Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233..637c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, Aug. 1, 1988, p. 637-648.
Astronomy and Astrophysics
Astronomy
153
Cosmology, Dark Matter, Galactic Clusters, Gas Temperature, Mass Spectra, Microwaves, Maps, Power Spectra, Simulation
Scientific paper
In the context of the cold dark matter cosmology, the Delta-T/T fluctuations induced in the microwave background radiation by the hot gas confined by the dark matter potential wells, via the Sunyaev-Zel'dovich effect, are calculated. The fluctuations should be dominated by the rare massive clusters at moderate redshifts, and this motivates a simple modelling in which the form of the model clusters is chosen to mimic real clusters, but the evolution of the cluster population derives from the theory. The clusters produce a characteristic non-Gaussian field, with (Delta-T/T)rms of about 0.00001 for an angular scale of around a few arcminutes. The amplitude of (Delta-T/T)rms depends sensitively on the adopted normalization and of the assumed gas fraction. The variation of (Delta-T/T)rms with angular scale is slow and is insensitive to this normalization. Clustering of clusters is included in the analysis. Simulated sky maps are shown, and from these the distribution function for the fluctuations is deduced.
Cole Shaun
Kaiser Nick
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