices will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-708217