Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-07
Phys.Rev. D63 (2001) 063001
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures + 3 color plates, submitted to PRD; movies and additional information available at http://feynman.prince
Scientific paper
10.1103/PhysRevD.63.063001
We use moving mesh hydrodynamical simulations to make maps of Sunyaev-Zeldovich effect. We present these maps for several cosmological models and explore their lowest moments. We find that the first moment, the mean Compton $y$ parameter, is typically between $1-2\times 10^{-6}$ for cluster abundance normalized models, the lower value corresponding to the high density models, and scales as $\sigma_8^{3-4}$. Rms fluctuations at 10' scale have an amplitude $ \Delta T/T \sim 1-3 \times 10^{-6}$ in the Rayleigh-Jeans regime. The amplitude of the power spectrum strongly depends on the power spectrum normalization and scales as $\sigma_8^{6-9}$. On smaller scales ($l>1000$) the spectrum is dominated by halos below $10^{13}M_{\sun}$ and so is sensitive to the thermal history of galactic halo gas. On larger scales ($l<1000$) the power spectrum is less sensitive to nongravitational energy injection, but becomes very noisy, with large field to field variations in the power spectrum caused by rare bright sources in the maps, which dominate in the spectrum over the large scale structure correlations. Cross-correlation power spectrum with weak lensing or projected galaxy distribution is significant and the cross-correlation coefficient is around 0.5 over a wide range of scales. Comparison with Press-Schechter predictions gives very good agreement for all the statistics, indicating that there is no significant contribution to SZ from non-virialized structures. The one point distribution function shows clear deviations from gaussianity and can be well-approximated as log-normal on small scales.
Burwell Juan
Pen U.-L.
Seljak Uros
No associations
LandOfFree
Sunyaev-Zeldovich effect from hydrodynamical simulations: maps and low order statistics 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 Sunyaev-Zeldovich effect from hydrodynamical simulations: maps and low order statistics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sunyaev-Zeldovich effect from hydrodynamical simulations: maps and low order statistics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-720064