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Title: Constraints on structure formation models from the Sunyaev-Zel'dovich effect
Authors: Majumdar, Subhabrata
Subrahmanyan, Ravi
Issue Date: Mar-2000
Publisher: Blackwell Publishing for the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2000, Vol.312, p724-732.
Abstract: In the context of cold dark matter (CDM) cosmological models, we have simulated images of the brightness temperature fluctuations in the cosmic microwave background (CMB) sky owing to the Sunyaev-Zel'dovich (S-Z) effect in a cosmological distribution of clusters. We compare the image statistics with recent ATCA limits on arcmin-scale CMB anisotropy. The S-Z effect produces a generically non-Gaussian field and we compute the variance in the simulated temperature-anisotropy images, after convolution with the ATCA beam pattern, for different cosmological models. All the models are normalized to the 4-yr COBE data. We find an increase in the simulated-sky temperature variance with increase in the cosmological density parameter Ω0. A comparison with the upper limits on the sky variance set by the ATCA appears to rule out our closed-universe model: low-Ω0 open-universe models are preferred. The result is independent of any present day observations of σ8.
Description: Restricted Access. An open access version is available at NASA ADS (alternative location).
ISSN: 0035-8711
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Copyright: (2000) Blackwell Publishing for the Royal Astronomical Society
Appears in Collections:Research Papers (A&A)

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