The Sunyaev-Zel'dovich effect  

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Image 1: Simulated kinetic SZ map (created by Naoki Yoshida and Antonaldo Diaferio)

This picture is created by projecting our simulation box [see Very Large Simulations] (480Mpc/h on a side) in one direction on a 2400 x 2400 grid. We assume that baryons trace the dark matter, i.e. baryon densities and peculiar velocities are proportional to those of the dark matter. The colours show the CMB temperature fluctuationss with white denoting approaching material and black receding material. Clusters and superclusters in formation are clearly visible.

Image 2: Stacked kinetic SZ map, 3.4 x 3.4 degree2 field

To make a realistic sky map, we stack simulation boxes in a line extending to high redshift. The simulation [see Higher Resolution Simulations in Smaller Boxes] outputs at 14 different redshifts between 0 and 10 are arranged such that they fit together and fill in the volume of a past lightcone of the observer. We select an area of one degree on a side. The map is made with 2048 x 2048 pixels, corresponding to an angular resolution of 0.1 arcminute. Fractional temperature variations delta T/T is shown in a linearly scaled grey color.


Image 3: Stacked thermal SZ map

As for Image 2, but for the thermal effect. The grey scale is logarithmic for this picture.


Simulation parameterstop

Please see Very Large Simulations.


Superclusters with Thermal SZ effect surveys
A. Diaferio, A. Nusser, N. Yoshida, R. A. Sunyaev, 2003, MNRAS, 338, 433

Non-Gaussian CMB Temperature Fluctuations from Peculiar Velocities of Clusters
N. Yoshida, R. Sheth, and A. Diaferio, 2001, MNRAS, 328, 669

Large-Scale Motions in Superclusters: their imprint in the cosmic microwave background
A. Diaferio, R. A. Sunyaev, A. Nusser, 2000, ApJ, 533, L71


Here is an example of proper credit for these Virgo data.
"The simulations in this paper were carried out by the Virgo Supercomputing Consortium using computers based at Computing Centre of the Max-Planck Society in Garching and at the Edinburgh Parallel Computing Centre. The data are publicly available at"

Comments to: N. Yoshida naoki@mpa-garching.mpg.detop