Secondary Microwave Background Anisotropies Induced by Pancakes

Details Secondary Microwave Background Anisotropies Induced by Pancakes Secondary Microwave Background Anisotropies Induced by Pancakes

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..897c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 4/FEB15, P. 897, 1994

Astronomy and Astrophysics

Astronomy

7

Scientific paper

A non-linear, flattened cosmic structure is modelled as an extremely oblate, homogeneous, `compensated' ellipsoid. An analytical formula is derived for the amplitude of the fractional secondary anisotropy ({DELTA} T/T) induced in the cosmic microwave background by the gravitational evolution of such a structure. This formula turns out to be a simple generalization of the corresponding result calculated previously in the model of a thin collapsing `compensated disc'. Earlier results for {DELTA} T/T induced by pancakes are confirmed here. The compensation scheme fails for perturbations such as the Great Wall in the CfA survey. Nevertheless, it can be used to put a reliable upper limit on the anisotropy induced by the Great Wall, ({DELTA} T/T)_GW_. The calculated value is ({DELTA} T/T)_GW_<~ 2 x 10^-6^, which is below the accuracy of present-day observations.

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