Baryon oscillations in galaxy and matter power-spectrum covariance matrices

Simple item page
dc.creatorNeyrinck, Mark C.
dc.creatorSzapudi, István
dc.date2007-10-19
dc.date2007-12-04
dc.date.accessioned2026-07-07T09:23:41Z
dc.date.available2026-07-07T09:23:41Z
dc.descriptionWe 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.
dc.description11 pages, 11 figures, accepted to MNRAS. Minor changes to match accepted version. CosmoPy (Cosmological Python) code available at http://ifa.hawaii.edu/cosmopy/
dc.identifierhttps://arxiv.org/abs/0710.3586
dc.identifierhttp://arxiv.org/abs/0710.3586
dc.identifierMon.Not.Roy.Astron.Soc. 384 (2008) 1221-1230
dc.identifierdoi:10.1111/j.1365-2966.2007.12803.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/155820
dc.subjectAstrophysics
dc.titleBaryon oscillations in galaxy and matter power-spectrum covariance matrices
dc.typetext

Files

Collections

arXiv