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Constraints on structure formation models from the sunyaev- zel'dovich effect

Majumdar, Subhabrata and Subrahmanyan, Ravi (2000) Constraints on structure formation models from the sunyaev- zel'dovich effect. In: Monthly Notices of the Royal Astronomical Society, 312 (4). pp. 724-732.

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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-Zeldovich (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 Omega(0). A comparison with the upper limits on the sky variance set by the ATCA appears to rule out our closed- universe model: low-Omega(0) open-universe models are preferred. The result is independent of any present day observations of sigma(8).

Item Type: Journal Article
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Additional Information: Copyright for this article belongs to Blackwell Science.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 17 Sep 2004
Last Modified: 27 Aug 2008 11:07
URI: http://eprints.iisc.ernet.in/id/eprint/1791

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