Microwave background fluctuations due to the Sunyaev-Zel'dovich effects in pancakes

Details Microwave background fluctuations due to the Sunyaev-Zel'dovich effects in pancakes Microwave background fluctuations due to the Sunyaev-Zel'dovich effects in pancakes

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..474s&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 2, p. 474-483

Astronomy and Astrophysics

Astronomy

9

Background Radiation, Computerized Simulation, Cosmic Rays, Cosmology, Microwaves, Variations, Cooling, Data Smoothing, Molecular Clouds, Random Noise, Sky Surveys (Astronomy)

Scientific paper

We calculate distortions in the microwave background radiation from the Sunyaev-Zel'dovich effect, produced by hot gas in large (approximately 100 Mpc) pancakes. The large-scale distribution of the pancakes is taken to be that of a Voronoi foam. Fluctuations for this scenario are estimated to be on the order of delta T/T is approximately 10-5. Using computer simulations, we produce several 32 deg x 32 deg images with 0.25 deg resolution. These images show characteristic linear features produced when a pancake is viewed nearly edge-on. By calculating the two-point and the degenerate three-point correlation functions, we are able to statistically detect such non-Gaussian features even in the presence of a relatively large amount of Gaussian noise. The degenerate three-point correlation function is found to be particularly useful since it is insensitive to correlated Gaussian noise. We also smooth our data over a 7 deg Full Width at Half Maximum (FWHM) Gaussian window to simulate the Cosmic Background Explorer Satellite (COBE) observations. We find that under such low-resolution conditions, the features are highly suppressed.

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